USER
MANUAL
MODEL 2702
G.703 Interface Converter
Part# 07M2702-UM
Doc# 08605U2-003
Rev. C
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
Copyright © 2006
Patton Electronics Company
All Rights Reserved.
C
E
R
T
I
F
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D
Revised 10/26/06
An ISO-9001
Certified Company
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1.2 RADIO AND TV INTERFERENCE
1.4 SERVICE INFORMATION
The Model 2702 generates and uses radio frequency energy, and
if not installed and used properly-that is, in strict accordance with the
manufacturer's instructions-may cause interference to radio and televi-
sion reception. The Model 2702 has been tested and found to comply
with the limits for a Class A computing device in accordance with the
specifications in Subpart J of Part 15 of FCC rules, which are designed
to provide reasonable protection from such interference in a commer-
cial installation. However, there is no guarantee that interference will
not occur in a particular installation. If the Model 2702 does cause
interference to radio or television reception, which can be determined
by disconnecting the cables, the user is encouraged to try to correct
the interference by one or more of the following measures: moving the
computing equipment away from the receiver, re-orienting the receiving
antenna, and/or plugging the receiving equipment into a different AC
outlet (such that the computing equipment and receiver are on different
branches).
All warranty and non-warranty repairs must be returned freight
prepaid and insured to Patton Electronics. All returns must have a
Return Materials Authorization number on the outside of the shipping
container. This number may be obtained from Patton Electronics
Technical Support at:
tel: (301) 975-1007;
email: [email protected]
NOTE: Packages received without an RMA number will not be
accepted.
Patton Electronics' technical staff is also available to answer any
questions that might arise concerning the installation or use of your
Patton Model 2702. Technical Services hours: 8AM to 5PM EST,
Monday through Friday.
1.3 CE AND TELECOMMUNICATION APPROVALS
The CE symbol on your Patton Electronics equipment indicates
that it is in compliance with the Electromagnetic Compatibility (EMC)
directive and the Low Voltage Directive (LVD) of the Union European
(EU). A Certificate of Compliance is available by contacting Technical
Support.
The Model 2702 is in compliance with the Telecommunication
technical requirements CRT-12; 2.048 Mbps digital unstructured
leased line (D2048U) attachment requirements for terminal equipment
interface.
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2.0 GENERAL INFORMATION
2.3 SUPPORTED APPLICATIONS
Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is warrant-
ed for One Year parts and labor. If any questions arise during installa-
tion or use of the unit, contact Patton Electronics Technical Services at
(301) 975-1007.
The Model 2702 provides a E1 network termination between E1
and customer premises equipment (CPE) such as a router. The Model
2702 can also be used as a high-speed short haul modem for campus
applications.
2.3.1 The 2702 as the Interface between the Telco and CPE
2.1 FEATURES
The Model 2702 provides the interface between an E1 multiplexer
and a router or switch (See below).
• Converts Synchronous unframed 2 Mbps G.703 to V.35
• Integral V.35 (M/34) Male connector (6 Pin Cisco router also
available)
• V.54 Compliant Loopback Diagnostics
• Easy to Read LEDs for TXD, RSD, ALM, LOTC, TST, and ERR
• AMI or HDB3 Line Coding
• Configuration via DIP Switches
• External 100-240VAC Power Supply
E1/FE1
from
LAN
Model 2702
Internet
64kbps to
2.042Mbps
DACS
Service Provider’s Network
MUX
2.2 GENERAL PRODUCT DESCRIPTION
Customer Site
The Patton Model 2702 fits into an environment where high-speed
E1/G.703 services are being offered to customers with Router/FRADS
and other networking devices. These G.703 Interface Converters are
required to convert signals from the unstructured, synchronous line
interface - delivered by the carrier - to a 2 Mbps digital interface
required by the users networking equipment.
2.3.2 The 2702 as a High-Speed Short Range Modem
The Model 2702 can also be installed into high-speed campus
applications. In this application, a pair of Model 2702 units operate as
short range modems (See below).
To accomplish this, the Model 2702 presents a RJ48C interface to
the line and a V.35 interface to the customer’s device. The V.35 inter-
face is presented using a Male M/34 connector. Line coding and clock
options may be selected using internally accessible DIP Switches
Model 2702
Model 2702
Customer Site
Service Provider’s Network
If other interfaces are required, you may select our Model 2703 con-
verter which presents the following interfaces: X.21, RS422/530,
V.36/RS449 and V.24/RS232. These interfaces are delivered through a
standard interface cable which connects to the Female DB25 on one
end and the desired interface on the other end. If other DTE speeds
are necessary, our Model 2094 connects Fractional E1 at nx64 speeds
up to 2 Mbps. Please see the interface converter section of the Patton
Catalogue for the required converter.
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3.0 CONFIGURATION
SWITCH SET SUMMARY TABLE
The Model 2702 features configuration capability via hardware
switches . This section describes all possible hardware switch configu-
rations of the Model 2702.
Position
SW1
Function
Line Coding
Clock Mode
Factory Default Selected Option
Off
Off
HDB3
SW3
Network
SW4
Clock Mode
Off
3.1 DIP SWITCH CONFIGURATION
NOTE: Switches SW2, SW5, SW6, SW7, and SW8 are not used.
Switch SW1: Line Coding
The Model 2702 has eight internal DIP switches that allow configu-
ration for a wide range of applications. The eight switches are
accessed by opening the plastic case with a small screwdriver. Figure
1 (below) shows the location of the DIP switches on the bottom of the
printed circuit board.
Use Switch SW1 to control the Network Line Coding options. Set
these options to be the same as the Line Coding given to you by your
Service Provider. If you are using two Model 2702s together as short
range modems, set both units identically.
DIP Switches
SW4
Off
On
Line Framing & Coding
HDB3
AMI
ON
OFF
Line Coding Options:
High Density Bipolar 3 (HDB3): In HDB3 coding, the transmitter
deliberately inserts a bipolar violation when excessive zeros
in the data stream are detected. The receiver recognizes
these special violations and decodes them as zeros. This
method enables the network to meet minimum pulse density
requirements. Use HDB3 unless AMI is required in your
application .
Figure 1. Model 2702 bottom view, showing location of DIP switches
The Model 2702 DIP switches (SW1, SW3 & SW4) can be config-
ured as either “On” or “Off”. Figure 2 (below) shows the orientation of
the DIP switches with respect to ON/OFF positions.
Alternate Mark Inversion (AMI): AMI coding does not inherently
account for ones density. To meet this requirement, the user
should ensure that the data inherently meets pulse density
requirements.
ON
OFF
Figure 2. Close up of DIP switches showing ON/OFF positions.
Default positions for Switches SW1, SW3, and SW4 are shown in
the table on the following page. Descriptions of each switch follow the
table.
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4.0 INSTALLATION
Switch SW3 and SW4: Clock Mode
The Model 2702 is equipped with DTE, network, and power interfaces.
This section briefly describes connection to each.
SW3 is used to along with SW4 to determine the clock mode. For
example the Model 2702 can be set to external clock mode by setting
both SW3 and SW4 to the on position. Please refer to the Clock Mode
chart below for the desired settings.
4.1 DTE INTERFACE CONNECTION
The DTE/DCE interface is a V.35 DCE presented as an M/34 male
connector. This interface is designed to plug directly into a DTE inter-
face (See Appendix D for V.35 interface pin assignments).
CLOCK MODE SETTINGS
SW3
SW4
Clock Mode
4.2 NETWORK INTERFACE CONNECTION
Off
Off
On
On
Off
On
On
Off
Network (Default)
Internal
The Network Line Interface is an eight position keyed modular jack
configured as a RJ-48C. This interface will need to be configured to
match the line parameters (i.e. framing, line coding, etc.) supplied by
the central office.
External
Network
RJ-48C Jack
Signal Name
CLOCK MODES
1
2
3
4
5
6
7
8
(RX) Receive (Ring)
(RX) Receive (Tip)
Shield
(TX) Transmit (Ring)
(TX) Transmit (Tip)
Shield
1
2
3
4
5
6
7
8
Network Clock Transmitter timing is derived from the received line
signal.
Internal Clock Transmitter clock is derived from an internal clock
source
No connection
No connection
External Clock Transmitter timing is derived from the local DTE
device. A 2.048 MHz timing signal must be present a
at the external clock pin U and pin W on the M/34
connector.
Figure 3. Model 2702 twisted pair line interface.
NOTE: If the Model 2702 is being used for private short range
modem applications, the twisted pair cable connected to its port
will need to be a cross-over cable, and should be configured as
shown below. See Appendix D for Interface pin assignments.
Note: When using the 2702 as a high-speed short range modem, one
unit of the link must be configured in either internal or external clock,
and the other end must be configured for network clock mode, or both
units could be either Internal or External Clock. But both units cannot
be network clock mode in SRM applications
SIGNAL
PIN NO.
PIN NO.
SIGNAL
1
2
4
5
4
5
1
2
TX Data (Tip)
TX Data (Ring)
RX Data (Ring)
RX Data (Tip)
RX Data (Ring)
RX Data (Tip)
TX Data (Ring)
TX Data (Tip)
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5.0 OPERATION
4.3 POWER CONNECTION
Once the Model 2702 is installed and configured properly it is
ready to place into operation. This section describes the function of
the LED indicators, and the use of the loopback.
The Model 2702 offers three ways to supply external power: AC
power, DC power and interface power.
4.3.1 Using the AC Power Supply (100-240VAC)
5.1 LED DESCRIPTIONS
The Model 2702 uses a 5VDC, 400mA universal input 100-
240VAC, power supply (center pin is +5V). The universal input power
supply is equipped with a male IEC-320 power entry connector. This
power supply connects to the Model 2702 by means of a barrel jack on
the rear panel. There are a variety of international power cords avail-
able for the universal power supply. The Model 2702 powers up as
soon as it is plugged into an AC outlet–there is no power switch.
The Model 2702 is equipped with seven LED indicators that moni-
tor the status of communication. Figure 4 (below) shows the location
of the LEDs on the Model 2702 front panel.
4.3.2 Supplying DC Power
The 36-60 VDC DC to DC adapter is supplied with the DC version
of the Model 2702. The black and red leads plug into a DC source
(nominal 48VDC) and the barrel power connector plugs into the barrel
power supply jack on the 2702.
TXD
RXD
LOS
ALM
To Power
To -48VDC
Supply Jack
ERR
T/L
Source
-Vin
Black lead (-V)
Red lead (+V)
PWR
+Vin
Barrel power connector
4.3.3 Supplying Power via pin KK
Figure 4. Top of Model 2702, Showing LED Indicators
You may also supply DC power directly to pin KK of the V.35 inter-
face. DC Power supplied to pin KK must be regulated 5VDC ± 5%,
300mA minimum.
TXD
RXD
When the unit sends a one, the TXD LED
is turned on. When it sends a zero, the
TXD LED is turned off. Moreover, the TXD
LED is active only in active DS0 channels.
In inactive channels, the TXD LED is off.
NOTE: Model 2702 is factory configured to accept power from the
enclosed DC wall adapter (See Sections 4.3.1 and 4.3.2 above).
If you wish to supply power via pin KK on the interface, you must
change the setting of the power supply jumper on the printed cir-
cuit board See Appendix E. All power sources must be SELV
(Circuit, Safety Extra Low Voltage) specified. (See CENELEC
EN60950, Section 1.2.8.5)
When the unit receives a one, the RXD
LED is turned on. When it receives a zero,
the RXD LED is turned off. Moreover, the
RXD LED is active only in active DS0 chan-
nels. In inactive channels, the RXD LED is
off.
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LOTC
ALM
The Loss of Transmit Clock LED lights
when
the unit detects that there is no transmit
clock.
5.2.2 Operating Remote Digital Loopback (RL)
The Remote Digital Loopback (RL) test checks the performance of
both the local and remote Model 2702, as well as the communication
link between them. To perform a RDL test, follow the steps below.
The alarm LED indicates the loss of carrier,
i.e., no activity on the network.
1. Activate the “RL” signal on the DTE pin N. If you are not sure
which lead is the “RL” signal, please refer to Appendix D.
ERR
TST
The error LED is not used in Model 2702.
2. Perform a bit error rate test (BERT) or using a separate BER
Tester. If the BER test indicates a fault, and the Local Line
Loopback test was successful for both NetLink™s, you may
have a problem with the twisted pair line connection.
The test indicator LED blinks with a specific
pattern depending on the type of test mode.
When the unit is in local analog loop, the
LED will blink on briefly. When the unit is in
remote loop, the TST LED will blink off
briefly. The test mode is V.54 Loopback &
Local loopback.
PWR
The power indicator LED will remain lit while
the unit is powered. It turns off when the
unit is not powered.
5.2 LOOP (V.54 & TELCO) DIAGNOSTICS
The Model 2702 offers two V.54 loop diagnostics and is compati-
ble with two Telco loop diagnostics. Use these diagnostics to test the
NTU and any communication links. These tests can be activated via
signals on the DTE interface.
5.2.1 Operating Local Loopback (LL)
The Local Loopback (LL) test checks the operation of the local
Model 2702, and is performed separately on each unit. Any data sent
to the local Model 2702 in this mode will be echoed (returned) back to
the user device. To perform a LL test, follow the steps below.
1. Activate the “LL” signal on the DTE pin L. If you are not sure
which lead is the “LL” signal, please refer to Appendix D.
2. Verify that the data terminal equipment is operating properly
and can be used for a test.
3. Perform a V.52 BER (bit error rate) test. If the BER test equip-
ment indicates no faults, but the data terminal indicates a
fault, follow the manufacturer’s checkout procedures for the
data terminal. Also, check the interface cable between the
terminal and the Model 2702.
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APPENDIX A
PATTON MODEL 2702
SPECIFICATIONS
APPENDIX B
PATTON MODEL 2702
CABLE RECOMMENDATIONS
+
Network Data Rate:
Network Connector:
Nominal Impedance:
2.048 Mbps 50ppm
The Patton Model 2702 has been performance tested by Patton
technicians using twisted-pair cable with the following characteristics:
RJ-48C
120 ohm (75 ohm available when using
Wire Gauge
Capacitance
Resistance
Patton Model 460 Balun)
V.35 (DCE Orientation) on Male M/34
Selectable AMI or HDB3
DTE/DCE Interface:
Line Coding:
Line Framing:
Clocking:
19 AWG
22 AWG
24 AWG
83nf/mi or 15.72 pf/ft.
83nf/mi or 15.72 pf/ft.
83nf/mi or 15.72 pf/ft.
.0163 Ohms/ft.
.0326 Ohms/ft.
.05165 Ohms/ft.
G.703 (Unframed)
Network, Internal, External (from DTE)
2.048 Mbps
To gain optimum performance from the Model 2702 , please keep
the following guidelines in mind:
DTE Data Rates:
Diagnostics:
Indicators:
• Always use twisted pair wire—this is not an option.
V.54 Loopback & Local Loopback
Power, Transmit Data, Receive Data,
Alarm, Loss of Tx Clock, Test Mode,
Error
• Use twisted pair wire with a capacitance of 20pf/ft or less.
• Avoid twisted pair wire thinner than 26 AWG (i.e. avoid AWG
numbers higher than 26)
Configuration:
Power:
8-Position DIP Switch
+
Regulated 5VDC 5%, 300 mA mini-
• Use of twisted pair with a resistance greater than the above
specifications may cause a reduction in maximum distance obtain-
able. Functionality should not be affected.
mum
Humidity:
Up to 90% non-condensing
0 to 50o C
• Many environmental factors can affect the maximum distance
obtainable at a particular site. Use the above data rate/distance
table as a general guideline only.
Temperature:
Dimensions:
4.8”L x 2.0”W x 0.88”H (12.2 x 5.1 x 2.2
cm)
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APPENDIX C
APPENDIX D
PATTON MODEL 2702
PATTON MODEL 2702
INTERFACE PIN ASSIGNMENT
FACTORY REPLACEMENT PARTS
AND ACCESSORIES
RJ-48C E1 Network Interface
(RJ-48S Female Modular Jack)
Patton Model #
Description
2702/CM/UI .....................V.35 to E1 Converter (V.35 M/34 Male,
UI)
Pin #
Signal
10 - 09F...........................6 Foot Control Port Cable, 25 mm to
1
2
4
5
RX Data (RING)
RX Data (TIP)
TX Data (RING)
TX Data (TIP)
DB9F
07M2702 .........................User Manual
08055DCUI......................Universal Input Power Supply
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APPENDIX D
(continued)
APPENDIX E
PATTON MODEL 2702
POWER SUPPLY INTERFACE
PATTON MODEL 2702
INTERFACE PIN ASSIGNMENT
M/34 Connector, Terminal Interface
Via Main 5VDC power jack (J1)
Center Pin:
Outer Barrel:
Barrel Plug:
5VDC @ 300 mA
Ground
Pin #
A
Signal
2.1/5.5/10mm I.D./O.D./Shaft Length dimensions.
GND (Earth Ground/Shield)
B
SGND (Signal Ground)
Jumper Position for Power via DC Power Jack (default):
D
CTS (DCE Source)
E
F
DSR (DCE Source, Always On)
CD (DCE Source)
L
M
N
P
R
S
T
U
V
W
X
Y
AA
KK
LL (Local Loop, DTE Source)
TM (Test Mode Indicator (DCE Source)
RL (Remote Loop, DTE Source)
TD (Transmit Data +, DTE Source)
RD (Receive Data +, DCE Source)
TD/ (Transmit Data -, DTE Source)
RD/ (Receive Data -, DCE Source)
SCTE (Transmit Clock+, DTE Source)
RC (Receiver Clock +, DCE Source)
SCTE/ (Transmit Clock-, DTE Source)
RC/ (Receiver Clock -, DCE Source)
TC (Transmitter Clock +, DCE Source)
TC/ (Transmitter Clock -, DCE Source)
Aux. Power Input (+5VDC @ 300mA)
Via Auxiliary Power Supplied to Pin KK on V.35 connector
DC Power supplied to pin KK must be 5VDC ± 5%, 300mA minimum.
Jumper Position for Power via Pin KK:
NOTE: Model 2702 is factory configured to accept power from the
enclosed DC wall adapter (See Sections 4.3.1 and 4.3.2 above).
If you wish to supply power via pin KK on the interface, you must
change the setting of the power supply jumper on the printed cir-
cuit board. All power sources must be SELV (Circuit, Safety Extra
Low Voltage) specified. (See CENELEC EN60950, Section
1.2.8.5)
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