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CRS-180 70/140 MHz IF 1:1 Redundancy Switch
Modem and Switch Configuration
3.2.2
Carrier-in-Carrier® Redundancy Configuration
If Carrier‐in‐Carrier
using the CDM‐625 front panel menus.
Configuration of the CnC control setting for CDM‐625 1:1 Redundancy is as follows:
Step
Procedure
From the top-level SELECT: menu, navigate each menu level using the ◄► arrow keys and
1
the ENTER key until the PMSI control mode screen appears as follows:
SELECT: Configuration
From the CnC PMSI mode screen, use the ▲ ▼ arrow keys to select Redundancy, and then
press ENTER.
2
The two CDM-625s will now need to be connected together via use of a 1:1 PMSI cable (note
that this cable bypasses the CRS-180).
The Pre-Mapped Symbol Interface (PMSI) is a function associated with DoubleTalk
in-Carrier
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 this 1:1 redundancy, the PMSI is an
RS-485 multi-drop bus system where one device transmits and the other device on the multi-
drop bus is configured to receive.
®
(CnC) is utilized, the CnC control setting must be set to Redundancy mode
CnC
CnC PMSI mode: Redundancy
(Idle, Redundancy, Talk, Listen)
Chapter 4. CABLES AND CONNECTIONS.
that permits the modulator in a selected unit to provide a direct copy of its output (the
®
PMSI-control
3–4
Revision 8
MN/CRS180.IOM
(v)
Carrier-
®
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