Comtech EF Data CDM-425, Installation And Operation Manual

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CDM-425 Advanced Satellite Modem
Revision 0
Rear Panel Connectors and Pinouts 3–6 MN-CDM-425
3.2.1 IF Connection Group
WARNING! THERE MAY BE DC VOLTAGES, UP TO A MAXIMUM OF 48 VOLTS,
PRESENT ON THE TYPE ‘N’ RX AND TX IF CONNECTORS.
3.2.1.1 Rx IF Connectors
Connector Type Description Direction
Type ‘N’ Rx IF signal, L- band
In
BNC Rx IF signal, 70/140 MHz band
3.2.1.2 Tx IF Connectors
Connector Type Description Direction
Type ‘N’ Tx IF signal, L- band
Out
BNC Tx IF signal, 70/140 MHz band
3.2.2 Terrestrial Data Connection Group
3.2.2.1 Data Interface (DB-25F)
The Data Interface connector is a 25-pin, Type ‘D’ female interface that
conducts data input and output signals to and from the modem, and
connects to customer’s terrestrial equipment, breakout panel, or
protection switch.
Table 3-2. Data Interface Connector Pinouts
(R>L)
Pin #
Generic Signal Description Direction
EIA-422
EIA 530
V.35 HSSI LVDS
Circuit
#
13 Clear to Send B * Modem to DTE CS B – – – 106
25 (NOTE 2)
12 Internal Transmit Clock B Modem to DTE ST B SCT B ST B ST B 114
24 Transmit Clock A DTE to Modem TT A SCTE A TT A TT A 113
11 Transmit Clock B DTE to Modem TT B SCTE B TT B TT B 113
23 (NOTE 2)
10 Receiver Ready B
Modem to DTE RR B – CA B RR B 109