Comtech EF Data CRS-300 - RMI;TMI Limitations and Considerations; Control Cable Connections

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CRS-300 1:10 Redundancy Switch MN/CRS300.IOM

Cables and Connections Revision 19

4–42

4.6 SLM-5650/5650A Modem Connections

If adding a modem to an operating 1:N system, care needs to be taken not to interfere with the

existing Traffic Modem. The cabling, power-up sequence, and communication connections must

be correct to avoid contention in the system from the modem Tx carrier. This information is

detailed in Sect. 6.2.2.5 CONFIG: ACTIVE (Activate Modems)

4.6.1 RMI/TMI Limitations and Considerations

Some consideration must be made when choosing which TMIs can be mixed within the same

Switch. Because the Switch RMIs (CRS-306/-307) cannot provide connections to all of the data

types on the SLM-5650/5650A Redundant Modem, the customer must choose which RMI card is

the best choice for use with the Switch. This will then dictate which TMIs that the Switch can

support.

You must equip your Redundant Modem with the same option card(s) as any

Traffic Modem.

2) The Switch TMIs feature jumpers that are pre-set to ensure proper operation

with

the following traffic data:

• For EIA-422 with RTS/CTS, DTR/DSR signals using the CRS-316

• For HSSI with CA/TA signals using the CRS-336

See Chapter 5. MODEM, TMI, AND SWITCH CONFIGURATION for this important

configuration information.

3) When you use the SLM-5650/5650A with the Switch, the modem is NOT

compatible for use in a Vipersat network.

4) Modems using a single port (i.e., Port 1) of the 4-Port Network Processor

Module can NOT be mixed with modems using EIA-530 or HSSI data interfaces,

or the G.703 or single port Gigabit Ethernet card options.

4.6.2 Control Cable Connections – CRS-300 to Modems

The Control Cable CA/WR12136-1 provides the serial communication path between the Switch

and the modems and controls the modem’s external Tx IF-mute control line. You must always

use this cable.

To provide user access to the AGC and I&Q outputs of the modem, the CA/WR12842-6 Control

Y-Cable, sold separately, is available for use in place of the CA/WR12136-1 cable. See Appendix

B. CABLE DRAWINGS for detailed information about these optional cable assemblies.

See Figure 4-16 through Figure 4-18 and do these steps to connect and secure the

CA/WR12136-1 cable (or the CA/WR12482-6 Control Y-Cable, if used) between the Switch and

each SLM-5650/5650A:

Comtech EF Data CRS-300 - RMI;TMI Limitations and Considerations; Control Cable Connections - CRS-300 to Modems