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CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier®
Rear Panel Connectors
3.3.2
Balanced G.703 Connector Tx/Rx Connector
duplex. This feature allows a single data interface connection to be used for a modem instead of
needing a "Y" cable. Otherwise, each module is a simplex data interface.
Table 3-4. Balanced G.703 Interface Connector Pin Assignments
Pin #
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
3.3.3
Unbalanced G.703 Tx/Rx Connectors
allowing duplex operation. Otherwise, the Tx data input connector is used on the modulator and
the Rx data output connector is used on the demodulator.
The Balanced G.703 connection is a 15-pin 'D' type female (DB-15F)
connector located on the rear mounting plate of the modulator or
demodulator. If a Modulator and Demodulator are vertically grouped together
as a modem, the data interface connector on the Demodulator switches to
Signal Function
Drop Data Input ( - )
Drop Data Input (+)
Ground
Not Used
Insert Data Output ( - )
Insert Data Output (+)
Ground
Drop Data Output ( - )
Drop Data Output (+)
Insert Data Input ( - )
Insert Data Input (+)
Not Used
Not Used
Not Used
Not Used
Two female BNC 75Ω connectors are available for unbalanced operation at the
G.703 data rates of T1 (1.544 Mbps), E1 (2.048 Mbps), and E2 (8.448 Mbps).
If a Modulator and Demodulator are vertically grouped together as a modem,
the Tx data input interface connector on the Demodulator becomes active,
Name
DDI–
DDI+
GND
IDO–
IDO+
GND
DDO–
DDO+
IDI–
IDI+
3–7
Revision 7
MN/CDMQX.IOM
Direction
In
In
Out
Out
Out (D&I Only)
Out (D&I Only)
In (D&I Only)
In (D&I Only)
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