CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Rear Panel Connectors and Pinouts MN/CDM570L.IOM
3–6
3.3.2.2 G.703 E1/T1 RJ-48 Connection via G.703 Balanced Interface
Connector
The optional CN-0000268 Adapter, shown in 21Figure 3-2, may be purchased from Comtech EF
Data to adapt the G.703 Balanced E1/T1 DB-15F connector for E1/T1 operation via an RJ-48
female user interface.
CN-0000268 Adapter Pin Assignments
Pin #
Signal Name
RJ-48 (User Side) DB-15M (Modem Side)
1 9 Tx+
2 1 Tx-
3 2 GND
4 11 Rx+
5 3 Rx-
6 4 GND
Pins 7 and 8 on the RJ-48 side, and pins 5-8, 10, and 12-15 on the
DB-15 side, are not used.
Figure 3-2. CN-0000268 DB-15M Æ RJ-48F Adapter for E1/T1 Operation
3.3.2.3 G.703 Unbalanced Interface Connectors (Tx/Rx), 75Ω BNC
Two female 75Ω BNC connectors are provided for unbalanced operation at the
G.703 data rates of E1 (2.048 Mbps):
BNC Connector Description Direction
Unbal E1 Out Rx G.703 (Unbalanced E1) Out
Unbal E1 In Tx G.703 (Unbalanced E1) In
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