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Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected by Patton’s qualified tech-
nicians. If any questions or problems arise during installation or use of
this product, please do not hesitate to contact Patton Electronics
Technical Support at (301) 975-1007.
2.1 FEATURES
• Synchronous network data rate of 2.048 Mbps
• Four Selectable DTE Rates: 256, 512, 1024, and 2048 Kbps
• EIA-530 (EIA-422 Electrical), V.35, or X.21 terminal interfaces
• 120 ohm (twisted pair) or 75 ohm (coax) network terminations
• Master and Slave (network) clocking
• Built-in local loopback test
• Front panel LED indicators for power, network,
master clock and test loop
• Mounts in Patton’s 16-slot rack chassis and 2/4/8-slot Cluster
Boxes
• Made in the U.S.A.
2.2 DESCRIPTION
The Patton
MegaLink™ Model 2703RC-A G.703/E1rack card
modem receives unstructured, synchronous 2.048 Mbps data from a
G.703 network and sends it to a router, bridge, multiplexer or other
device. The Model 2703RC-A is available with two interface options:
120 Ohm twisted pair to the network with EIA-530 (EIA-422) or V.35
(utilizing a 25 pin connector) to the terminal, or 75 Ohm dual coax to
the network with X.21 to the terminal. An additional feature allows the
EIA-530 terminal interface to be adapted to X.21 using a special DTE
cable (available from Patton).
The Model 2703RC-A is designed to mount in Patton’s 2U high, 16-
slot rack chassis or 2/4/8-slot Cluster Boxes. These have a switchable
120/240 VAC power supply (optional 48 VDC) and mount cards in a
mid-plane architecture: front “function” cards and rear “interface” cards
can be hot-swapped independently, providing great flexibility. The
Model 2703RC-A supports Internal (master) and Network (slave) clock-
ing. Loopback test is built-in, and front panel LEDs monitor power, net-
work, master clock and test loop.
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Two cards make up a single Model 2703RC-A G.703 Converter - a
front function card and a rear interface card. Each may require config-
uration depending upon the product application. This section
describes the location and orientation of the Model 2703RC-A’s config-
uration switches and jumpers, and provides descriptions for all set-
tings.
3.1 FRONT CARD CONFIGURATION
The Model 2703RC-A front card has a single bank of eight DIP
switches located on the top of the printed circuit board. Figure 1,
below, shows the position of the switches on the board.
Changing the DIP Switch Settings
Figure 2 shows the orientation of the DIP switches with respect to the
“ON” and “OFF” positions.
4
Figure 1. Model 2703RC-A board, showing switch locations
DIP Switch
OFF
ON
1
8
Figure 2. Close up of the configuration switches
NOTE: The OFF position is oriented toward the front of the Model 2703RC-A
OFF
ON
Front Panel
