Mocomtech CDM-QX - Manual (Page 55)

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7
Rear Panel Connectors MN/CDMQX.IOM
3–5
CA UTIO N
3.2.3 M&C 10/100BaseT Connector
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.
3.2.4 485/232 Connector
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.
Table 3-2. 485/232 (Remote Control) Connector Pin Assignments
Pin # Description Direction
1 Ground
2 RS-232 TX Data Out
3 RS-232 RX Data In
4 Reserved - do not connect to this pin
5 Ground
6 RS-485 RX Data B * In
7 RS-485 RX Data A * In
8 RS-485 TX Data B Out
9 RS-485 TX Data A Out
*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:
There may be DC voltages present on the Type ‘N’ Rx and Tx IF connectors, up
to a maximum of 48 volts.
3.2.6 Ext Ref Connector
The Ref connector is a Type ‘BNC’ female 50
Ω 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 60.4
Ω, so the VSWR is less than 1.25:1 at
70/140 MHz L-Band
Tx and Rx:
• CDM-Qx (70/140 MHz) – BNC 75Ω
• CDM-QxL (L-Band) – Type ‘N’ 50Ω