MEGABIT MODEM 310F AND
320F USER MANUAL
Catalog Number
MMD4067I2 Issue 2
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About This Manual
ABOUT THIS MANUAL
This manual is intended to help a network administrator install and configure the ADC®
Megabit Modem 310F and 320F for use in a private network environment. It includes:
•
•
•
•
•
a summary of the modem features and suggested applications
instructions for installing and configuring the modems
explanation of the performance monitoring screens
technical specifications and cabling pinouts
a glossary
DOCUMENT CONVENTIONS
Two types of messages, identified by icons, are used throughout the document:
Notes contain information about special circumstances.
Cautions indicate the possibility of equipment damage or the possibility of
personal injury.
PRODUCT CERTIFICATIONS
FCC
Megabit Modem
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used
in accordance with this instruction manual, may cause harmful interference to radio
communication.
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iii
Product Certifications
However, there is no guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
•
•
•
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver
is connected.
•
Consult the dealer or an experienced radio/TV technician for help.
cUL
This product meets all safety requirements per UL-1950 standard.
iv
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Table of Contents
Features................................................................................................................................1
Applications.........................................................................................................................2
Chapter 2: Installing the Megabit Modem 310F and 320F..................................................3
Unpacking and Inspecting the Shipment.............................................................................3
Attaching the Feet................................................................................................................4
Identifying The Connectors.................................................................................................5
Installing the Cabling ..........................................................................................................6
Identifying LEDs.................................................................................................................7
Powering Up and Checking LEDs ......................................................................................8
Chapter 3: Preparing for Configuration and Management ................................................9
Connecting a Terminal ........................................................................................................9
Configuring the Terminal..................................................................................................10
Logging On and Navigating the Interface.........................................................................10
Logging On to the Local Modem........................................................................10
Logging On to the Remote Modem ....................................................................12
Navigating the Interface......................................................................................13
Logging Off.......................................................................................................................14
Chapter 4: Configuring the Modems...................................................................................15
Setting System Configurations..........................................................................................15
Changing the System Time .................................................................................16
Changing the System Date..................................................................................16
Changing the Logon Password............................................................................17
Restoring Factory Default Settings .....................................................................18
Disabling or Enabling the RS-232 Port For the Megabit Modem 320F .............19
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Table of Contents
Configuring Data Rates.......................................................................................22
Configuring the Interleave Options.....................................................................25
Saving ADSL Configuration Changes ................................................................25
Resetting the ADSL Link....................................................................................26
Monitoring ADSL Status...................................................................................................31
Monitoring ADSL Performance Status ...............................................................32
Displaying System Information.........................................................................................41
MAC Layer Bridging.........................................................................................................43
Data Encapsulation ............................................................................................................43
Ethernet Frame Rates.........................................................................................................44
Minimum xDSL Bit Stuffing, One Additional Bit..............................................44
Maximum xDSL Bit Stuffing, Zero Additional Bits...........................................46
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Rate Adaptive Transmission..............................................................................................47
Rate Adaptation...................................................................................................48
Technical Specifications....................................................................................................51
Compliance........................................................................................................................52
Connector Pinouts .............................................................................................................53
Limited Warranty ..............................................................................................................56
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Table of Contents
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MEGABIT MODEM 310F AND 320F
FEATURES AND APPLICATIONS
1
The ADC® Megabit Modem® 310F and 320F use Asymmetric Digital Subscriber Line (ADSL)
technology to provide a multi-megabit connection between the two modems using a single-pair
telephone line. The Megabit Modem 310F and 320F are designed to be used together, one at
each end of a circuit, with the model 310F functioning as the ATU-C and the model 320F
functioning as the ATU-R. The Megabit Modem 310F and 320F use Discrete MultiTone (DMT)
line coding. In addition, ADSL technology allows POTS (Plain Old Telephone Service) to
coexist with the high-speed data service on the same wire pair.
The Megabit Modem 310F and 320F support the full DMT rate of 64 kbps to 7040 kbps
downstream and 64 kbps to 928 kbps upstream. The Megabit Modem 310F and 320F can be
used in either rate adaptive mode, in which the modem speed automatically adjusts to the
maximum attainable data rate depending on distance and line condition, or you can select
a fixed rate.
FEATURES
Megabit Modem 310F and 320F features include:
•
•
•
•
10BASE-T Ethernet port for LAN connection
ADSL port for ADSL connection
IEEE 802.1d transparent MAC layer bridging of frames received on the LAN port
full DMT transmission rates
–
–
64 kbps to 7040 kbps downstream
64 kbps to 928 kbps upstream
•
RS-232 port for management
The Spanning Tree protocol is not supported in the Megabit Modem 310F or 320F.
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Applications
APPLICATIONS
Use the Megabit Modem 310F and 320F for:
•
•
remote access to private networks, for example telecommuting
point-to-point LAN extension, for example connecting multiple users at a satellite office
to a corporate office LAN
Telecommuting Application
Corporate office
Service Provider
Home office
Local User
320F Modem
320F Modem
310F
Router
310F
Ethernet LAN
ADSL
ADSL
LAN Extension Application
Corporate office
Satellite office
Ethernet LAN
320F Modem
310F Modem
Ethernet LAN
ADSL
2
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INSTALLING THE MEGABIT
MODEM 310F AND 320F
2
Install a Megabit Modem 310F (ATU-C) at one end of a circuit and a Megabit Modem 320F at
the other end (ATU-R), using the procedures described in these sections:
UNPACKING AND INSPECTING THE SHIPMENT
The shipping carton contains the Megabit Modem 310F or 320F, this manual and the items
described on page 4. Upon receipt of the equipment:
1
Unpack each container and visually inspect it for
signs of damage. If the equipment has been damaged
in transit, immediately report the extent of damage to
the transportation company and to your sales
representative. Order replacement equipment if
necessary.
L
I
N
K
T
L
A
N
X
R
X
C
O
L
P
W
R
MEGABIT
S
Y
N
C
MODEM
X S
D
S
L
T
R
X
310F
M
A
R
2
Check the shipment contents against the packing list
to ensure complete and accurate shipment. If the
shipment is short or irregular, contact your sales
representative. If you must store the equipment for a
prolonged period, store the equipment in its original container.
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3
Attaching the Feet
The shipping carton also contains the items described in the following table.
Item
Function
Black cable
Connects the modem Ethernet port to a PC NIC using a straight-through cable.
Connects the modem Ethernet port to a network hub using a crossover cable.
Yellow cable
Gray ADSL cable Connects the modem ADSL port to an RJ-11 wall jack that has DMT ADSL service.
Gray console
Connects the modem RS-232 port to an ASCII terminal or PC running a terminal emulation
cable and adapter program for configuration and management. Cable has RJ-45 connectors. The adapter
converts the RJ-45 port to a DB-9.
Universal power
supply
Provides primary power to the modem and establishes a safety ground. The Megabit
Modem 310F and 320F are available with a variety of power cords. When you order your
modem, choose one of the following as the last number in the product PN (Megabit Modem
310F is PN 150-2103-7x and Megabit Modem 320F is PN 150-2102-7x) to indicate which
power cord you need:
•
•
•
•
2 does not include a power cord
3 includes a North American power cord
4 includes a European power cord.
5 includes a UK/Ireland power cord
Rubber Feet (4)
Attaches to the base of the modem.
ATTACHING THE FEET
Attach four adhesive-backed rubber feet to the footprint recesses on the bottom of the modem.
Rubber feet
Recess
M A R
3 1 0 F
R X
T X
S D S L
M O D E M
S Y N C
M E G A B I T
P W R
C O L
R X
T X
L A N
L I N K
4
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Chapter 2: Installing the Megabit Modem 310F and 320F
IDENTIFYING THE CONNECTORS
All external connectors are located on the Megabit Modem 310F and 320F rear panel. This
section describes the Megabit Modem 310F and 320F rear panel components.
Component
Function
10BASE-T
MDI-X port
RJ-45 port used to connect the modem to the 10BASE-T port of a network hub
or PC NIC.
RS-232 port
RJ-45 port used to connect an ASCII terminal, or PC running a terminal
emulation program, for configuration and management.
DSL port
RJ-11 port used to connect the modem to the ADSL transmission line.
7-pin DIN port that supplies power to the Megabit Modem 310F and 320F.
POWER connector
Connect only the power supply provided to the Megabit Modem
310F or 320F. Using any other power supply could permanently
damage the unit.
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Installing the Cabling
INSTALLING THE CABLING
Use the provided cables as follows:
•
•
•
black cable or yellow cable—connect to 10BASE-T port for Ethernet LAN connection
gray ADSL cable—connect to DSL port for ADSL connection
power supply—connect to power connector
Megabit Modem 310F or 320F
PC, hub or other
network device
10BASE-T port
RS-232 port
DSL port
10BASE-T
Power
connector
RS-232
D
S
L
P
O
W
E
R
Wall RJ-11 jack with ADSL
transmission
To wall
outlet
Do not connect any other power supply to the Megabit Modem 310F or 320F.
If you use another power supply, you could permanently damage the unit.
See “Connector Pinouts” on page 53 for ADSL and 10BASE-T connector pinouts.
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Chapter 2: Installing the Megabit Modem 310F and 320F
IDENTIFYING LEDS
The front panels for both the Megabit Modem 310F and 320F contain LEDs that indicate power
and data transmission status. The following illustrations describe the front panel LEDs.
Off: No current reception
Flashing: Collision detected
Off: No current collision
MEGABIT MODEM 320F
ADSL
RX
LAN
LINK
TX
RX
COL
PWR
SYNC
TX
MAR
Flashing: Transmitting a frame
Off: No current transmission
On: Power is available to the modem
Off: Power is off
On: Network link is up
Off: Link is down
MEGABIT MODEM 320F
ADSL
RX
LAN
LINK
TX
RX
COL
PWR
SYNC
TX
MAR
Flashing: ADSL link dropped
Off: No remote modem detected
On: Link is up
Flashing: Transmitting a frame
Off: No current transmission
Flashing: Receiving a frame
Off: No current reception
On: Margin is at or above configured threshold
Off: Margin is below configured threshold
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Powering Up and Checking LEDs
Powering Up and Checking LEDs
Once you have completed the steps described in the previous sections for both the Megabit
Modem 310F and 320F, you are ready to power up each modem.
1
Plug the Megabit Modem 310F power supply into the facility power and ensure the
Power LED is lit solid green.
2
Plug the Megabit Modem 320F power supply into the facility power and ensure the
Power LED is lit solid green.
3
4
Allow the modems approximately 30 to 60 seconds to synchronize.
After both modems are powered up, verify the following LED indications on each modem:
•
•
10BASE-T LINK LED is solid green (when the Ethernet port is connected)
ADSL SYNC LED is solid green when the Megabit Modem 310F synchronizes with
the Megabit Modem 320F (the LED flashes green when synchronization is lost
between the two modems)
•
ADSL MAR LED is solid green if margin is at or above the configured threshold
If conditions other than those listed above exist, check the cabling. See “Installing the Cabling”
on page 6 for instructions.
8
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PREPARING FOR CONFIGURATION
AND MANAGEMENT
3
You configure the Megabit Modem 310F and 320F using an ASCII terminal or PC running a
terminal emulation program. This chapter provides the set up procedures.
CONNECTING A TERMINAL
Connect the modem to an ASCII terminal or PC running a terminal emulation program:
1
Plug the console adapter into the standard 9-pin COM port on the terminal or PC and
tighten the captive screws until they are snug. (Skip this step if you are using an ASCII
terminal that has an RJ-45 jack.)
2
3
Connect one end of the gray console cable to the adapter or ASCII terminal RJ-45 jack.
Connect the other end of the gray console cable to the modem RS-232 RJ-45 port.
Megabit Modem 310F or 320F
PC
RS-232 port
10BASE-T
RS-232
D
S
L
P
O
W
E
R
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Configuring the Terminal
CONFIGURING THE TERMINAL
Whether you are using an ASCII terminal or PC running a terminal emulation program, such as
Hyperterminal, you must configure the communication settings as indicated in this section,
including designating the connection type and communications port. See your terminal
emulation program or operating system documentation for instructions.
1
Configure these communication settings:
•
•
•
•
•
9600 to 19,200 baud
no parity
8 data bits
1 stop bit
no flow control
2
Set the terminal emulation mode to ANSI.
LOGGING ON AND NAVIGATING THE INTERFACE
Using the management interface, you can manage both the Megabit Modem 310F and 320F.
The header on each screen identifies the modem you are currently managing:
•
•
ATU-C is the Megabit Modem 310F.
ATU-R is the Megabit Modem 320F.
Logging On to the Local Modem
Through the Megabit Modem 310F (ATU-C) System Configuration menu,
you can disable the console port on the Megabit Modem 320F (ATU-R).
Use an ASCII terminal or PC running a terminal emulation program to access
the management interface.
1
Press the SPACEBAR several times to activate the autobaud feature and to display the
Logon Password screen.
10
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Chapter 3: Preparing for Configuration and Management
2
If you have customized your password, type the password at the password prompt.
Otherwise, press ENTER which is the factory default password. (See “Changing the Logon
Password” on page 17 to customize your password.)
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ATU-C ADSL MEGABIT MODEM TERMINAL v 1.0
LOGON PASSWORD>
The Main Menu displays.
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MAIN MENU
1. SYSTEM MENU
2. ADSL MENU
3. BRIDGE MENU
4. REMOTE LOGON
Q. LOGOUT
ENTER CHOICE-->
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Logging On and Navigating the Interface
Logging On to the Remote Modem
From the Megabit Modem 310F (ATU-C), you can log on to the Megabit Modem 320F
(ATU-R) to view system parameters and set configuration options in one of the following ways:
•
•
From the Main Menu on the ATU-C, type 4 and the ATU-R Logon screen displays.
Type CTRL T to toggle from any ATU-C screen and the ATU-R Logon screen displays.
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ATU-C displays
in the header
when logged on
to the Megabit
Modem 310F
MAIN MENU
1. SYSTEM MENU
2. ADSL MENU
3. BRIDGE MENU
4. REMOTE LOGON
Q. LOGOUT
ENTER CHOICE-->
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ATU-R displays
in the header
when logged on
to the Megabit
Modem 320F
LOGON PASSWORD>
Once you log on to both the ATU-C and ATU-R modems, type CTRL T to toggle between the
ATU-C and ATU-R screens to perform configuration or to view status.
When you log on locally to the Megabit Modem 320F, you can view system parameters and set
some configuration options for the Megabit Modem 320F only.
12
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Chapter 3: Preparing for Configuration and Management
Navigating the Interface
The following illustration shows the Megabit Modem 310F and 320F management interface
structure. Select a menu option by typing the number that precedes it.
Logon
Main Menu
System Menu
ADSL Menu
System Information
System Configuration
ADSL Performance Status
24 Hour ADSL Performance History
7 Day ADSL Performance History
ADSL Alarm History
ADSL Transceiver Configuration Menu*
ADSL Link Reset
Bridge Menu
Bridge Aging Time
Bridge Reset
Bridge Statistics Menu
Source Address Database Menu
Remote Logon
*Read-only field for the Megabit Modem 320F
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Logging Off
The following table shows the keyboard functions used to navigate the management interface
and to select menu options.
Key
Function
ESC
Restores the selected parameter to the last saved setting. This applies only
to parameters for which you type a value but not to parameters for which
you toggle to select a value.
M
Opens the Main Menu.
Q
Logs you off the management interface from the Main Menu.
Returns to the previous menu.
R
CTRL
CTRL
C
R
T
Refreshes the data on the current screen.
Toggles between ATU-C and ATU-R menus.
On performance screens, clears the current performance screen values.
On the ADSL Configuration menu, confirms the new configuration and
suppresses the confirmation prompts.
N
P
U
Selects the next performance screen.
Selects the previous performance screen.
Restores a previous setting by undoing the last action.
You configure Megabit Modem 310F and 320F parameters in two ways:
•
Toggle among predefined settings:
1
2
Type the number preceding a parameter to select it.
Press the SPACEBAR to toggle among the available settings until the desired setting
displays, then press ENTER .
•
Type required information:
1
2
Type the number preceding a parameter to select it. A prompt displays.
Type the requested information, following the instructions on the screen, then
press ENTER .
LOGGING OFF
From the Main Menu, type Q to log off the management interface.
14
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CONFIGURING THE MODEMS
4
Configure the Megabit Modem 310F and 320F using an ASCII terminal or PC running a
terminal emulation program connected to the RS-232 port.
SETTING SYSTEM CONFIGURATIONS
From the System Configuration menu, you can set the system time and date, change the password,
and reset the modems to factory default values.
1
From the Main Menu (page 11), type 1 to display the System Menu.
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SYSTEM MENU
1. SYSTEM INFORMATION
2. SYSTEM CONFIGURATION
(M)ain
ENTER CHOICE-->
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Setting System Configurations
2
Type 2 to display the System Configuration menu.
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ATU-C ADSL MEGABIT MODEM TERMINAL v 1.0
SYSTEM CONFIGURATION
1. CHANGE SYSTEM TIME
2. CHANGE SYSTEM DATE
3. CHANGE PASSWORD
4. FACTORY DEFAULT CONFIGURATION
5. ATU-R LOGIN ENABLED
(R)eturn
(M)ain
ENTER CHOICE-->
Changing the System Time
1
From the System Configuration menu, type 1 to select Change System Time.
The following message displays: Please enter a new time: HH:MM:SS
2
At the system prompt, type the new time in specified two-digit 24-hour format, then
press ENTER .
The new time displays in the upper right corner of the screen.
Changing the System Date
1
From the System Configuration menu, type 2 to select Change System Date.
The following message displays: Please enter a new date: MM:DD:YY
2
At the system prompt, type the new month, day and year in the specified two-digit numeric
format, then press ENTER .
The new date displays in the upper left corner of the screen.
16
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Chapter 4: Configuring the Modems
Changing the Logon Password
1
2
3
From the System Configuration menu (page 16), type 3 to select Change Password.
The following message displays: Creating user password, press ENTER
Press ENTER .
The following prompt displays: Please enter the new password
At the system prompt, type the new password, using up to eight characters, then press
ENTER . (An * displays as you type each character.)
After you press ENTER , the following prompt displays: Please retype the new
password
4
At the system prompt, type the new password again, then press ENTER .
The following prompt displays: Password accepted
If you change the default password, write it down and save it in a secure place.
If you forget your new password, you will be unable to log on to the modem.
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17
Setting System Configurations
Restoring Factory Default Settings
The following table summarizes the factory default settings. The procedure restores all settings
to their factory defaults.
Setting
Factory Default
System
Logon Password
ENTER
ATU-R Login (Megabit Modem 320F
Craft Port Access)
Enable
ADSL
Startup Mode
Margin
Adaptive Rate
4 dB
Upstream Data Rate
928 kbps - maximum
64 kbps - minimum
7040 kbps - maximum
64 kbps - minimum
3 dB
Downstream Data Rate
SNR Margin Threshold
ES Threshold
100
Alarm Severity
Interleave
4 ns
Bridging
Bridge Aging Time
300
1
2
From the System Configuration menu (page 16), type 4 to select Factory Default Configuration.
The following message displays: This will reset all the configurations
and the ADSL modem. Are you sure? (Y/N)
Do one of the following:
•
Type Y to reset the modem. When you type Y , the modem restarts with the factory
default settings in effect. The following message displays: NVRAM Updated.
•
Type N to discontinue this procedure.
When you select yes to restore the factory default configuration, the modem
automatically writes the factory default values to NVRAM and resets the ADSL
link between the Megabit Modem 310F and 320F. You are automatically logged
off the modem(s) and must log on again.
18
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Chapter 4: Configuring the Modems
3
If you typed Y to restore factory default settings, you must press the SPACEBAR several
times to display the Logon screen. Then, log on to the modem(s).
Disabling or Enabling the RS-232 Port For the Megabit Modem 320F
You can enable or disable the RS-232 port for the Megabit Modem 320F from the
Megabit Modem 310F management interface. The screen option is ATU-R Login and the default
setting is Enabled.
The ATU-R Login option displays for the remote modem only when you are
logged on to the Megabit Modem 310F (ATU-C).
The current status of the Megabit Modem 320F RS-232 port (enable or disable)
displays to the right of the ATU-R Login option.
1
From the System Configuration menu, type 5 to select a new ATU-R Login option. (When the
RS-232 port status is ENABLED, it changes to DISABLED after typing 5 .)
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SYSTEM CONFIGURATION
1. CHANGE SYSTEM TIME
2. CHANGE SYSTEM DATE
3. CHANGE PASSWORD
4. FACTORY DEFAULT CONFIGURATION
5. RT LOGIN
DISABLED
(R)eturn (M)ain
Press RETURN to confirm, ESC to cancel
ENTER CHOICE-->
2
Press ENTER to confirm the new ATU-R Login option for the RS-232 port. The new option
displays to the right of ATU-R Login.
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19
Configuring ADSL Service
You configure ADSL transceiver service from the Megabit Modem 310F
(ATU-C) only. The ADSL Configuration Menu items are read-only from the
Megabit Modem 320F (ATU-R). You must reset the ADSL Link to activate ADSL
configuration changes (page 26).
This section describes how to configure ADSL data transmission parameters.
1
From the Main Menu (page 11), type 2 to display the ADSL Menu.
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ADSL MENU
1. ADSL PERFORMANCE STATUS
2. 24 HOUR ADSL PERFORMANCE HISTORY
3. 7 DAY ADSL PERFORMANCE HISTORY
4. ADSL ALARM HISTORY
5. ADSL CONFIGURATION MENU
6. ADSL LINK RESET
(M)ain
ENTER CHOICE-->
2
From the ADSL Menu, type 5 to display the ADSL Configuration Menu.
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ADSL CONFIGURATION MENU
1. STARTUP OPTION
2. (MAX) UP DATA RATE
3. (MAX) DOWN DATA RATE
4. (MIN) UP DATA RATE
5. (MIN) DOWN DATA RATE
ADAPTIVE RATE
928 ( 64 - 928 Kbps)
7040 ( 64 - 7040 Kbps)
64
( 64 - 928 Kbps)
64
( 64 - 7040 Kbps)
6. STARTUP SNR MARGIN
7. MARGIN THRESHOLD
8. ES THRESHOLD
4dB
3
100
9. ALARM CONFIGURATION
A. UP INTERLEAVE OPTION
B. DOWN INTERLEAVE OPTION
LOF=E MAR=E ES=E SES=E LOS=E
4 msec
4 msec
SELF=E
(U)ndo (R)eturn (M)ain
ENTER CHOICE-->
20
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Chapter 4: Configuring the Modems
Configuring the Startup Settings
the Megabit Modem 310F and 320F. The fields are Read Only Parameters
when you access them through the management interface for the Megabit
Modem 320F.
You configure the Startup Option and Startup SNR Margin to establish how the modem comes
up to achieve a transmission rate after a reset (see page 26 for resetting the modem).
Select the Startup Option
1
2
From the ADSL Configuration Menu (page 20), type 1 to select Startup Option.
Press the SPACEBAR to sequence to the Startup Option you want, then press ENTER .
The startup option determines how an ADSL transmission rate is established when
the modem is reset. The default is Adaptive Rate. The following table describes the
available options.
Startup Option
Description
Adaptive Rate
The modem comes up at the highest possible data rate based on the
configured startup margin and line conditions. Adaptive Rate is the default.
Fixed Rate
At startup, the system attempts only the rates you configure in “Configuring
Data Rates” on page 22, which include maximum upstream and downstream
data rates cannot be obtained, the system continues to attempt the data rate.
If it does not achieve the data rate, the modems will not sync.
Select the Startup SNR Margin
1
2
From the ADSL Configuration Menu (page 20), type 6 to select Startup SNR Margin.
Press the SPACEBAR to sequence to the Startup SNR Margin value you want, then
press ENTER .
The Startup SNR Margin is the margin that the modem must achieve to come up. The
available values range from 0 to 15 dB. The default is 4 dB.
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21
Configuring ADSL Service
Configuring Data Rates
You can configure the data rate only from the Megabit Modem 310F for both the
Megabit Modem 310F and 320F. The data rate fields are Read Only
Parameterswhen you access them from the Megabit Modem 320F (ATU-R).
You configure the minimum and maximum data rates for both upstream and downstream traffic.
The maximum data rates determine the rate the modem must achieve to come up when the
startup option is set to Fixed Rate (see page 21).
1
Configure the upstream data rates (transmission toward the Megabit Modem 310F):
a
From the ADSL Configuration Menu (page 20), type 2 to select (Max) Up Data Rate.
The following message displays: Enter valid input
b
Type a maximum upstream data rate, in kbps, then press ENTER .
The valid data rate values are increments of 32 between 64 and 928 kbps. If you enter
a value that is not an increment of 32, the modem automatically adjusts it to the closest
increment of 32. The default is 928 kbps.
c
Type 4 to select (Min) Up Data Rate.
The following message displays: Enter valid input
d
The valid data rate values are increments of 32 between 64 and 928 kbps. If you enter
a value that is not an increment of 32, the modem automatically adjusts it to the closest
increment of 32. The default is 64 kbps.
2
Configure the downstream data rates (transmission toward the Megabit Modem 320F):
a
From the ADSL Configuration Menu (page 20), type 3 to select (Max) Down Data Rate.
The following message displays: Enter valid input
b
Type a maximum downstream data rate, in kbps, then press ENTER .
The valid data rate values are increments of 32 between 64 kbps and 7040 kbps. If you
enter a value that is not an increment of 32, the modem automatically adjusts it to the
closest increment of 32. The default is 7040 kbps.
22
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Chapter 4: Configuring the Modems
c
Type 5 to select (Min) Down Data Rate.
The following message displays: Enter valid input
d
Type a maximum downstream data rate, in kbps, then press ENTER .
The valid data rate values are increments of 32 between 64 kbps and 7040 kbps. If you
enter a value that is not an increment of 32, the modem automatically adjusts it to the
closest increment of 32. The default is 64 kbps.
Configuring the SNR Margin Threshold
The margin threshold determines the SNR margin value below which an SNR margin alarm
occurs and the MAR LED on the modem front panel turns off.
1
From the ADSL Configuration Menu (page 20), type 7 to select Margin Threshold.
The following message displays: Enter Valid Input
Type an SNR dB value between 0 and 15, then press ENTER .
The default value is 3 dB.
2
Configuring the ES Threshold
The ES (Errored Seconds) Threshold is the number of acceptable seconds in a 15-minute
interval during which errors occur. If the number of errored seconds in the 15-minute interval
exceeds this value, an ES alarm occurs.
1
From the ADSL Configuration Menu (page 20), type 8 to select ES Threshold.
The following message displays: Enter valid input
Type an ES threshold value between 0 and 255, then press ENTER .
The default value is 100.
2
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Configuring ADSL Service
Configuring Alarms
You can configure the severity of each modem alarm, or disable alarms.
1
2
From the ADSL Configuration Menu (page 20), type 9 to select Alarm Configuration.
Type N to move to the next alarm type until you select the one you want to configure.
The following table identifies the available alarm types.
Alarm Type
Description
LOF
MAR
ES
Loss of Frame
Margin
Errored Seconds
Severely Errored Seconds
Loss of Signal
Self test failed
SES
LOS
SELF
3
Press the SPACEBAR to toggle to the setting you want for the alarm, then press ENTER .
The following table describes the available alarm settings. The default for each alarm is E.
Setting
Description
E
Enables the alarm as a minor alarm.
Enables the alarm as a major alarm.
Disables the alarm.
M
D
24
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Chapter 4: Configuring the Modems
Configuring the Interleave Options
It is important to note that an increase in impulse noise immunity causes an
increase in delay.
Use the interleave option to increase impulse noise immunity. The delay is in milliseconds for
both the Up and Down Interleave Options (upstream and downstream traffic).
1
2
From the ADSL Configuration Menu (page 20), type A to select Up Interleave Option.
Press the SPACEBAR to toggle to the interleave value you want, then press ENTER .
The available options are 0, 2, 4, 8 and 16 msec. The recommended interleave delay is
4 msec, to achieve maximum transmission rates with adequate noise immunity. The
default is 4.
3
4
Type B to select Down Interleave Option.
Press the SPACEBAR to toggle to the interleave value you want, then press ENTER .
The available options are 0, 2, 4, 8 and 16 msec. The recommended interleave delay is
Saving ADSL Configuration Changes
After you make changes to ADSL configuration from the ADSL Configuration Menu (page 20),
you must either accept or not accept these changes before you can return to ADSL Menu
(page 20).
1
When you finish making changes to ADSL configuration, type M or R to exit the
ADSL Menu.
The following prompt displays: Save current settings (Y/N)?
Type Y to save the changes you made or type N to not save the changes you made.
You return to the ADSL Menu.
2
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Configuring ADSL Service
Resetting the ADSL Link
After you make any ADSL configuration changes, you must reset the ADSL link to activate the
new configuration and reestablish the ADSL link.
1
From the ADSL Menu (page 20), type 6 to reset the ADSL link.
The following prompt displays: This will bring down the ADSL link. Are
you sure (Y/N)?
When you select yes, the modem automatically resets the ADSL link between
the Megabit Modem 310F and 320F. You are automatically logged off the
modem(s) and must log on again.
2
Do one of the following:
•
Type Y to reset the ADSL link.
The following message displays: ADSL link reset
•
Type N if you do not want to reset the modem. (If you do not reset the modem, ADSL
configuration changes you made are not activated.)
26
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Chapter 4: Configuring the Modems
CONFIGURING BRIDGE PARAMETERS
Configure the Ethernet bridging parameters. The LAN mode for the Megabit Modem 310F and
320F is half duplex.
1
On the Main Menu (page 11), type 3 to display the Bridge Menu.
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ATU-C ADSL MEGABIT MODEM TERMINAL v 1.0
BRIDGE MENU
LAN LINK STATUS
UP
300 SECONDS
1. BRIDGE AGING TIME
2. BRIDGE RESET
3. BRIDGE STATISTICS MENU
4. SOURCE ADDRESS DATABASE MENU
(M)ain
ENTER CHOICE-->
Configuring Bridge Aging Time
The Bridge Aging Time determines the interval at which the modem checks the bridging table
for unused addresses and marks those addresses as invalid. The default is 300 seconds.
1
2
Type 2 to select Bridge Aging Time.
Type the value in seconds (valid range is from 1 to 511) that you want, then press ENTER .
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27
Configuring Bridge Parameters
Configuring the Source Address Database
The source address database can contain up to 8,192 entries. Addresses can be entered either
automatically through address learning on the LAN port, or manually. Each address is
mapped to a 10-bit key, which is used to group the addresses into 1,024 separate buckets
containing up to eight addresses in each bucket. This reduces the search time required to locate
an address in the address table by requiring the processor to search only one bucket, or a
maximum of eight addresses.
1
From the Bridge Menu, type 4 to display the Source Address Database Menu.
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ATU-C ADSL MEGABIT MODEM TERMINAL v 1.0
SOURCE ADDRESS DATABASE MENU
1. READ ALL VALID MAC ENTRIES
4. CREATE STATIC MAC ADDRESS ENTRY
2. READ ENTRY BY MAC ADDRESS
3. READ BUCKET
5. DELETE STATIC MAC ADDRESS ENTRY
6. DISPLAY ALL STATIC MAC ADDRESS ENTRIES
BUCKET NUMBER = 0
TYPE
----
--
--
--
--
--
--
--
VALID
-----
INV
INV
INV
INV
INV
INV
INV
MAC ADDRESS
-----------
00:00:00:00:00:00
00:00:00:00:00:00
00:00:00:00:00:00
00:00:00:00:00:00
00:00:00:00:00:00
00:00:00:00:00:00
00:00:00:00:00:00
00:00:00:00:00:00
--
INV
(R)eturn (M)ain (N)ext (P)revious (U)pdate
ENTER CHOICE-->
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Chapter 4: Configuring the Modems
The following table describes the data displayed on the Source Address Database Menu.
Column
Description
TYPE
Indicates the method by which the entry was added to the table.
The options are:
DYN
STAT
---
Dynamic is automatically learned by the LAN port.
Static is entered manually.
Indicates that the table row is empty.
VALID
VAL - Indicates that the entry is valid and being used.
INV - Indicates that the entry is not being used.
MAC ADDRESS
The MAC address associated with the parameters contained in that
row of the bridging table.
2
To view all valid Bridge Address Table entries by MAC address:
a
Type 1 to select Read All Valid MAC Entries.
The message displays: Searching Database
Eight entries, that result from the search, display. The bucket number indicates the
last bucket searched.
The message displays: Press C to Continue Searching
Type C to display the next eight entries of the search.
b
When no more entries are found in the database, the message displays:
Search Finished
3
4
To view a Bridge Address Table entry by MAC address:
a
Type 2 to select Read Entry by MAC Address.
The message displays: Please enter MAC Address
(aa:bb:cc:dd:ee:ff)
b
Type the MAC address, then press ENTER .
To view all the entries in a specific bucket:
a
Type 3 to select Read Bucket.
The message displays: Please enter bucket number
Type the desired bucket number, then press ENTER .
b
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Configuring Bridge Parameters
5
To add a static MAC address to the Bridge Address Table:
a
Type 4 to select Create Static MAC Address Entry.
The message displays: Please enter MAC Address
(aa:bb:cc:dd:ee:ff)
b
c
Type the MAC address, then press ENTER .
Type U to update the data in the current bucket, or type 6 to Display All
Static MAC Address Entries.
6
To delete a static MAC address from the Bridge Address Table:
a
b
c
Type 5 to select Delete Static MAC Address Entry.
The message displays: Please enter MAC Address
(aa:bb:cc:dd:ee:ff)
Type the MAC address, then press ENTER .
The MAC address you just deleted displays:
MAC address = aa:bb:cc:dd:ee:ff
Type U to update the data in the current bucket, or type 6 to Display All
Static MAC Address Entries.
7
To view all Bridge Address Table static MAC entries:
a
Type 6 to select Display All Static MAC Entries.
The message displays: Searching Database
Eight entries, that result from the search, display. The bucket number indicates the
last bucket searched.
The message displays: Press C to Continue Searching
Type C to display the next eight entries of the search.
b
When no more entries are found in the database, the message displays:
Search Finished
Resetting the Bridge
Use the Bridge Reset option to reset the modem bridge function. Under rare conditions, the
bridge function may stop forwarding frames. If the DSL link is up and no errored seconds are
accumulating, but Ethernet data is not passing through the modem, a bridge reset on either the
ATU-C or ATU-R unit may resolve the problem.
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MONITORING CIRCUIT STATUS
AND DISPLAYING SYSTEM
INFORMATION
5
Monitor circuit status for the Megabit Modem 310F and 320F using an ASCII terminal or PC
MONITORING ADSL STATUS
From the Main Menu (page 11), type 2 to display the ADSL Menu. From this menu, you can select
items 1 through 4 to provide status on the ADSL link, as described in the following sections.
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03:25:24
ATU-R ADSL MEGABIT MODEM TERMINAL v 1.0
ADSL MENU
1. ADSL PERFORMANCE STATUS
2. 24 HOUR ADSL PERFORMANCE HISTORY
3. 7 DAY ADSL PERFORMANCE HISTORY
4. ADSL ALARM HISTORY
5. ADSL CONFIGURATION MENU
6. ADSL LINK RESET
(M)ain
ENTER CHOICE-->
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31
Monitoring ADSL Status
The ADSL Performance Status screen is updated every second and provides a summary of the
current ADSL status, including alarms, for both upstream and downstream traffic. The SNR
(signal-to-noise ratio) Margin row displays both the current SNR margins and the minimum
SNR margins for the current 24-hour data collection period.
On the ADSL Menu (page 31), type 1 to display the ADSL Performance Status screen.
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03:25:24
ATU-R ADSL MEGABIT MODEM TERMINAL v 1.0
ADSL PERFORMANCE STATUS
DOWN ALARMS:
UP ALARMS:
SYSTEM STATE:
NONE
NONE
DATA
DOWNSTREAM
----------
cur/min
UPSTREAM
--------
cur/min
SNR MARGIN (dB):
LINE ATTN (dB):
24 HOUR ES:
16.0/15.1
4.60
0
4.1/3.9
0.9
0
24 HOUR UAS:
0
0
DATA RATE (kbps):
7040
800
(C)lear
(R)eturn
(M)ain
ENTER CHOICE-->
Type C to clear the ADSL performance and alarm counters in both the Megabit Modem 310F
and 320F. See the table on page 33 for a definition of each status field.
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Chapter 5: Monitoring Circuit Status and Displaying System Information
The following table describes the data displayed on the ADSL Performance Status screen.
Field
Meaning
Down Alarms
Identifies the current downstream alarms (toward the Megabit
Modem 320F). Options:
•
•
•
•
•
•
•
LOF - Loss of Frame
LOS - Loss of Signal
MAR - Margin
ES - Errored Seconds
SES - Severely Errored Seconds
SELF - Self Test Failed
NONE - No current alarms
Up Alarms
Identifies the current upstream alarms (transmission toward the
Megabit Modem 310F).
System State
Identifies the state of the ADSL system:
•
•
•
•
•
ACK - Acknowledge during handshake.
TRAINING - Modem is currently training.
CHANA - Channel analysis is in process.
EXCH - Exchange final handshaking messages.
DATA - Link is up and data can be transferred.
SNR Margin (dB)
Line Attn (dB)
Identifies the current (cur) and minimum (min) margin values for
the ADSL loop for the current 24-hour period. See “Reach, Data
Rate, SNR Margin, and Noise Environment” on page 48 for
information on SNR margin and BER.
Indicates the line attenuation for the upstream and downstream
ADSL channels. Line attenuation is the decrease in amplitude of the
signal between transmission and receipt.
24 Hour ES
Indicates the total number of errored seconds that were detected on
the ADSL link during the current 24-hour period.
24 Hour UAS
Indicates the total number of unavailable seconds (UAS) that were
detected on the ADSL link during the current 24-hour period. UAS
indicate the amount of time that the lines were unavailable for
transmission since the modem was powered up or cleared.
Data Rate (kbps)
Identifies the current rates at which data is being transmitted.
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Monitoring ADSL Status
Monitoring 24 Hour ADSL Performance History
The 24 Hour ADSL Performance History report consists of eight screens. Each screen displays three
hours of data, in 15-minute increments. Together, the eight screens provide a summary of the
24-hour performance history.
From the ADSL Menu (page 31), type 2 to open the 24 Hour ADSL Performance History screen.
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ATU-R ADSL MEGABIT MODEM TERMINAL v 1.0
24 HOUR ADSL PERFORMANCE HISTORY
(errored seconds/unavailable seconds/snr)
DOWNSTREAM
UPSTREAM
02:45 000/000/15.5
02:30 000/000/16.0
02:30 000/000/ NA
02:30 000/000/ NA
02:45 000/000/ NA
02:30 000/000/ NA
02:30 000/000/ NA
02:30 000/000/ NA
02:45 000/000/ NA
02:30 000/000/ NA
02:30 000/000/ NA
02:30 000/000/ NA
000/000/3.9
000/000/3.9
000/000/ NA
000/000/ NA
000/000/ NA
000/000/ NA
000/000/ NA
000/000/ NA
000/000/ NA
000/000/ NA
000/000/ NA
000/000/ NA
(C)lear (P)revious (N)ext (R)eturn (M)ain
ENTER CHOICE-->
To clear all ES and UAS counts, including the equivalent counts in the remote unit, type C . The
minimum SNR for the period is reset to the current SNR.
The 24 Hour ADSL Performance History data is lost when the modem is
turned off.
34
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Chapter 5: Monitoring Circuit Status and Displaying System Information
The 7 Day ADSL Performance History menu displays the ES and UAS counts, and the minimum
SNR margins for the current day and the previous six days. Each day begins at 12 A.M.
midnight, therefore the current day count is not necessarily equal to the count for the past 24
hours.
From the ADSL Menu (page 31), type 3 to open the 7 Day ADSL Performance History screen.
07/20/99
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03:25:24
ATU-R ADSL MEGABIT MODEM TERMINAL v 1.0
7 DAY ADSL PERFORMANCE HISTORY
(errored seconds/unavailable seconds/snr)
DOWNSTREAM
UPSTREAM
01/01/99
12/31/98
12/30/98
12/29/98
12/28/98
12/27/98
12/26/98
00000/00000/ 20.4
00000/00000/
00000/00000/
00000/00000/
00000/00000/
00000/00000/
00000/00000/
00000/00000/
4.1
NA
NA
NA
NA
NA
NA
00000/00000/
00000/00000/
00000/00000/
00000/00000/
00000/00000/
00000/00000/
NA
NA
NA
NA
NA
NA
(C)lear (R)eturn (M)ain
ENTER CHOICE-->
To clear all ES and UAS counts, including the equivalent counts in the remote unit, type C .
The minimum SNR for the period is reset to the current SNR.
The 7 Day ADSL Performance History data is lost when the modem is turned off.
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Monitoring ADSL Status
Monitoring ADSL Alarm History
The ADSL Alarm History screen displays the current status and first and last occurrence of each
ADSL alarm type.
From the ADSL Menu (page 31), type 4 on the ADSL Menu to open the ADSL Alarm History
screen.
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03:25:24
ATU-R ADSL MEGABIT MODEM TERMINAL v 1.0
ADSL ALARM HISTORY
Type
First
Last
Curr
Time(s)
LOF, DOWN
LOF, UP
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
MARGIN, DOWN
MARGIN, UP
ES, DOWN
ES, UP
SES, DOWN
SES, UP
LOS, DOWN
LOS, UP
SELFTEST
OK
LAST CLEARED 07/20/99-02:06:14
(C)lear (R)eturn (M)ain
ENTER CHOICE>
Type C to clear the first and last date/time stamps.
The Alarm History data is lost when the Megabit Modem 310F is turned off.
36
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Chapter 5: Monitoring Circuit Status and Displaying System Information
The following table describes the information displayed on the ADSL Alarm History screen.
Name
Description
Type
Identifies local, remote, and ADSL link alarms:
•
•
•
•
•
•
•
LOF: Loss of frame failure
MARGIN: Low SNR margin alarm
ES: Errored seconds
SES: Severely errored seconds
LOS: Loss of signal
SELFTEST: Whether the self test was successful or not.
LAST CLEARED: The time the screen was last cleared.
First
Lists the first time an alarm is detected.
Lists the last time an alarm was detected.
Identifies the current status of the alarm.
Lists the time in seconds that any alarm occurred.
Last
Current
Time(s)
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Monitoring Ethernet Bridge Statistics
MONITORING ETHERNET BRIDGE STATISTICS
The Megabit Modem 310F and 320F provide real-time, non-disruptive monitoring of system
performance. The display is updated every second.
1
From the Main Menu (page 11), type 2 to open the Bridge Menu.
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ATU-C ADSL MEGABIT MODEM TERMINAL v 1.0
BRIDGE MENU
LAN LINK STATUS
UP
300 SECONDS
1. BRIDGE AGING TIME
2. BRIDGE RESET
3. BRIDGE STATISTICS MENU
4. SOURCE ADDRESS DATABASE MENU
(M)ain
ENTER CHOICE-->
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Chapter 5: Monitoring Circuit Status and Displaying System Information
2
From the Bridge Menu, type 3 to open the Bridge Statistics Menu.
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00:02:32
ATU-C ADSL MEGABIT MODEM TERMINAL v 1.0
BRIDGE STATISTICS MENU
LAN PORT
WAN PORT
BRIDGE
RX BYTES
RX FRAMES
RX MCASTS
RX DISCARDS
RX ERRORS
RX SMALL
RX BIG
252436 RX BYTES
1476 RX FRAMES
922 RX DISCARDS
1186 RX ERRORS
0 RX BIG
0 ENTRIES LEARNED
0 ENTRIES NOT LEARNED
0 LAN FILTERED FRAMES
0
0
20
0
99
0
0
TX BYTES
0 TX BYTES
0 TX FRAMES
0
0
0
0
TX FRAMES
TX MCASTS
TX EX COLS
(R)eturn (M)ain
(C)lear
ENTER CHOICE-->
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Monitoring Ethernet Bridge Statistics
The following table describes the data displayed on the Bridge Statistics Menu.
Field
Definition
Rx Bytes
The number of bytes received.
Rx Frames
Rx MCASTS
Rx Errors
Rx Runts
The number of frames received.
The number of multicast frames received.
The number of errored frames received.
The number of frames received that are smaller than the Ethernet
minimum of 64 bytes.
Rx MTU Ex
The number of frames received that exceed the Maximum Transmit Unit
size of 1518 bytes.
Tx Bytes
The number of bytes transmitted.
Tx Frames
Tx MCASTS
Tx Ex Cols
The number of frames transmitted.
The number of multicast frames transmitted.
The number of excessive collision events that have occurred - frame
dropped because of 16 consecutive collisions.
TX Discards
The number of frames dropped due to a buffer overflow.
Entries Learned
The number of entries learned on the LAN port and added to the bridging
table.
Entries Not Learned
LAN Filtered Frames
The number of entries in the bridging table that were not learned because
the table was full.
The number of frames filtered on the LAN port by the bridging process.
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Chapter 5: Monitoring Circuit Status and Displaying System Information
DISPLAYING SYSTEM INFORMATION
The System Information screen provides general product information, such as hardware serial
numbers and software revision numbers.
1
2
From the Main Menu (page 11), type 1 to open the System Menu.
From the System Menu, type 1 to display the System Information screen. This screen
provides the information described in the table below.
07/20/99
MODEM
PAIRGAIN TECHNOLOGIES
ATU-C ADSL MEGABIT MODEM TERMINAL v 1.0
04:08:13
SYSTEM INFORMATION
ATU-C
ATU-R
150-2102-01
PRODUCT NUM
150-2103-01
SOFTWARE REV
PROM CHECKSUM
1.0
6C01
1.0
BC9D
HISTORY
DAYS IN OPERATION
125
125
(R)eturn (M)ain
ENTER CHOICE-->
Information
Description
Modem
Product Number
Software Rev
The ADC 150 part number for the modem.
The version number of the software that is installed on the modem.
The number that is used to verify that the compiled code is valid.
PROM Checksum
History
Day in Operation
The number of days that the modem has been in operation. The
number of days is stored in non-volatile memory and retained even
when the modem is power off and on again. The day increments
when the time increases past 23:59:59 - 00:00:00.
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Displaying System Information
42
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ABOUT THE TECHNOLOGY
A
This appendix provides more information about the bridging and ADSL transmission features
of the Megabit Modem 310F and 320F.
MAC LAYER BRIDGING
A bridge moves information across an internetwork from a source to a destination at the link
layer (of an OSI reference model). The information is forwarded or filtered based on its Media
Access Control (MAC) address.
The Megabit Modem 310F and 320F provide transparent Ethernet MAC level bridging which
includes learning, forwarding, filtering, and hashing/buffer management.
Forwarding performance is at full DMT rate and filtering performance is at full Ethernet rate of
14 kpps for 64-byte frames (minimum size).
Neither the Megabit Modem 310F nor 320F support the Spanning Tree protocol. Therefore, the
modems cannot be used to provide link redundancy to a LAN segment.
DATA ENCAPSULATION
Data transmitted over the ADSL link comprises HDLC encapsulated Ethernet MAC frames as
shown in the figure below.
1
1
6
6
2
46-1500
Data
2
Flag Address Control Destination Address Source Address Length/Type
0x7E 0xFF 0x03
FCS Flag
One or more flag patterns (0x7E) occur between frames to indicate the frame boundaries.
Zero bit insertion is used for data transparency. This means that a zero is inserted after every
occurrence of five consecutive ones (1s) in the data field. This prevents a flag pattern from
occurring in the data.
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Ethernet Frame Rates
ETHERNET FRAME RATES
The following sections show Ethernet maximum frame transmission rates, dependent on the
additional bit and bit stuffing set for the xDSL transmission.
Minimum xDSL Bit Stuffing, One Additional Bit
Ethernet
Data rate
Preamble
CRC
10 Mbps
8 bytes
4 bytes
Interframe gap
9.60E-06 s
xDSL
Flags
1 byte
FCS
2 bytes
2 bytes
5 bytes
1 bit
Protocol
Overhead/Frame
Additional bits
Bit stuffing
min (min/max)
The values in the table below show the frames per second for the maximum xDSL rate.
Frame Size
(da:sa:lt:data:crc
)
xDSL Data Rate
1536
7040
kbps
6400
kbps
3200
kbps
896 kbps 768 kbps 384 kbps 64 kbps
kbps
[bytes]
64 13,512.5 12,284.1
6,142.0
3,097.8
779.5
2,948.2
1,486.9
374.2
1,719.8
867.4
218.3
109.3
73.7
1,474.1
743.5
187.1
93.6
737.0
371.7
93.5
122.8
62.0
15.6
7.8
128
512
6,815.1
1,715.0
858.4
6,195.5
1,559.1
780.4
1024
1518
390.2
187.3
46.8
579.3
526.6
263.3
126.4
63.2
31.6
5.3
44
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Appendix A: About the Technology
The values in the table below show the minimum xDSL transmission time in milliseconds (ms).
Frame Size
(da:sa:lt:data:crc)
[bytes]
xDSL Data Rate
7040
kbps
6400
kbps
3200
kbps
1536
896 kbps 768 kbps 384 kbps 64 kbps
kbps
64
0.074
0.147
0.583
1.165
1.726
0.081
0.161
0.641
1.281
1.899
0.163
0.323
1.283
2.563
3.798
0.339
0.673
2.673
5.339
7.912
0.581
1.153
4.581
9.153
13.564
0.678
1.345
1.357
2.690
8.141
16.141
64.141
128
512
5.345
10.690
1024
1518
10.678
15.824
21.357 128.141
31.648 189.891
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Ethernet Frame Rates
Maximum xDSL Bit Stuffing, Zero Additional Bits
Ethernet
Data rate
Preamble
CRC
10 Mbps
8 bytes
4 bytes
Interframe gap
9.60E-06 s
xDSL
Flags
1 byte
FCS
2 bytes
Protocol
2 bytes
Overhead/Frame
Additional bits
Bit stuffing
5 bytes
0 bits
max (min/max)
The values in the table below show the frames per second for the maximum xDSL rate.
Frame Size
(da:sa:lt:data:crc)
[bytes]
xDSL Data Rate
1536
7040
kbps
6400
kbps
3200
kbps
896 kbps 768 kbps 384 kbps 64 kbps
kbps
64 11,318.3 10,289.4
5,144.7
2,589.0
650.0
2,469.5
1,242.7
312.0
1,440.5
724.9
182.0
91.1
1,234.7
621.4
156.0
78.1
617.4
310.7
78.0
102.9
51.8
13.0
6.5
128
512
5,695.8
1,430.0
715.6
5,178.0
1,300.0
650.5
1024
1518
325.3
156.1
39.0
482.9
439.0
219.5
105.3
61.5
52.7
26.3
4.4
46
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Appendix A: About the Technology
The values in the table below show the minimum xDSL transmission time in milliseconds (ms).
Frame Size
(da:sa:lt:data:crc)
[bytes]
xDSL Data Rate
7040
kbps
6400
kbps
3200
kbps
1536
896 kbps 768 kbps 384 kbps 64 kbps
kbps
64
0.088
0.176
0.699
1.397
2.071
0.097
0.193
0.769
1.537
2.278
0.194
0.386
1.538
3.074
4.556
0.405
0.805
3.205
6.405
9.492
0.694
1.379
0.810
1.609
1.620
3.219
9.719
19.313
76.922
128
512
5.494
6.410
12.820
1024
1518
10.980
16.272
12.810
18.984
25.620 153.719
37.969 227.813
RATE ADAPTIVE TRANSMISSION
The following definitions are useful for understanding the operation of the Megabit Modem:
•
Bit Error Rate (BER) is the ratio of received bits that are in error relative to the total number
of bits received, measured over time. For example, 10-7 BER means that on average one
error occurs per 107 bits received.
•
•
Signal to Noise Ratio (SNR) is the ratio (typically expressed in dB) of the received signal
power to the received noise power. It is a measure of the quality of the transmission.
Margin (SNR margin) is the amount of degradation in SNR that the system can tolerate
under the current conditions and still achieve a 10-7 BER. A margin of 6 dB, for example,
would mean that the SNR can degrade by 6 dB and still provide a performance of 10-7 BER.
The Megabit Modem 310F and 320F have a margin configuration option that defaults to 4
dB, but may be set anywhere between 0 to 15 dB.
•
Reach is the longest loop length that the system can support with a given margin and a BER
of less than 10-7 at the given data rate.
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Rate Adaptive Transmission
Rate Adaptation
With ADC's rate adaptive technology, the Megabit Modem 310F and 320F can automatically
adjust to the fastest speed possible, given the transmission distance and line conditions. Or, you
can set the modem to a specific rate. The available data rates are:
•
•
downstream rates: 64 kbps to 7040 kbps, in increments of 32 kbps
upstream rates: 64 kbps to 928 kbps, in increments of 32 kbps
The Megabit Modem 310F and 320F can be set to any one of two modes that determine how
the data rate is selected. It is important to note that rate adaptation occurs only during startup.
The Megabit Modem 310F and 320F will not change the data rate while the link is up. The
two startup modes are:
Startup Option
Description
Adaptive Rate
The modem comes up at the highest possible data rate
given the configured startup margin and line conditions.
Fixed Data Rate
At startup, the system attempts only the configured
maximum upstream and downstream data rates with a
margin greater than or equal to the configured margin. If the
data rates cannot be obtained, the system continues to
attempt the data rate. If it does not achieve it, the modems
will not sync.
When a connection is lost in any mode (the cable disconnected, for example), the system
Reach, Data Rate, SNR Margin, and Noise Environment
The maximum transmission rate of the Megabit Modem 310F and 320F is determined by
distance, SNR margin, and the condition of the line (wire gauge, condition noise environment).
The figure on page 49 shows the relationship between reach and data rate for a given set of
conditions. The plots can be used to determine the achievable reach at a given data rate, or they
may be used to determined the achievable data rates at a given distance. In all cases except the
no noise case, a margin of 4 dB was allocated above the SNR that provides a Bit Error Rate
(BER) of 10-7.
48
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Appendix A: About the Technology
Tomcat RT & CO-AFE Upstream Start-Up Margin
1000
900
800
700
600
500
400
300
200
100
0
0
2000 4000 6000 8000 10000 12000 14000 16000
Length 26 AWG
Tomcat RT & CO-AFE Downstream Start-Up Margin
8000
7000
6000
5000
4000
3000
2000
1000
0
0
2000 4000 6000 8000 10000 12000 14000 16000
Length 26 AWG
The reach tables above are for a noiseless environment.
The performance shown is typical for ADC Megabit Modem products. Due to
variations in environment and test setup, ADC does not guarantee performance
to the figures shown.
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49
Rate Adaptive Transmission
You can configure the Megabit Modem 310F and 320F startup margin setting. This setting
defaults to 4 dB but may be set from 0 - 15 dB. The modems will attempt to come up at the
programmed margin setting. Setting the margin high allows for a cushion against changing line
conditions and impulse noise. Setting the margin low provides less protection but allows the
modems to come up at a higher data rate (if in rate-adaptive mode) or at a longer loop length (if
in fixed data rate mode). The default setting of 3 dB is recommended and provides an overall
BER better than 10-10. Reducing the setting to 0 dB will provide a BER of less than 10-7 and
is not recommended.
50
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TECHNICAL SPECIFICATIONS AND
CONNECTOR PINOUTS
B
TECHNICAL SPECIFICATIONS
ADSL Line
Signal Format
DMT Line Code
up to 23 dBm
RJ-11
Transmit Signal Power
Connector
Ethernet Port
Connector
8-pin modular, 10BASE-T
14 Kpps (64-byte packets, both directions)
8,192 MAC addresses with aging
HDLC
Bandwidth Filtering
Address Learning
Encapsulation Format
Bridging
IEEE 802.1d transparent with learning on the LAN port only
Physical
Height
Width
Depth
Weight
1.25 in (3.175 cm)
6.75 in (17.15 cm)
5.5 in. (14.0 cm)
1.38 lb. (0.63 kg)
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51
Compliance
Electrical
Power Input
100 to 240 Vac, 50-60 Hz
Power Dissipation
Megabit Modem 320F (ATU-R) 3 W
Megabit Modem 310F (ATU-C) 4 W
Environmental
Operating Temperature
Relative Humidity
+32 to +122 °F (0 to 50 °C)
0 to 95% non-condensing
Operating Altitude
-200 to 13,000 ft. (-61 to 3962 meters)
Per FCC Part 15 Class B
Electromagnetic Emissions
Storage Temperature
Storage Altitude
-40 to 158 °F (-40 to 70 °C)
-1,000 to 30,000 ft. (-305 to 9,144 meters)
ASCII Terminal Maintenance Port
Type
RS-232C, RJ-45
Data Rate
Autobaud from 2400 to 19,200 baud
Not Supported
Hardware Flow Control
COMPLIANCE
Emissions and Immunity
Compliance
FCC Part 15, Subpart B, Class B
CENELEC/ETSI (IEC 801-2, -3, -4)
CE (EN 55022 and EN 50082-1)
UL1950 and cUL
Operations and Safety
Compliances
CE (EN 60950)
52
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Appendix B: Technical Specifications and Connector Pinouts
CONNECTOR PINOUTS
The following table shows connector pin assignments for the RJ-11 DSL connector.
Pin
Signal
1
2
3
4
5
6
Not Used
Not Used
ADSL Ring
ADSL Tip
Not Used
Not Used
The following table shows connector pin assignments for the 8-pin10BASE-T Ethernet
connector. The connector is MDI-X.
MDI Pin
MDI-X Pin
Signal
Description
1
2
3
4
5
6
7
8
3
6
1
4
5
2
7
8
TD+
Transmit Data (+)
TD-
Transmit Data (-)
RD+
Receive Data (+)
-
-
-
-
RD-
Receive Data (-)
-
-
-
-
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Connector Pinouts
The following table shows connector pin assignments for the 8-pin RS-232 port connector.
Pin
Signal
Signal Direction
1
2
3
4
5
6
7
8
Not Used
-
Receive Data (RD)
Transmit Data (TD)
Modem to terminal
Terminal to modem
Data Terminal Ready (DTR) Terminal to modem
DGND
-
Data Set Ready (DSR)
Not Used
Modem to terminal
-
-
Not Used
54
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CONTACTING ADC
C
ADC Customer Service Group provides expert pre-sales and post-sales support and training for
all its products. Technical support is available 24 hours a day, 7 days a week by contacting the
ADC Technical Assistance Center (TAC).
Sales Assistance
•
•
•
Quotation Proposals
800.366.3891 extension 73000 (USA and Canada)
952.917.3000
Ordering and Delivery
General Product Information
Fax: 952.917.3237
Systems Integration
800.366.3891, extension 73000 (USA and Canada)
952.917.3000
•
•
•
•
•
•
•
Complete Solutions (from concept to installation)
Network Design and Integration Testing
System Turn-Up and Testing
Network Monitoring (upstream or downstream)
Power Monitoring and Remote Surveillance
Service/Maintenance Agreements
Systems Operation
•
•
•
•
•
•
Technical Information
ADC Technical Assistance Center
800.638.0031
714.730.3222
Fax: 714.730.2400
Email: [email protected]
System/Network Configuration
Product Specification and Application
Training (product-specific)
Installation and Operation Assistance
Troubleshooting and Repair/Field Assistance
•
•
•
Online Technical Support
Online Technical Publications
Product Return Department
800.366.3891 ext. 73748 or
952.917.3748
ADC Return Material Authorization (RMA) number and
instructions must be obtained before returning
products.
Fax: 952.917.3237
Email: repair&[email protected]
All telephone numbers with an 800 prefix are toll-free in the USA and Canada.
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Limited Warranty
LIMITED WARRANTY
ADC DSL Systems, Inc. (“ADC”) warrants that, for a period of 12 months from the date of
shipment, the hardware portion of its products will be free of material defects and faulty
workmanship, under normal use. ADC's obligation, under this warranty, is limited to replacing
or repairing, at ADC's option, any such hardware product which is returned during the 12-month
warranty period per ADC's instructions and which product is confirmed by ADC not to comply
with the foregoing warranty.
ADC warrants that, for a period of 90 days from the date of purchase, the software furnished
with its products will operate substantially in accordance with the ADC published specifications
and documentation for such software. ADC’s entire liability for software that does not comply
with the foregoing warranty and is reported to ADC during the 90-day warranty period is, at
ADC’s option, either (a) return of the price paid or (b) repair or replace of the software. ADC
also warrants that, for a period of 30 days from the date of purchase, the media on which
software is stored will be free from material defects under normal use. ADC will replace
defective media at no charge if it is returned to ADC during the 30-day warranty period along
with proof of the date of shipment.
The transportation charges for shipment of returned products to ADC will be prepaid by the
Buyer. ADC will pay transportation charges for shipment of replacement products to Buyer,
unless no trouble is found (NTF), in which case the Buyer will pay transportation charges.
ADC may use reconditioned parts for such repair or replacement. This warranty does not apply
to any product which has been repaired, worked upon, or altered by persons not authorized by
ADC or in ADC's sole judgment has subjected to misuse, accident, fire or other casualty, or
operation beyond its design range.
The warranty for repaired products shall remain in effect until the end of the original warranty
period.
ADC DISCLAIMS ALL OTHER WARRANTIES, EITHER EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT
TO ITS PRODUCTS AND ANY ACCOMPANYING WRITTEN MATERIALS. FURTHER,
ADC DOES NOT WARRANT THAT SOFTWARE WILL BE FREE FROM BUGS OR
THAT ITS USE WILL BE UNINTERRUPTED OR REGARDING THE USE, OR THE
RESULTS OF THE USE, OF THE SOFTWARE IN TERMS OF CORRECTNESS,
ACCURACY, RELIABILITY OR OTHERWISE.
56
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GLOSSARY
D
The Glossary defines technical terms and abbreviations used in this manual.
ADSL
Asymmetric Digital Subscriber Line. A method of transmitting at different downstream and
upstream speeds.
Asymmetric
Transmission
Transmission which sends data at different rates in each direction.
ATU-C
ADSL Terminal Unit at the service provider site.
ADSL Terminal Unit at the remote site.
ATU-R
Bandwidth
Used to describe the capacity or amount of traffic (data, voice, or video) a certain
communications line is capable of accommodating.
BER
Bit Error Rate. The ratio of received bits that are in error.
A group of 25 or 50 pairs of wires.
Binder Group
Bit
In a binary system, the smallest unit of information. It is represented as a zero or a one.
Bridge
A two-port internetworking device that selectively filters or forwards traffic based or MAC
addresses.
Bridged
A pair of wires connected in parallel across a single line to form a "T" Tap configuration.
The direction of data reception from the Megabit Modem 310F to the Megabit Modem 320F.
Downstream
Ethernet
A baseband LAN specification that has become a series of standards produced by IEEE
referred to as IEEE 802.3.
HDLC
Hub
High-level Data Link Control.
A common wiring point for star-topology networks, and a common synonym for a
concentrator.
IEEE
Institute of Electrical and Electronics Engineers. A professional organization that defines
network standards.
kbps
kpps
LAN
Kilobits per second. A measure of transmission speed at 1,000 bits per second.
Kilo packets per second.
Local Area Network. The means by which a local community of users and workgroups can
share information and resources electronically.
LED
Light emitting diode.
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Line code
Any method of converting digital information to analog form for transmission on a
communication line.
Link
Another term used for transmission line.
MAC
Media Access Control. Associated with Layer 2 or the Data Link Layer of the ISO 7-layer
protocol model.
Margin
An ADSL parameter, measured in dB. It indicates the excess SNR, relative to the performance
of 10-7 BER, at the receiver point.
Mbps
Megabits per second. 1,000,000 bits per second.
Media Dependent Interface.
MDI
MDI-X
NVRAM
Port
Media Dependent Interface (cross-over).
Non-volatile RAM.
An I/O interface. A point at which signals may be introduced or extracted in a similar manner.
Plain Old Telephone Service.
POTS
RAM
Random Access Memory.
RFC
Request for Comment.
SNR
Signal-to-Noise ratio.
Telecommuter
A person who performs work at home while linked to the office by means of a
telecommunications-equipped computer system.
Upstream
WAN
The direction of data transmission from the Megabit Modem 320F to the Megabit
Modem 310F.
Wide Area Network. In this manual, refers to the ADSL link.
58
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ADC DSL Systems, Inc.
14402 Franklin Avenue
Tustin, CA 92780-7013
Tel: 714.832.9922
Fax: 714.832.9924
Technical Assistance
Tel: 800.638.0031
Fax: 714.730.3222
ISO 9001/TL 9000
DNV Certification, Inc.
REGISTERED FIRM
´,4K¶2W¨
1220432
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