Comtech EF Data CDM-700 - Manual (Page 50)

CDM-700 High Speed Satellite Modem Revision 5
Connector Pinouts MN/CDM700.IOM
5.1.4 ASYNC Connector Pinout – J6 (Rev. A and Later Chassis)
The J6 ASYNC Channel interface is a 9-pin, Type D female connector.
Pin # Description Direction
1 Ground
2 RS-232 Transmit Data Out
3 RS-232 Receive Data In
4 Not Used
5 Not Used
6 RS-485 Receive Data B * In
7 RS-485 Receive Data A * In
8 RS-485 Transmit Data B Out
9 RS-485 Transmit Data A Out
* Use for 2-wire RS-485 operation.
5.1.5 External Reference Input (Main Chassis) – J7
The J7 Ext Ref (External Reference) input is used to supply a master reference to the
entire chassis. The clocks on the Framer Card and the Modulator and Demodulator
Synthesizers are locked to this input, when it is used:
•
Female SMA connector (on the initially released chassis)
•
BNC female connector (on the Rev A or later chassis)
Some data interfaces have an Ext-Clk input for synchronizing the data sources. Refer to the
individual data interface card on the Data Interfaces appendix for details.
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