user manual

CDM-600 Satellite Modem Revision 7

Physical Description MN/CDM600.IOM

4–5

4.3.12 IDI, DDO Connectors (J10A and J11A)

Two additional female BNC 75Ω connectors for unbalanced operation at the G.703 data

rate of E1 (2.048 Mbps). These are the Insert Data In (IDI) and Drop Data Out (DDO)

port.

An alternative use for these ports is for sub-rate G.703 auxiliary operation on modems

with hardware revision 2.0 or higher. This permits operation at the additional rates of 512

and 1024 kbps. In this mode, IDI serves as the TX terrestrial input port, and DDO as the

output port.

4.3.13 Unbalanced G.703 Tx/Rx (J10B and J11B)

Two female BNC 75Ω connectors for unbalanced operation at the G.703 data rates of E1

(2.048 Mbps), T2 (6.312 Mbps), or E2 (8448 kbps).

4.3.14 External Frequency Reference Connector (J12)

This is an SMA female connector. It is an optional connector used to permit the

connection of a high-stability external reference signal.