Product specifications

CDM-710 Broadcast Satellite Modem Revision 11
Rear Panel Connectors and Pinouts MN/CDM710.IOM
3–5
P1 Notes :
1. The relays have low voltage contacts with transient suppressors across each pin
to ground. The Summary Relay combines Tx, Rx, and Unit Faults into a single
relay.
2. The maximum working voltage is 18VDC or 13VAC. The maximum current
rating is 1 Amp DC or 0.5 Amp AC.
3.4.2 Remote Port Connector (RS-232/-485), P2
The P2 Remote port connector is a 9-pin Type ‘D’ male (DB-9M) interface with
threaded jack nuts. It is intended for connection to an M&C computer or terminal
device, and is user selectable for either RS-232 or RS-485.The connector pinout is as
follows:
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
3.4.3 External Reference Input, J7
The 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. Note that some data interfaces have an Ext-Clk input for synchronizing
the data sources. Observe the following:
Initially released chassis:
SMA Female connector
Rev. A and later chassis:
BNC Female connector