If Connection Group; Rx If Connectors; Tx If Connectors; Terrestrial Data Connection Group - Comtech EF Data CDM-425 Installation And Operation Manual

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

3.2.1.2

Tx IF Connectors

3.2.2

Terrestrial Data Connection Group

3.2.2.1

Data Interface (DB-25F)

(R>L)
Generic Signal Description
Pin #
13 Clear to Send B *
25 (NOTE 2)
12 Internal Transmit Clock B
24 Transmit Clock A
11 Transmit Clock B
23 (NOTE 2)
10 Receiver Ready B
Rear Panel Connectors and Pinouts
Connector Type
Type 'N'
BNC
Connector Type
Type 'N'
BNC
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

Direction
Modem to DTE
Modem to DTE
DTE to Modem
DTE to Modem
Modem to DTE
3–6
CDM-425 Advanced Satellite Modem
Description
Rx IF signal, L- band
Rx IF signal, 70/140 MHz band
Description
Tx IF signal, L- band
Tx IF signal, 70/140 MHz band
EIA-422
V.35
EIA 530
CS B –
ST B SCT B
TT A SCTE A
TT B SCTE B
RR B –
Revision 0
Direction
In
Direction
Out
Circuit
HSSI LVDS
#
– – 106
ST B ST B 114
TT A TT A 113
TT B TT B 113
CA B RR B 109
MN-CDM-425