Patton electronic Network Card 2703 X21 User Manual

USER  
MANUAL  
MODEL 2703-X21  
G.703/E1 Digital Modem  
SALES OFFICE  
(301) 975-1000  
TECHNICAL SUPPORT  
(301) 975-1007  
Part# 07M2703-X21-C  
Doc# 031111UC  
Revised 6/19/98  
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An ISO-9001  
Certified Company  
 
3.0 CONFIGURATION  
Switch Set S1  
The configuration switches on S1 set clocking, rate adaptation,  
loopback enable, and data invert. The default settings are  
summarized in the table below.  
The Model 2703-X21 is equipped with one DIP set containing eight  
switches (externally accessible), as well as seven jumpers (internal).  
These switches and jumpers allow configuration of clocking, data rate,  
and test options. The Model 2703-X21 is also equipped with an internal  
switch that allows selection of 115 or 230 VAC power inputs (Note: this  
switch is not present in Models 2703-X21-UI and 2703-X21-DC). This  
section describes switch and jumper locations and explains all possible  
configurations.  
S1 SUMMARY TABLE  
Position  
S1-1  
S1-2  
S1-3  
S1-4  
S1-5  
S1-6  
S1-7  
S1-8  
Function  
Clock Master/Slave  
Rate Adaptation  
Rate Adaptation  
Test Enable  
Factory Default  
On  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Master  
3.1 EXTERNAL DIP SWITCH SETTINGS  
2.048 Mbps  
}
The Model 2703-X21’s DIP switch set is located on the underside  
of the unit (see Figure 1, below). Figure 2 (below), shows the  
orientation of the switch set. All possible settings for the Model 2703-  
X21’s switches are presented in the summary table and descriptions on  
the following pages. If you have additional questions regarding  
configuration, contact Patton Technical Support at (301) 975-1000.  
Front Panel  
Not Inverted  
N/A  
Data Inversion  
Not Used  
Not Used  
N/A  
Not Used  
N/A  
S1-1: Master/Slave Clock  
The setting for switch S1-1 determines whether the Model 2703-  
X21 provides the master clock, or is slaved to another clock source.  
S1  
S1-1  
On  
Off  
Setting  
Model 2703-X21 is master  
Model 2703-X21 is slave, (clock is recovered  
from the network)  
Figure 1. Underside of Model 2703, showing external DIP switch location  
ON  
O N  
1 2 3 4 5 6 7 8  
1 2  
OFF  
3
4
5
6
7
8
OFF  
Figure 2. Close up of configuration switches  
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S1-2 and S1-3: Rate Adaptation  
3.2 INTERNAL JUMPER SETTINGS  
Switches S1-2 and S1-3 are set in combination to allow the Model  
2703-X21 to adapt to terminal devices running at data rates of less than  
2.048 Mbps (The network rate remains 2.048 Mbps regardless of the  
terminal rate adaptation setting). The setting you select should match  
the data rate of your terminal device.  
The Model 2703-X21’s seven jumpers are located on the PC board  
inside the unit. To access the jumpers, follow these instructions:  
1. Insert a flat head screw driver into an open slot on either side  
of the case, as in Figure 3. Twist the screw driver head slightly  
and the top half of the case will separate from the lower half,  
as in Figure 4, below.  
S1-2  
Off  
S1-3  
Off  
Setting  
2.048 Mbps  
1.024 Mbps  
512 kbps  
256 kbps  
On  
Off  
2. Remove the Network Interface Module by lifting gently upward  
on it until it comes free from the Model 2703-X21 main PC  
board.  
Off  
On  
On  
On  
NOTE: Revision B Firmware (or newer, Implemented 6/19/98)  
has been adopted to correct signal polarity at 1.024 Mbps, 512  
kbps, and 256kbps. To operate Revision B Firmware units with  
Revision A (or older) units at one of these sub-rates, you must  
invert invert the data (Switch S1-5 On. See Below) (Firmware  
revision level is printed on the label on the bottom of the unit).  
3. Slide out the Network Interface Module and locate the jumpers  
on the bottom side of the board.  
4. Configure the jumpers according to the section below and  
return the Network Interface Module and cover to their proper  
positions.  
S1-4: Loopback Test Enable  
Depending upon the setting of switch S1-4 the Model 2703-X21 will  
either be continually in loopback mode, or loopback mode will be  
enabled by pressing and holding the front panel switch. Since the  
front panel switch is spring loaded–it returns to “Normal” operation  
when pressure is released–this DIP switch provides a way of leaving  
the Model 2703-X21 in “unattended” loopback mode for remote test  
purposes.  
Figure 3. Opening the 2703 Case with a Small Screwdriver  
S1-4  
On  
Off  
Setting  
Continual “unattended” loopback mode  
Loopback activation by front panel switch  
S1-5: Data Inversion  
The setting for switch S1-5 determines whether or not the data  
stream from the local DTE is inverted within the Model 2703-X21 before  
being passed to the G.703 network. The ability to invert the data  
stream may be necessary when the Model 2703-X21 is being used with  
an embedded G.703 device that inverts the data on the remote end.  
Normally, data inversion is not necessary.  
Figure 4. Opening the 2703 Case With a Small Screwdriver  
S1-5  
On  
Off  
Setting  
Data inverted  
Data not inverted  
The internal jumpers mounted on the Model 2703-X21’s PC board  
(labeled LK1 - LK7) are used to configure the 75 ohm or 120 ohm  
network link parameters. Figure 5 (below) shows the location of the  
Model 2703’s jumpers on the internal PC board.  
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S1-6, S1-7 & S1-8 Not Used  
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LK1: 75 Ohm Transmit Shield-to-Ground Connection  
This setting determines whether the shield of the 75 Ohm (coax)  
transmit cable is connected to earth ground. This connection must be  
made when operating in 75 Ohm (unbalanced) mode. Conversely, this  
connection must not be made when operating in 120 Ohm (balanced)  
mode.  
LK2  
LK6  
LK7  
LK5  
LK3  
LK1  
Strap On  
Strap Off  
Setting  
75 Ohm TX Shield-to-GND Connection Made  
75 Ohm TX Shield-to-GND Connection Broken  
LK2: 75 Ohm Receive Shield-to-Ground Connection  
LK4  
LK1  
This setting determines whether the shield of the 75 Ohm (coax)  
receive cable is connected to earth ground. This connection is optional  
when operating in 75 Ohm (unbalanced) mode. This connection must  
not be made when operating in 120 Ohm (balanced) mode.  
Figure 5. Jumper locations on Model 2703 PC board.  
LK2  
Strap On  
Strap Off  
Setting  
The table below shows the factory default jumper settings.  
Following the table are descriptions for each jumper.  
75 Ohm RX Shield-to-GND Connection Made  
75 Ohm RX Shield-to-GND Connection Broken  
JUMPER SUMMARY TABLE  
Jumper  
Function  
75 ohm 120 ohm Factory Default  
LK3: DIP Switch S1-1 Enable  
LK1  
75 Ohm TX Shield to GND  
On  
Off  
Off  
On (connect)  
Off (disconnect)  
Off  
This strap is reserved for future use and must remain Off.  
LK2 75 Ohm RX Shield to GND Opt.*  
LK3  
Setting  
LK3  
LK4  
LK5  
LK6  
LK7  
Reserved  
Strap On  
Strap Off  
Not a Valid Setting  
Normal Setting  
120 Ohm Shield to GND  
Configuration Auto-Sense  
75 Ohm Input Impedance  
75 Ohm Input Impedance  
Off  
On  
On  
On  
Opt.  
Opt.  
Off  
Off (disconnect)  
On (enabled)  
LK4: 120 Ohm Shield-to-Ground Connection  
On (75 Ohm)  
}
Off  
This setting determines whether the shield of the 120 Ohm  
(modular) cable is connected to earth ground. This connection is  
optional when operating in 120 Ohm (balanced) mode. This connection  
must not be made when operating in 75 Ohm (unbalanced) mode.  
*Opt. = optional setting, all others are required for proper operation  
NOTE: one combination of jumper settings is required for 75 ohm  
operation, and another combination is required for 120 ohm  
operation. The Model 2703 is factory configured for 75 ohm  
operation.)  
LK4  
Setting  
Strap On  
Strap Off  
75 Ohm RX Shield-to-GND Connection Made  
75 Ohm RX Shield-to-GND Connection Broken  
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LK5: Configuration Auto-Sense  
3.3 POWER SUPPLY OPTIONS  
This setting determines whether the host can automatically sense  
the configuration of the Applique. The operation of the Applique is not  
affected by this jumper setting. Auto-sense should be enabled when  
operating in 75 Ohm (unbalanced) mode. Current interface standards  
do not list this feature for 120 Ohm (balanced) mode.  
The Model 2703-X21 is available with three power supply options:  
The Standard power supply option (Model 2703-X21 or 2703-X21-  
230) is factory configured for either 115 or 230 VAC, depending on  
how the product is ordered, and is available with a variety of  
domestic and international power cords (see Appendix C).  
LK5  
Strap On  
Strap Off  
Setting  
Auto-sense enabled  
Auto-sense disabled  
The Universal Interface power supply option (Model 2703-X21-UI)  
operates in environments ranging from 85 to 265 VAC, with no re-  
configuration necessary (see Appendix C for available domestic  
and international power cords).  
LK6 & LK7: 75 Ohm Termination Impedance  
The DC power supply option (Model 2703-X21-DC) operates in 48  
VDC environments and is equipped with a 3-pin “terminal strip”  
style DC power cord.  
This jumper sets the termination impedance correctly for 75 Ohm  
operation. Both jumpers must be in place when operating in 75 Ohm  
(unbalanced) mode. Conversely, both jumpers must be removed when  
operating in 120 Ohm (balanced) mode.  
LK6  
On  
Off  
LK7  
On  
Off  
Setting  
75 ohm operation  
120 ohm operation  
WARNING! There are no user-serviceable parts in the  
power supply section of the Model 2703-X21. Voltage  
setting changes and fuse replacement should only be  
performed by qualified service personnel. Contact  
Patton Electronics Technical support at (301)975-1007 for  
more information.  
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4.0 INSTALLATION  
4.2 CONNECTION TO THE TERMINAL DEVICE  
Once the Model 2703-X21 is properly configured, it is ready to  
connect to your system. This section tells you how to properly connect  
the Model 2703-X21 to the G.703 network and terminal device  
interfaces.  
The Model 2703-X21 is wired as a DCE, and–when configured  
properly–supports communication with an X.21 DTE device. The Model  
2703-X21 is equipped with a DB-15 female connector and uses a  
standard X.21 patch cable, wired straight through. If you wish to  
construct your own terminal adapter cable, please consult the pinout  
diagram in Appendix B.  
4.1 CONNECTION TO THE G.703 NETWORK  
The Model 2703-X21 supports 2.048 Mbps communication over an  
unstructured G.703 network. Both 120 ohm twisted pair and 75 ohm  
coax interfaces are provided on the rear panel of the Model 2703-X21  
(see Figure 6, below). Be sure the unit is configured properly to operate  
in either 120 ohm or 75 ohm mode, and that the network connection is  
grounded appropriately (see Section 3.0).  
4.3 CONNECTION TO THE POWER SOURCE  
As described in Section 3.3, the Model 2703-X21 is available with  
three power supply options: two AC and one DC. The two AC power  
supply options (Standard and Universal) use a female IEC power cord  
interface, for which Patton can supply various domestic and  
international power cords. Please refer to Appendix C for specific  
Patton part numbers when ordering power cords. The DC power  
supply option uses a 3-pin terminal strip interface (Note: Please refer  
to the Model 2703-X21 Service Manual for DC power supply wiring  
instructions).  
(Model 2703-X21-DC has terminal strip)  
Network  
DTE Interface  
Figure 6. Model 2703 rear panel  
4.1.1 Twisted Pair (120 OHM) Connection  
The Model 2703-X21 is equipped with a single RJ-45 jack for  
connection to a 120 ohm twisted pair G.703 network interface. The  
pinout of this jack is as follows:  
RJ-45 Pins  
SIGNAL  
1 & 2 . . . . . . . . . . . . Receive pair (from network)  
3. . . . . . . . . . . . . . . . Shield reference point  
4 & 5 . . . . . . . . . . . . Transmit pair (to network)  
6. . . . . . . . . . . . . . . . Shield reference point  
7. . . . . . . . . . . . . . . . Not used  
8. . . . . . . . . . . . . . . . Not used  
4.1.2 Dual Coax BNC (75 OHM) Connection  
In addition to the 120 ohm twisted pair connection, the Model 2703-  
X21 is equipped with dual female BNCs (TX and RX) for connection to  
a 75 ohm dual coax G.703 network interface. The outer conductor of  
the coax cables is isolated from system earth ground.  
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5.0 OPERATION  
5.3 LOOPBACK TEST (LAL)  
Once the Model 2703-X21 is properly configured and installed, it  
should operate transparently. This sections describes power-up,  
reading the LED status monitors, and using the built-in loopback test  
modes.  
The Model 2703-X21 is equipped with a Local Analog Loopback  
(LAL) mode to assist in evaluating the operation of the local Model  
2703-X21. Any data sent to the local Model 2703-X21 in this test mode  
will be echoed (returned) back to the user device. For example,  
characters typed on the keyboard of a terminal will appear on the  
terminal screen. To perform a LAL test, follow these steps:  
5.1 POWER-UP  
To apply power to the Model 2703-X21, first be sure that you have  
read Section 3.3, and that the unit has the proper voltage setting and  
fuse. Failure to do so could result in damage to the unit and connected  
equipment, and may constitute a fire hazard. Having checked the  
voltage setting, plug the AC power cord into both the Model 2703-X21  
and the AC outlet. Then Power-up the unit using the rear Power switch.  
Note: the “PWR” LED should glow when power is applied to the unit.  
A. Activate LAL by moving the front panel toggle switch UP and  
holding it in the “Loopback” mode. The “Loop” LED should glow. Once  
LAL is activated, the Model 2703-X21 transmit output is connected to its  
own receiver.  
Note: The front panel switch is spring loaded, so it will return to  
“Normal” operating mode when pressure is released. To put the Model  
2703-X21 in continual loopback mode, for the purpose of performing a  
BER test, move DIP switch S1-4 to the “ON” position (see Section 3.1).  
5.2 LED STATUS INDICATORS  
B. Verify that the data terminal equipment is operating properly  
and can be used for a test. If a fault is indicated, call a technician or  
replace the unit.  
The Model 2703-X21 features four front panel LEDs that indicate  
the status of power, network connection, master clock and loopback  
test. Figure 7 (below) shows the front panel location of each LED.  
Following Figure 7 is a description of each LED’s function.  
C. Perform a BER (bit error rate) test on each unit. If the BER test  
equipment 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  
2703-X21.  
Model 2703 MegaLink-1 G.703/E1 Modem/Converter 2.048 Mbps  
Test Modes  
Loop  
Loopback  
Normal  
Figure 7. Model 2703 Front Panel  
Power -  
Glows red when the Model 2703-X21 is  
powered up.  
Network -  
Glows green when the Model 2703-X21 is receiving  
correctly encoded data from the line interface  
equipment.  
Master Clock-  
Loop -  
Glows green when the Model 2703-X21 is  
configured as the master clock unit.  
Glows green when the Model 2703-X21 is in  
loopback mode.  
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APPENDIX A  
APPENDIX B  
MODEL 2703-X21 PIN CONFIGURATIONS  
PATTON MODEL 2703 SPECIFICATIONS  
CCITT X.21 INTERFACE (DB-15)  
Network Interface:  
G.703  
Network Rate:  
2.048 Mbps  
Network Connectors:  
Two BNC (75 Ohm) and one  
modular RJ-45 connector (120  
Ohm)  
1- Frame Ground  
2- Transmit - A  
3- Control - A  
4- Receive - A  
Transmit - B - 9  
Control - B -10  
Terminal Interface:  
Terminal Rate:  
X.21 on female DB-15 connector  
2.048 Mbps, 1.024 Mbps, 512 kbps  
or 256 kbps  
Receive - B -11  
Indication - B -12  
5- In ic io  
d
a
t
n
-
A
Signal Timing -B 13  
6- Signal Timing - A  
Diagnostics:  
Indicators:  
Loopback Test  
4  
5  
LEDs for power, network, master  
clock and loopback test  
Internal (Master) or Network  
Recovered (Slave) clock  
-10 dB (0dB = 2.4V)  
85/265 VAC (switch selectable),  
50/60 Hz; 85-265 VAC, 50/60 Hz  
(universal input option); 48 VDC  
(option)  
8- Signal Ground  
Clocking:  
Receiver Sensitivity:  
Power:  
Temperature Range:  
Altitude:  
Humidity:  
0-50°C (32-122°F)  
0-15,000 feet  
5 to 95% noncondensing  
7.3” x 6.6” x 1.62” (185mm x  
168mm x 41mm)  
Dimensions:  
Weight:  
2.02 lbs.  
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APPENDIX C  
FACTORY PARTS AND ACCESSORIES  
APPENDIX D  
SAFETY WARNINGS AND REQUIREMENTS  
C-1 Basic Standalone Units  
These warning notices apply to the Input Port, the port marked  
“Network”.  
The Patton Model 2703-X21 standalone digital modem is available  
in three versions, depending upon the power supply installed. The  
Standard and Universal Interface versions are supplied with a power  
cord, which must be specified in the model number when ordering. The  
DC version is supplied without power cord.  
Warning: The port marked “SAFETY WARNING: see instructions  
for use” does not provide isolation sufficient to satisfy the requirements  
of BS6301; apparatus connected directly to this port should either have  
been approved to BS6301 or have previously been evaluated against  
British Telecommunications plc (Post Office) Technical Guides 2 or 26  
and given permission to attach. Any other usage will invalidate the  
approval of the Interface Module.  
All versions of the Model 2703-X21 are supplied without a terminal  
(DTE) interface cable. This cable may be ordered separately, or may  
be supplied by the user.  
Interconnection of the Interface Module (the port marked  
“Network”) directly, or by way of any other apparatus, with ports on  
other apparatus (marked or not so marked) may produce hazardous  
conditions on the network. Users should seek advice from a competent  
engineer before such a connection is made.  
Standard power supply option,  
switchable between 115 and 230 VAC ......................Model 2703-X21/*  
Universal Interface power supply option,  
operates in environments ranging from  
85 to 265 VAC.......................................................Model 2703-X21-UI/*  
The Interface Module is approved as a Host Independent Appliqué.  
As such the Interface Module is only approved for use with a host, and  
with host attachments, that are either type approved in their own right,  
or, if supplied after March, 1989, are covered by terms of the General  
Approval number NS/G/1234/J/100003. A Host supplied under the  
terms of the General Approval number NS/G/1234/J/100003 satisfies  
the conditions of the paragraph above.  
DC power supply option,  
operates in 48 VDC environments,  
equipped with a 3-pin “terminal strip”  
for DC power connection.......................................Model 2703-X21-DC  
C-2 AC Power Cords  
The Interface Module must not be modified in any way. Any form  
of modification invalidates the approval for connection, and the Patton  
warranty of the unit.  
Power cord must be specified when ordering Models 2703-X21 or  
2703-X21-UI. If power cord is omitted, suffix “K” will be assigned.  
Ordering Suffix (*)  
Power Cord Description  
The terms of the approval require that there must be a minimum  
distance (5mm) between the Interface Module and any other part of the  
host, including other Interface Modules. This condition is met by default  
when the Appliquè is installed in a Patton enclosure in accordance with  
the instructions. If voltages greater than 250V are present in the host ,  
users should refer to a competent safety engineer for advice.  
A.....................................Continental Europe, CEE 7  
C.....................................Australia, New Zealand  
D.....................................United Kingdom  
E.....................................Denmark  
F .....................................France/Belgium  
G.....................................India  
H.....................................Israel  
I ......................................Italy  
J......................................Japan  
K.....................................North America  
L .....................................Switzerland  
It is a condition of the approval that a copy of these user  
instructions and safety warnings must be supplied with the host.  
Failure to provide the Interface Module user instructions with the host  
will invalidate the Appliquè approval.  
Failure to install the Interface Module in accordance with these  
instructions will invalidate the approval. If you experience difficulties, or  
are in any doubt, please contact your Patton representative.  
Example: 2703-X21-UI/D = Universal Interface w/ UK power cord.  
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