Comtech EF Data CDM-570 - Manual (Page 69)

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Rear Panel Connectors and Pinouts MN/CDM570L.IOM
3–5
3.3.2 G.703 Connections
3.3.2.1 G.703 Balanced E1/T1 Interface Connector, DB-15F
The G.703 Balanced E1/T1 connection is a 15-pin ‘D’ type female (DB-15F)
connector used for balanced operation at the G.703 data rates of E1 (2.048
Mbps) or T1 (1.544 Mbps).
Table 3-3. Balanced G.703 Interface Connector Pin Assignments
Pin # Signal Function Name Direction
1 Tx G.703 - Tx G.703 In In
9 Tx G.703 + Tx G.703 In In
2 Ground GND
3 Rx G.703 - Rx G.703 Out Out
11 Rx G.703 + Rx G.703 Out Out
4 Ground GND
Pins 5, 6, 7, 8, 10, 12, 13, 14 and 15 are not used.