Comtech EF Data CDS-100 - Manual (Page 44)

CDS-100 Diversity Switch MN-CDS100
Modem and Switch Configuration Revision 1
4–4
See the CDM-625A or CDM625 Advanced Satellite Modem Installation and Operation
Manual (CEFD P/N MN-CDM625A or MN-CDM625) for instructions to configure one of
the four 10/100 Ethernet ports for each modem for remote Ethernet M&C.
4.2.2 Configure Carrier-in-Carrier® for Diversity Switching
The Pre-Mapped Symbol Interface (PMSI) is associated with DoubleTalk ® Carrier-in-Carrier ® . It
permits the modulator in a selected unit to provide a direct copy of its output (the outbound
interferer) to the second modem. The other modem may then choose to take the PMSI signal
and use it for its own CnC reference. In diversity switching, the PMSI is an EIA-485 multi-drop
bus system where one device transmits and the other device on the multi-drop bus is configured
to receive.
If you use Carrier-in-Carrier ® (CnC), you must configure the CnC control setting to Redundancy
mode using the CDM-625/A front panel menus.
Do these steps to configure the CnC control setting for CDM-625/A Diversity Switching:
Step Task
1 From the top-level SELECT: menu, use the ◄► arrow and ENTER keys until the PMSI control
mode screen appears:
SELECT: Configuration  CnC  PMSI-control
CnC PMSI mode: Redundancy
(Idle, Redundancy, Talk, Listen) (
)
Use the ▲ ▼ arrow keys to select Redundancy, and then press ENTER.
2 The two modems will now need to be connected together via use of a 1:1 PMSI cable (note that
this cable bypasses the CDS-100).
• Chapter 5. CABLES
AND CONNECTIONS
• Appendix A. CABLE DRAWINGS