Comtech EF Data CDM-600/600L - Manual (Page 68)

CDM-600/600L Open Network Satellite Modem Revision 3
Rear Panel Connector Pinouts MN/CDM600L.IOM
3–8
3.3.4.3 J10B Rx and J11B Tx Unbalanced G.703 Connectors, 75Ω BNC
Two 75
Ω BNC female connectors are provided for unbalanced operation
at the G.703 data rates of E1 (2.048 Mbps), T2 (6.312 Mbps), or E2
(8448 kbps).
BNC Connector Description Direction
J10B Rx Rx G.703 (Unbalanced E1) Out
J11B Tx Tx G.703 (Unbalanced E1) In
3.4 Utility Connections
3.4.1 P6 Aux Serial Receptacle, USB Type ‘B’
The USB Type ‘B’ P6 Aux Serial receptacle is is an additional RS-232 serial
port, which is only used when the modem is part of a 1:1 redundant pair.
WARNING
Although this port uses a USB connector, the signals are
not USB compatible.
DO NOT connect this port to the USB port of a PC or other computing device.
P6 Aux Serial Receptacle (USB Type ‘B’)
Pin # Description Direction
1 Ground --
2 RS-232 TX Data Out
3 RS-232 RX Data In
4 Ground --
3.4.2 J9 Ext Clk (CDM-600L) / Ext Ref (CDM-600), 50Ω BNC
This is 50
Ω BNC female connector is used for operating the buffer with an
external station clock for the CDM-600L, or an external station reference for
the CDM-600. It requires an RS-422 compatible level, so this unbalanced
input should have a zero volt offset and a swing of at least
±2V into the
120
Ω termination provided.
Modem BNC Connector Description Direction
CDM-600L J9 Ext Clk External Clock Input In
CDM-600 J9 Ext Ref External Baseband Input In