M&C 10/100Baset Connector; 485/232 Connector; Tx And Rx If Connectors; Ext Ref Connector - Comtech EF Data CDM-Qx Installation And Operation Manual

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier®
Rear Panel Connectors
3.2.3 M&C 10/100BaseT Connector
3.2.4

485/232 Connector

Table 3-2. 485/232 (Remote Control) Connector Pin Assignments

Pin #
1
2
3
4
5
6
7
8
9
*Use for 2-wire RS-485 operation
3.2.5

Tx and Rx IF Connectors

The type of IF connectors available depends on the configuration ordered. The following reflects
the configurations available:
70/140 MHz
There may be DC voltages present on the Type 'N' Rx and Tx IF connectors, up
to a maximum of 48 volts.
CA UTIO N
3.2.6

Ext Ref Connector

The Ref connector is a Type 'BNC' female 50Ω connector, standard on all configurations as shown
in Sect. 3.2.5 (above). It provides an external reference input for the Tx and Rx IF synthesizers and
for the internal transmit clock. The load impedance is 60.4Ω, so the VSWR is less than 1.25:1 at
The M&C 10/100BaseT connector is an 8-pin RJ-45 10/100BaseT Ethernet
port providing access to the modem's management functions. A green LED
lights to acknowledge data traffic.
The 485/232 connector is a 9-pin 'D' type male (DB-9M). Access is provided to
remote control ports of the modem, using both EIA-232 and EIA-485.
Description
Ground
RS-232 TX Data
RS-232 RX Data
Reserved - do not connect to this pin
Ground
RS-485 RX Data B *
RS-485 RX Data A *
RS-485 TX Data B
RS-485 TX Data A
L-Band
Tx and Rx:
•
CDM-Qx (70/140 MHz) – BNC 75Ω
•
CDM-QxL (L-Band) – Type 'N' 50Ω
3–5
Revision 7
MN/CDMQX.IOM
Direction
Out
In
In
In
Out
Out