Section 61225101L1-5B
Issue 2, December 2002
Express 6530 SHDSL NxNTU
Installation and Maintenance
CONTENTS
1. GENERAL .....................................................................1
2. CONNECTIONS ...........................................................4
3. OPTIONING ..................................................................7
4. SPECIFICATIONS......................................................18
5. WARRANTY AND CUSTOMER SERVICE ............19
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Express
6530
FIGURES
Figure 1. Express 6530 SHDSL NxNTU ...................... 1
Figure 2. Express 6530 Functional Overview ............... 2
Figure 3. Express 6530 Back Panel ................................4
Figure 4. Express 6530 Strap Map .................................7
Figure 5. Express 6530 Menu Tree.................................8
Figure 6. Cross-Connect Map .........................................9
Figure 7. Time Slot Allocation .....................................10
Figure 8. Framed Full E1 Service .................................11
Figure 9. Unframed Full E1 Service .............................11
Figure 10. Full Nx64k 2 Mbps Service ..........................12
Figure 11. Back-to-Back NTU Operation ......................12
Figure 12. Local Dual Sided Loopback .........................13
Figure 13. Remote Dual Sided Loopback ......................13
Figure 14. Local Customer Transparent Loopback ........14
Figure 15. Remote Customer Transparent Loopback ....14
Figure 16. Local Customer Nontransparent Loopback ..14
Figure 17. Remote Customer Nontransparent
Figure 1. Express 6530 SHDSL NxNTU
Line (SHDSL) technology to transport data over a
single copper loop. The Express 6530 interfaces
between the incoming ITU G.991.2 (SHDSL)
leased-line service and the customer’s Data Terminal
Equipment (DTE), providing solutions for
LAN-to-LAN bridging, Frame Relay, and/or PBX
termination.
The Express 6530 is a locally powered standalone unit
which contains an integrated Data Service Unit
(DSU), eliminating the need for a separate DSU. The
Express 6530 interfaces to a customer’s G.703, V.35,
or X.21 interfaces and can be provisioned to support
simultaneous G.703 and Nx64 services. The SHDSL
interface is designed to operate from 192 kbps to
2.304 Mbps in 64 kbps increments or from 3 to 36
time slots, with each time slot representing 64 kbps.
The SHDSL time slots can be multiplexed to the
G.703 and/or the Nx64 interfaces. The maximum
number of time slots that can be directed toward the
G.703 interface is 32 (2.048 Mbps), while the Nx64
can support 36 (2.304 Mbps). A block diagram of the
Express 6530 functionality is illustrated in Figure 2.
Loopback .......................................................14
Figure 18. Local Network Transparent Loopback .........14
Figure 19. Remote Network Transparent Loopback ......14
Figure 20. Local Network Nontransparent Loopback ....14
Figure 21. Remote Network Nontransparent
Loopback .......................................................14
Figure 22. CRC-4 Detection/Generation ........................16
TABLES
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
LED Descriptions ............................................2
Front Panel Pushbuttons ..................................3
SHDSL Pin Connections .................................4
G.703 Pin Connections....................................4
V.28 Pin Connections ......................................5
X.21 Pin Connections ......................................5
V.35 Pin Connections ......................................6
V.36 Pin Connections ......................................6
Loopback Overview ......................................15
The Express 6530 can be deployed in pairs for a local
campus application or to an LTU located in a Central
Office. The Express 6530 can be locally or remotely
provisioned with local provisioning being
accomplished through the V.28 control port using a
dumb terminal or PC with a terminal emulation
program. The Express 6530 can be remotely
provisioned by another Express 6530 or an ADTRAN
SHDSL LTU. The Express 6530 can initiate and
respond to local and remote loopbacks and has an
internal 215-1 pseudorandom test pattern for bit error
testing. Front panel-mounted LEDs and pushbuttons
provide interface and test status as well as the
initiation of a remote or local loopback.
Table 10. Express 6530 SHDSL NxNTU
Specifications ................................................18
1. GENERAL
This practice contains installation and maintenance
information for the Express 6530 SHDSL NxNTU,
P/N 1225101L1. The unit is illustrated in Figure 1.
The ADTRAN Express 6530 is a network terminating
unit using Single-Pair High Speed Digital Subscriber
Trademarks: Any brand names and product names included in this document are
trademarks, registered trademarks, or trade names of their respective holders.
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The Express 6530 has four front panel pushbuttons.
The buttons are protected from accidental operation.
The front panel button functions can be disabled via
the management interface. It is possible to disable the
port select SHDSL option to avoid the possibility of
looping the SHDSL port when disabled. Table 2 lists
and describes these four pushbuttons.
4. When the G.703 port is selected, the G.703 port
LED flashes as an indication.
If there is only a single service on the G.703 port
then the Local Loop/Err Inj, Remote Loop and
BERT buttons initiate/terminate tests and the
corresponding LEDs indicate the status of tests
on this port only.
The “Port Select” button operates in the following
manner:
If there are multiple services, the G.703 port
Local Loop/Err Inj, Remote Loop, and BERT
buttons are disabled, and the corresponding LEDs
indicate the status of tests on this port only
(initiated from sources other than the front panel
buttons).
1. When no port has been selected (indicated by
none of the port LEDs flashing), then only the
“Port Select” button is enabled and the LL, RL
and BERT LEDs are an ordered summation of
the test states of the Nx64k, G.703 and SHDSL
interfaces.
5. When the SHDSL port is selected, the SHDSL
port LED flashes as an indication. Note that the
SHDSL port select can only occur if enabled via
the management interface. The Local Loop/Err
Inj, Remote Loop, and BERT buttons will
2. The Port Select button cycles through the
following ports on each successive press:
• Nx64k
initiate/terminate tests and the corresponding
LEDs indicate the status of tests on this port only.
These tests are on the aggregate SHDSL payload
• G.703
• SHDSL (only if enabled via the EOC)
• No Selection
3. When the Nx64k port is selected, the Nx64k LED
will flash as an indication. The Local Loop/Err
Inj, Remote Loop and BERT buttons will initiate/
terminate tests and the corresponding LEDs
indicate the status of tests on this port only.
Port Select will not operate if any locally initiated
tests are in progress.
Table 2. Front Panel Pushbuttons
Button Label
Description
On each successive press, cycles through the following:
Nx64k, G.703, SHDSL, and No Select.
PORT SELECT
If a port is selected, and a BERT is not in progress then
pressing the button will initiate/terminate a local loopback
test on the selected port. If a BERT is in progress, then
pressing the button injects a single bit error.
LOCAL LOOP/ ERR INJ
REMOTE LOOP
If the SHDSL port is selected, then pressing the button will
initiate/terminate a remote loopback test on the port by
sending a request message to the remote unit. If the
Nx64k port or G.703 port (with only one service defined)
is selected, then pressing the button will initiate/terminate a
remote loopback test on the selected port's single data
service by sending in-band loop up/down patterns to the far
end.
If a port is selected and there are no local loopback tests
active, then pressing the button will start or stop a BERT
on the selected port.
BERT
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2. CONNECTIONS
The 120 ohm balanced G.703 port uses a RJ-45
connector with the pinouts defined in Table 4. The
G.703 port supports a 2048 Kbps port using a 120
ohm balanced interface that conforms to ITU-T G.703
section 9.
Back Panel Features
The back panel of the Express 6530 SHDSL NxNTU
is illustrated in Figure 3.
The SHDSL port uses a RJ-45 connector with the
interchange circuits and pinouts listed in Table 3.
Nx64K
CUSTOMER
G.703
NETWORK
SHDSL
CONTROL
X.21
V.35 / V.36
V.28
Figure 3. Express 6530 Back Panel
Table 3. SHDSL Pin Connections
Interchange Name
Description
No Connection
SHDSL tip
Pinout
1,2,3
4
N/C
tip
ring
N/C
SHDSL ring
No Connection
5
6,7,8
Table 4. G.703 Pin Connections
Pin Function
1 Receive pair (ring)
2 Receive pair (tip)
3 Receive shield
4
Transmit pair (ring)
5 Transmit pair (tip)
Transmit shield
6
7 NC
8 NC
4
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The local management port is a DB-9 female
connector and is labeled V.28. The interchange
circuits and pinouts are listed in Table 5. The local
management baud rate will auto-detect between 2400
baud and 57600 baud.
See EIA-574, Sec 2.2 and Figure 2.7, with Receive
Data, Transmit Data and Signal Ground only. The
other pins are internally connected to ensure correct
handshaking interoperability. These internal
connections shall be made via resistor traces to
facilitate with future build options.
Table 6 defines the X.21 port pin connections.
Table 5. V.28 Pin Connections
Interchange Name
Description
Pinout
Data Carrier Detect - Internally connected to DTR
and DSR
DCD
1
RXD
TXD
Receive Data
Transmit Data
2
3
Data Terminal Ready - Internally connected to
DCD and DSR
DTR
GND
DSR
4
5
6
Signal Ground
Data Set Ready - Internally connected to DCD
and DTR
RTS
Ready To Send - Internally connected to CTS
7
CTS
NC
Clear To Send - Internally connected to RTS
No Connection
8
9
Table 6. X.21 Pin Connections
Circuit Number Circuit Name
To/From DCE
Pinout (A/B)
G
Ga
T
Signal Ground
8
DTE Common Return
Transmit
15
FROM
TO
2/9
4/11
3/10
5/12
6/13
7/14
1
R
C
I
Receive
Control
FROM
FROM
Indication
S
Signal Element Timing
DTE Signal Element Timing
Shield Ground Option
X
TO
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Table 7 defines the V.35 port pin connections.
Table 7. V.35 Pin Connections
Table 8 defines the V.36 port pin connections.
Circuit Number Circuit Name
To/From DCE
Pinout (A/B)
102
102-3
104
105
106
107
108/2
109
113
114
115
140
141
142
Signal Ground
B
Transmit Data
TO
P/S
R/T
C
Receive Data
FROM
TO
Request to Send
Clear to Send
FROM
FROM
TO
D
Data Set Ready
E
Data Terminal Ready
Received Line Signal Detect
H
FROM
F
Transmit Signal Element Timing TO
Transmit Signal Element Timing FROM
Receive Signal Element Timing
U/W
Y/AA
V/X
N
Remote Loopback
Local Loopback
Test Indicator
TO
TO
L
FROM
NN
Table 8. V.36 Pin Connections
Circuit Number Circuit Name
To/From DCE
Pinout (A/B)
19, 37, 20
4/22
102, 102a, 102b
Signal Ground
Transmit Data
Receive Data
103
104
105
106
107
108/2
109
113
114
115
140
141
142
TO
FROM
TO
6/24
Request to Send
Clear to Send
7/25
FROM
FROM
TO
9/27
Data Set Ready
Data Terminal Ready
11/29
12/30
13/31
17/35
5/23
Received Line Signal Detect
FROM
Transmit Signal Element Timing TO
Transmit Signal Element Timing FROM
Receive Signal Element Timing
Remote Loopback
Local Loopback
FROM
TO
8/26
14
TO
10
Test Indicator
FROM
18
6
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3. OPTIONING
Hardware Optioning
The strap map for the Express 6530 SHDSL NxNTU
is illustrated in Figure 4.
Figure 4. Express 6530 Strap Map
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Software Optioning
The menu tree in Figure 5 illustrates the path to every
provisioning, performance monitoring, and test access
point in the Express 6530 menu system.
8
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1. - 31. G.703 Service
Cross-Connect Map
The selected time slot will carry G.703 service (Refer
to the Full G.703 Services subsection for more
information).
The purpose of the cross-connect map is to allocate
the time slots (TS0s) from the SHDSL loop to user
ports (E1, V.35/X.21) and configure framing. The
cross-connect maps can be accessed via the VT100
terminal screens. Select “1,” Provisioning, from the
Main Menu. Choose to provision the local unit
(Selection 1) or the remote unit (Selection 2). Next,
select “1,” Unit Options, and then “3,” Cross Connect
Map. The cross-connect map is shown in Figure 6.
32. G.704 Framing
This option enables three different framing
configurations. Framing is always set in the first time
slot (TS0). The framing will be locally generated if
32 is entered in the G.703 TS0 slot only. If 32 is
entered in the G.703 TS0 and the SHDSL TS0, then
the framing will be passed transparently between the
G.703 and SHDSL ports. If values other than 32 are
assigned to both the SHDSL TS0 slot and G.703 TS0
slot then the operation is G.703 unframed (if other
G.703 service values are assigned to the G.703 time
slots).
The cross-connect map is split down the middle in two
sections. The left section of the map lists the SHDSL
time slots and right section of the map lists the G.703
time slots. The user builds a new pending map before
making it active with the apply key. The options
listed at the bottom of the screen allow the user to
setup and manipulate the time slots. The statement
under the list of commands indicates the framing
status. Time slot configuration options are defined as
follows:
33. Nx64k Service
The selected time slot will carry Nx64k service. The
value assignment is only valid for the SHDSL time
slots.
0. Idle
A. Apply New Map
If a time slot is set for idle, an idle code is inserted.
The pattern will always be FF hex (all 1s) toward the
SHDSL network.
This command saves and activates any changes made
by the user.
U. Undo New Map
The idle pattern out the G.703 interface is
programmable under the G.703 option. The default is
value FF hex (all 1’s).
This command will undo any changes made by the
user since the last saved configuration. The new
pending map will revert to the currently active time
slot assignments.
Circuit ID:
01-Jan-00 22:03:22
Unit Mode: NT
Provisioning Type: Local
Cross-Connect Map
SHDSL Timeslots
G.703 Timeslots
TS12 = 1
TS13 = 1
TS14 = 1
TS15 = 1
TS16 = 1
TS17 = 1
TS18 = 1
TS19 = 1
TS20 = 1
TS21 = 1
TS22 = 1
TS23 = 1
Commands
TS0 = 32
TS1 = 1
TS2 = 1
TS3 = 1
TS4 = 1
TS5 = 1
TS6 = 1
TS7 = 1
TS8 = 1
TS9 = 1
TS10 = 1
TS11 = 1
TS12 = 1
TS13 = 1
TS14 = 1
TS15 = 1
TS16 = 1
TS17 = 1
TS18 = 1
TS19 = 1
TS20 = 1
TS21 = 1
TS22 = 1
TS23 = 1
TS24 = 1
TS25 = 1
TS26 = 1
TS27 = 1
TS28 = 1
TS29 = 1
TS30 = 1
TS31 = 1
TS32 = N/A
TS33 = N/A
TS34 = N/A
TS35 = N/A
TS0 = 32
TS1 = 1
TS2 = 1
TS3 = 1
TS4 = 1
TS5 = 1
TS6 = 1
TS7 = 1
TS8 = 1
TS9 = 1
TS10 = 1
TS11 = 1
TS24 = 1
TS25 = 1
TS26 = 1
TS27 = 1
TS28 = 1
TS29 = 1
TS30 = 1
TS31 = 1
Timeslot Assignments
0. Idle
1.-31. G.703 Service 1-31
32. G.704 Frame
A. Apply New Map
U. Undo New Map
G. Full G.703 Service
N. Full Nx64K Service
Tab. Select SHDSL or G.703 Timeslots
Arrow Keys. Move Cursor
33. Nx64K Service
G.704 Framing = LT Delivered
Figure 6. Cross-Connect Map
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G. Full G.703 Service
All unused time slots contain a configurable bit
pattern that is set via the management interface. The
default bit pattern is all 1s. Unused time slots are
those which are sent out of the G.703 port, but are not
part of a service. The G.703 port transmits the unused
time slot patterns, and the receive ignores the unused
time slots.
If this quick key command is selected, the cross-
connect map will automatically configure the time
slots for Full G.703 service, and the framing will be
set for transparent. Refer to the Typical Applications
subsection for more information.
N. Full Nx64k Service
If this quick key command is selected, the
cross-connect map will automatically configure the
time slots for full Nx64k service. Refer to the Typical
Applications subsection for more information.
The service values (1-31) correlate to the G.703
Services test options. These options provide the
capability to loopback and test time slots by service
value, so as not to affect other services in surrounding
time slots.
Tab. Select SHDSL or G.703 Timeslots
The tab key moves the cursor between the SHDSL
and G.703 sections of the cross-connect map.
Arrow Keys. Move Cursor
The arrow keys allow movement between the
individual time slots.
G.703 Service Time Slots
A service is comprised of an arbitrary collection of
time slots from the SHDSL interface that shall be
configured via the management interface. Time slot
allocation on an ordered noncontiguous basis is
possible with each time slot within a service having
the same delay. An example is illustrated in Figure 7.
V.35
Nx64k
Port
Nx64k Service
14x64k
V.35
E1 Service 1
(12 x 64k)
E1 Service 2
(10 x 64k)
SHDSL Service
NTU Generated
TS0
E1 Service
E1 Port
Figure 7. Time Slot Allocation
10
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Unframed Full E1 Service is set up using the quick
key “G,” entering “1” in both the SHDSL TS0 slot
and the G.703 TS0 slot, and then selecting “A” to save
the changes. The screen in Figure 9 illustrates a
cross-connect map configured for Unframed Full E1
Service.
Typical Applications
Framed Full E1 Service is set up using the quick key
“G,” and then selecting “A” to save the changes. The
screen in Figure 8 illustrates a cross-connect map
configured for Framed Full E1 Service.
Circuit ID:
01-Jan-00 23:36:38
Unit Mode: NT
Provisioning Type: Local
Cross-Connect Map
SHDSL Timeslots
G.703 Timeslots
TS12 = 1
TS13 = 1
TS14 = 1
TS15 = 1
TS16 = 1
TS17 = 1
TS18 = 1
TS19 = 1
TS20 = 1
TS21 = 1
TS22 = 1
TS23 = 1
Commands
TS0 = 32
TS1 = 1
TS2 = 1
TS3 = 1
TS4 = 1
TS5 = 1
TS6 = 1
TS7 = 1
TS8 = 1
TS9 = 1
TS10 = 1
TS11 = 1
TS12 = 1
TS13 = 1
TS14 = 1
TS15 = 1
TS16 = 1
TS17 = 1
TS18 = 1
TS19 = 1
TS20 = 1
TS21 = 1
TS22 = 1
TS23 = 1
TS24 = 1
TS25 = 1
TS26 = 1
TS27 = 1
TS28 = 1
TS29 = 1
TS30 = 1
TS31 = 1
TS32 = N/A
TS33 = N/A
TS34 = N/A
TS35 = N/A
TS0 = 32
TS1 = 1
TS2 = 1
TS3 = 1
TS4 = 1
TS5 = 1
TS6 = 1
TS7 = 1
TS8 = 1
TS9 = 1
TS10 = 1
TS11 = 1
TS24 = 1
TS25 = 1
TS26 = 1
TS27 = 1
TS28 = 1
TS29 = 1
TS30 = 1
TS31 = 1
Timeslot Assignments
0. Idle
1.-31. G.703 Service 1-31
32. G.704 Frame
A. Apply New Map
U. Undo New Map
G. Full G.703 Service
N. Full Nx64K Service
Tab. Select SHDSL or G.703 Timeslots
Arrow Keys. Move Cursor
33. Nx64K Service
G.704 Framing = N/A
Figure 8. Framed Full E1 Service
Circuit ID:
01-Jan-00 23:40:07
Unit Mode: NT
Provisioning Type: Local
Cross-Connect Map
SHDSL Timeslots
G.703 Timeslots
TS0 = 1
TS1 = 1
TS2 = 1
TS3 = 1
TS4 = 1
TS5 = 1
TS6 = 1
TS7 = 1
TS8 = 1
TS9 = 1
TS10 = 1
TS11 = 1
TS12 = 1
TS13 = 1
TS14 = 1
TS15 = 1
TS16 = 1
TS17 = 1
TS18 = 1
TS19 = 1
TS20 = 1
TS21 = 1
TS22 = 1
TS23 = 1
TS24 = 1
TS25 = 1
TS26 = 1
TS27 = 1
TS28 = 1
TS29 = 1
TS30 = 1
TS31 = 1
TS32 = N/A
TS33 = N/A
TS34 = N/A
TS35 = N/A
TS0 = 1
TS1 = 1
TS2 = 1
TS3 = 1
TS4 = 1
TS5 = 1
TS6 = 1
TS7 = 1
TS8 = 1
TS9 = 1
TS10 = 1
TS11 = 1
TS12 = 1
TS13 = 1
TS14 = 1
TS15 = 1
TS16 = 1
TS17 = 1
TS18 = 1
TS19 = 1
TS20 = 1
TS21 = 1
TS22 = 1
TS23 = 1
TS24 = 1
TS25 = 1
TS26 = 1
TS27 = 1
TS28 = 1
TS29 = 1
TS30 = 1
TS31 = 1
Timeslot Assignments
0. Idle
1.-31. G.703 Service 1-31
32. G.704 Frame
Commands
A. Apply New Map
U. Undo New Map
G. Full G.703 Service
N. Full Nx64K Service
Tab. Select SHDSL or G.703 Timeslots
Arrow Keys. Move Cursor
33. Nx64K Service
G.704 Framing = Unframed
Figure 9. Unframed Full E1 Service
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Full Nx64k 2 Mbps Service is set up using the quick
key “N,” and then selecting “A” to save the changes.
The screen in Figure 10 illustrates a cross-connect
map configured for Full Nx64k 2 Mbps Service.
1. One NTU must be configured as the NT (STU-R)
2. The other NTU must be configured as the LT
(STU-C)
The STU-C and STU-R modes are selected via the
local management port only. The default mode for the
NxNTU is STU-R.
In addition, when setting up Full Nx64k 2 Mbps
Service, the type of line interface must be specified.
V.35, V.36, or X.21 may be selected. To reach this
portion of the menu, select “2,” Provisioning, from the
main menu, and choose the local or the remote unit
provisioning. Select “4,” Nx64k Options, and then
select “2,” Interface Type Manual Select. Finally,
enter the desired line interface.
NOTE
For the LT (STU-C), Network and Customer
direction are opposite of ITU G.991.2
specification definitions. In a back-to-back
configuration,the“Network”directionisalways
toward the SHDSL port and the “Customer”
direction is always away from the SHDSL port
Back-to-Back NTU Operation
The NTU supports back-to-back operation
(Figure 11)
Circuit ID:
01-Jan-00 23:41:06
Unit Mode: NT
Provisioning Type: Local
Cross-Connect Map
SHDSL Timeslots
G.703 Timeslots
TS12 = 0
TS13 = 0
TS14 = 0
TS15 = 0
TS16 = 0
TS17 = 0
TS18 = 0
TS19 = 0
TS20 = 0
TS21 = 0
TS22 = 0
TS23 = 0
Commands
TS0 = 33
TS1 = 33
TS2 = 33
TS3 = 33
TS4 = 33
TS5 = 33
TS6 = 33
TS7 = 33
TS8 = 33
TS9 = 33
TS10 = 33
TS11 = 33
TS12 = 33
TS13 = 33
TS14 = 33
TS15 = 33
TS16 = 33
TS17 = 33
TS18 = 33
TS19 = 33
TS20 = 33
TS21 = 33
TS22 = 33
TS23 = 33
TS24 = 33
TS25 = 33
TS26 = 33
TS27 = 33
TS28 = 33
TS29 = 33
TS30 = 33
TS31 = 33
TS32 = N/A
TS33 = N/A
TS34 = N/A
TS35 = N/A
TS0 = 0
TS1 = 0
TS2 = 0
TS3 = 0
TS4 = 0
TS5 = 0
TS6 = 0
TS7 = 0
TS8 = 0
TS9 = 0
TS10 = 0
TS11 = 0
TS24 = 0
TS25 = 0
TS26 = 0
TS27 = 0
TS28 = 0
TS29 = 0
TS30 = 0
TS31 = 0
Timeslot Assignments
0. Idle
1.-31. G.703 Service 1-31
32. G.704 Frame
A. Apply New Map
U. Undo New Map
G. Full G.703 Service
N. Full Nx64K Service
Tab. Select SHDSL or G.703 Timeslots
Arrow Keys. Move Cursor
33. Nx64K Service
G.704 Framing = Unframed
Figure 10. Full Nx64k 2 Mbps Service
NT (STU-R)
LT (STU-C)
X.21,
V.35 or
V.36
X.21,
V.35 or
V.36
SHDSL NTU
SHDSL NTU
SHDSL
Line
Nx64k
Subscriber
Nx64k
Nx64k
Nx64k
Subscriber
SHDSL
SHDSL
E1
E1
E1
G.703
G.704
E1
G.703
G.704
E1
E1
Local
Management
Port
Subscriber
Subscriber
VT100
Terminal
Figure 11. Back-to-Back NTU Operation
12
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Bit Error Rate Test
Total Elapsed Time – Total time that has elapsed
since the test began (Days: Hours: Minutes: Seconds).
The SHDSL NTU contains a built-in Bit Error Rate
Test (BERT). The BERT involves injecting and
detecting a Pseudorandom Binary Sequence (PRBS)
toward the network on the selected payload (i.e.
G.703, Nx64, or entire SHDSL payload). The PRBS
used in the SHDSL NTU is PRS15 as defined in
ITU-T O.150 and O.151. It is also known as a 2e-15
pattern.
A BERT status field supplies the following
information:
On – The BERT has started and has pattern sync.
Searching for pattern – The BERT has lost pattern
sync.
Off – This BERT is currently off.
The BERT is only accessible via the VT100 terminal
screens. Select “4. Test” from the Main Menu
Screen. From the Test Screen, the SHDSL BERT,
G.703 BERT, and Nx64k BERT options will appear,
and each has one of the following status messages:
Loopbacks
There are five types of local loopbacks and five types
of remote loopbacks available for each of the three
line interfaces (V.35, G.703, and SHDSL). When
initiating a loopback, the first step is choosing a line
interface. When V.35 is chosen, the loopback will
occur at the V.35 drivers and receivers. When G.703
is chosen, the loopback will occur at the G.703 drivers
and receivers. When SHDSL is chosen, the loopback
will occur at the SHDSL drivers and receivers.
N/A – This BERT is currently unavailable. Only one
BERT can be active at a time. For example, if
SHDSL BERT is active, all others will be N/A.
ACTIVE – This BERT is currently in progress. The
source column identifies the person who initiated the
BERT.
INACTIVE – This BERT is not currently in progress.
After selecting a BERT type from the Test Screen, the
BERT Screen will appear, illustrating both BERT
statistics and commands.
NOTE
All remote loopbacks are initiated at the local
Express 6530 unit.
If no BERT is currently active, the following list of
commands will be available:
Local Dual Sided Loopback – Provides a
bidirectional loopback at the NTU (Figure 12).
Start – Starts the BERT on the selected port/service.
If the BERT is currently active, the following list of
commands will be available:
Stop – Stops the BERT in progress.
Inject a Single Bit Error – Injects one bit error into
the pattern.
Figure 12. Local Dual Sided Loopback
Restart – Clears out all statistics and restarts the
BERT.
Remote Dual Sided Loopback – Initiated at the NTU
and provides bidirectional loopback at the LTU
(Figure 13).
In addition to the commands, the following statistical
information is provided:
Bit Error Rate – Total number of bit errors divided
by the total number of bits in the current test interval.
Bit Error Count – Total number of bit errors in the
current test interval.
Pattern Sync Loss Count – Total number of times
that the BERT has lost pattern sync.
Figure 13. Remote Dual Sided Loopback
Errored Seconds – Total number of seconds in which
at least one bit error has occurred.
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Local Customer Transparent Loopback – Provides
a loopback at the NTU in the customer direction
(Figure 14). Data is passed transparently to the
network side.
Local Network Transparent Loopback – Provides a
loopback at the NTU in the network direction (Figure
18). Data is passed transparently to the customer side.
NTU
LTU
NTU
LTU
TX Data
TX Data
Figure 14. Local Customer Transparent
Loopback
Figure 18. Local Network Transparent
Loopback
Remote Network Transparent Loopback – Initiated
at the NTU and provides a loopback at the LTU in the
network direction (Figure 19). Data is passed
transparently to the customer side.
Remote Customer Transparent Loopback –
Initiated at the NTU and provides a loopback at the
LTU in the customer direction (Figure 15). Data is
passed transparently to the network side.
NTU
LTU
NTU
LTU
TX Data
TX Data
Figure 19. Remote Network Transparent
Loopback
Figure 15. Remote Customer Transparent
Loopback
Local Network Nontransparent Loopback –
Provides a loopback at the NTU in the network
direction (Figure 20). AIS signal is injected into the
customer side.
Local Customer Nontransparent Loopback –
Provides a loopback at the NTU in the customer
direction (Figure 16). AIS signal is injected into the
network side.
NTU
LTU
NTU
LTU
TX AIS
TX AIS
Figure 20. Local Network Nontransparent
Loopback
Figure 16. Local Customer Nontransparent
Loopback
Local Network Nontransparent Loopback –
Initiated at the NTU and provides a loopback at the
LTU in the network direction (Figure 21). AIS signal
is injected into the customer side.
Remote Customer Nontransparent Loopback –
Initiated at the NTU and provides a loopback at the
LTU in the customer direction (Figure 17). AIS
signal is injected into the network side.
NTU
LTU
NTU
LTU
TX AIS
TX AIS
Figure 17. Remote Customer Nontransparent
Loopback
Figure 21. Remote Network Nontransparent
Loopback
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Loopbacks may be initiated via the VT100 test
screens, front panel pushbuttons, Nx64K port control
leads, or by receiving V.54 or PN127 in-band looping
signals. Not all loopback types are available for all
ports and port services by all initiating sources. See
Table 9 for an overview. A key to the symbols
displayed in Table 9 is available below the Table.
Table 9. Loopback Overview
Ports
Services
Customer, away
from SHDSL Port (left)
Network, toward SHDSL
Port (right)
SHDSL Port
VT100 Test Screens
Initiating Source
Nx64k Port
G.703 Port
G.704 Service
Nx64k Service
VT100 Loopback On
(Initiates one of five
loopback types,
regardless of the
associated Loopback
Type Option setting.)*
AIS
AIS
AIS
AIS
(Same as
Nx64k Port)
AIS
AIS
AIS
AIS
VT100 Loopback Off
LL Button On
(Initiates a Local
Customer Loopback per
the selected port Loopback
Type Option setting)
Single
service
only
(Same as
Nx64k Port)
AIS
AIS
AIS
AIS
LL Button Off
RL Button On
Single
service
only
Sends
EOC
Request
Message
Sends
In-Band
Patterns
(Initiates a Remote
Network Loopback per
the remote unit’s selected
port Loopback Type
Option setting)*
N/A
(Same as
Nx64k Port)
AIS
AIS
AIS
Sends
In-Band
Patterns
Sends
In-Band
Patterns
Sends
EOC
Request
Message
RL Button Off
Nx64k Port Control Leads
C141 LL On
N/A
N/A
N/A
(Initiates a Local
Customer Loopback
per the Nx64k port
Loopback Type Option
setting)
(Same as
Nx64k Port)
AIS
N/A
N/A
N/A
N/A
N/A
N/A
C141 LL Off
C140 RL On
Sends
In-Band
Patterns
(Initiates a Remote
Network Loopback
per the remote unit
Nx64k port Loopback
Type Option setting)*
(Same as
Nx64k Port)
AIS
C140 RL Off
N/A
N/A
N/A
In-band Looping Protocol Reception
N/A
N/A
Receive In-band
Preparatory Signal
(Applies the loopback
after detection of
AIS
AIS
in-band V.54 or PN127
remote looping pattern
per the associated
service Loopback
Type Option setting)
(Same as
Nx64k Service)
Receive In-band
N/A
N/A
Termination Signal
(Terminates loopback
after detection of
in-band V.54 or PN127
remote looping pattern)
Key:
Dual Loop
Transparent Loop
Nontransparent Loop
No Loop
AIS
* The reception of in-band loopback patterns and EOC loopback request messages may be ignored or blocked on certain
SHDSL LTUs installed in Total Access 3000 Systems
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Multiple Services
When less than 32 time slots are configured on the
G.703 port, the NTU bases the CRC-4 detection/
generation on filling the unused time slots with a fixed
pattern configurable via the management interface.
This CRC-4 detection/generation is also required for
multirate (single or simultaneous services) where less
than 31 G.704 time slots are carried over the SHDSL
line.
The NTU supports the configuration of multiple
services. These services are routed to either the
G.703/G.704 interface or the Nx64k interface. The
Nx64k interface supports a single service with
1 <= N <= 36. The G.703 interface (with G.704
framing) supports multiple services (often termed
“Stacked E1”). The G.703 interface without any
framing supports a single 2048 kBit/s service. (See
ITU-T G991.2 Annex. E.1-TPS-TC for European
2048 kbit/s digital Unstructured Leased Line
(D2048U).)
NOTE
All framed services operate in aligned mode.
The Nx64k service and G.703 service are capable of
operating simultaneously. The total number of time
slots must be less than or equal to the maximum
number of SHDSL time slots (excluding TS0 if
structured E1 is used). The G.703 interface with
framing (G.704) runs over SHDSL in aligned mode
and supports simultaneous services using the Nx64k
port for the second service. (See ITU-T G991-2
Annex E.7 - TPS-TC for Aligned European 2048
kbit/s digital Structured Leased Line (D2048S) and
Fractional.)
Operation
The SHDSL NTU supports multiple rate line
operation as specified in ITU-T G.991.2. All services
described in this document operate in multiple rate
mode, with a corresponding change in maximum
payload. Unstructured E1 is supported for SHDSL
rates equal to 32 and with all G.703 time slot
assignments equal to the same G.703 service value
(1 to 31).
The G.703 interface supports operation in the
following modes that are selectable via the
management interface:
The SHDSL NTU supports CRC-4 detection/
generation toward the SHDSL network (Figure 22).
The CRC-4 detection/generation can operate in the
following modes (configurable via the management
interface):
1. Framed
2. Framed pass through
3. Unframed
1. CRC-4 detection/generation disabled
2. CRC-4 detection/generation enabled
Nx64k Service
SHDSL Time Slots
E1 Service
Figure 22. CRC-4 Detection/Generation
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The NTU provides framing on the E1 port as
When the NTU is configured for an unframed service
the only alarm available is LOS. Consequential
actions can only be undertaken if G.704 framing is
either delivered by the remote unit or is being
described in G.704 (sections 2.3 and 5) and G.706
(section 4) and G.736. In this mode, the data arriving
at the SHDSL interface need not contain any G.704
framing and the NTU generates the framing. One or
more services can be routed into time slots 1-31.
generated on the NTU. If framing is being generated
by the LT then the LT is responsible for these actions.
CRC-4 multiframe may be enabled or disabled. The
default is disabled. The NTU routes one or more
services from the SHDSL payload into time slots
1-31, as well as routing time slot 0. In this mode
G.704 framing is present in the data arriving on the
SHDSL interface, and this is passed transparently to
the G.703 interface.
While any of the alarm states LOS, AIS, LOF,
LOMFA and BER are detected, the following
consequential actions will occur:
1. The remote alarm indication (bit 3 of the TS0
B- word) will be set as described in the G.704,
G.726 and G.706;
2. The G.703/G.704 alarm LED will be on,
3. AIS will be transmitted toward the network in all
corresponding data time slots.
NOTE
Not all time slots are necessarily routed between
the SHDSL and G.703 interface – some may be
routed from the SHDSL to the Nx64k interface.
See the CRC-4 Multiframe subsection.
NOTE
RAI assertion by the NTU can be disabled (the
defaultstate)undertheG.703OptionsScreenby
the Customer RAI generation option.
The NTU monitors the G.704 framing to detect errors
(and thus drive the NTU LEDs) and to determine the
value of the TS0 spare bits. The NTU transfers all
SHDSL payload time slots transparently through the
G.703 port without framing or monitoring. In this
mode the port operates as a 2 Mbit/s G.703 interface
without any G.704 framing. This implies that the
whole SHDSL payload comprises a single service.
When remote alarm indication is detected, the alarm
condition will be displayed on the front panel.
The following alarm conditions can be monitored on
the G.703/G.704 interface (if applicable to the current
configuration):
1. AIS (Alarm Indication Signal)
2. BER (Excessive Bit Error Rate)
3. LOMFA (Loss of Multi-Frame Alignment)
4. LOF (Loss of Frame)
5. LOS (Loss of Signal)
6. RAI (Remote Alarm Indication)
7. Slip
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4. SPECIFICATIONS
Table 10 lists the specifications for the Express 6530
SHDSL NxNTU.
Table 10. Express 6530 SHDSL NxNTU Specifications
Network Interface
Line Rate:. ............................................................ SHDSL per ITU G.991.2
Line Code: ............................................................ TC PAM
Connector: ............................................................ RJ-45
DSL Timing: ........................................................ Network, Internal, and DTE
DTE Interface (DIGITAL)
Bit Rate: ............................................................... 64 kbps to 2.304 Mbps (Nx64 kbps)
Connectors: .......................................................... CCITT V.35/V.36 (M34 Female Connector) CCITT X.21 (DB15 Female Connector)
DTE Interface (E1)
Bit Rate: ............................................................... 2.048 Mbps
Connector: ............................................................ RJ-45, 120 ohm Balanced Interface
Framing: ............................................................... G.703 (CCS) CRC-4 (enable/disable) Unframed
Craft Port
Bit Rate: ............................................................... 2.4 kbps to 38.4 kbps
Connector: ............................................................ DB-9, Female, V.28
Agency Approvals: K.20, K.21, CISPER 22, IEC 950, CE MARK
Environment
Operating: ............................................................. 0°C to 50°C (32°F to 122°F)
Storage: ................................................................ -20°C to 70°C (-4°F to 158°F)
Relative Humidity: ............................................... Up to 95%, noncondensing
Physical
Dimensions:.......................................................... 1.5 in. H, 9.0 in. W, 6.25 in. D (38.1 mm H, 228.6 mm W, 158.75 mm D)
Weight: ................................................................. 2 lbs.
Power:................................................................... 90-240 V, 50-60 Hz, 5 W or -48 VDC
Power Connector:................................................. IEC 60320 C13
18
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5. WARRANTY AND CUSTOMER SERVICE
Asia Pacific-Beijing, China
8610-8857-6415 voice
ADTRAN will replace or repair this product within
the warranty period if it does not meet its published
specifications or fails while in service. Warranty
information can be found at
8610-8857-6417 fax
Asia Pacific-Hong Kong
852-2824-8283 voice
USA and Canadian customers can also receive a copy
of the warranty via ADTRAN’s toll free faxback
server, 877-457-5007.
852-2824-8928 fax
Carrier Networks Warranty - Document 414.
Enterprise Networks Warranty - Document 901.
Asia Pacific-Melbourne, Australia
61-3-9658-0500 voice
61-3-9658-0599 fax
Contact Customer and Product Service (CAPS) prior
to returning equipment to ADTRAN.
Europe / Middle East / Africa
49-6172-483-2304 voice Germany
256-963-8695 voice - USA
For service, CAPS requests, or further information,
contact one of the following numbers:
International Customer and Product Service
Contact Numbers
49-6172-483-2305 fax
ADTRAN, Inc.
Latin America / Caribbean
954-474-4424 voice - USA
256-963-8695 voice - USA
Attention: International Department
901 Explorer Boulevard
Huntsville, Alabama 35806
USA
954-474-1298 fax - USA
Mexico
954-474-4424 voice - USA
U.S. Headquarters
256-963-8695 voice - USA
256-963-8000 voice
800-923-8726 voice
954-474-1298 fax
- USA
256-963-6300 fax
256-963-8200 fax back
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