Mocomtech CDM-QX - Manual (Page 52)

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7
Rear Panel Connectors MN/CDMQX.IOM
3–2
On the next page, Table 3-1 summarizes the connectors provided on the rear panel for both the
base chassis and the optional data interfaces, grouped according to service function.
Note the following:
1. One interface per Modem (i.e. Modulator and Demodulator card combination) or one
interface per Modulator card and Demodulator card are required if used independently.
2. When grouping a modulator and demodulator together to use as a modem, the modulator
must be located above the demodulator.
3. For redundant operation the backup unit does not need an interface.
4. For redundant operation the backup unit needs to be located in the lower right hand slot
(Slot #4) for single module redundancy. For modem redundancy the backup units must be
located in the right hand slots (Slots #3 & #4).
5. For the example shown for Configuration #1, because all modules have interfaces, the
following configurations are possible:
a. Two independent modulators - one with a G.703 balanced and the other with an EIA-
530 interface, with two independent demodulators one with a G.703 balanced and the
other with an EIA-530 interface.
b. Two independent modems - one with a G.703 balanced and the other with an EIA-
530 interface (located on the demodulators).
c. A 1:1 redundant modem, with the online unit configured with a G.703 interface. The
off line modules will provide the backup even with a different interface.
6. For the example shown for Configuration #3, the Quad E1 Interface Module is used in
Slots #3 and #4. The modulator in Slot 1 is grouped with the demodulator in Slot 2. This
unique combination allows the user to select the Quad E1 interface or the data interface
located in the modulator or demodulator.