Carrier-In-Carrier® Redundancy Configuration - Comtech EF Data CRS-170A Installation And Operation Manual

CRS-170A L-Band 1:1 Redundancy Switch
Modem and Switch Configuration
Dedicated Management Port Mode is not configurable for use when the optional IP
Packet Processor is installed and enabled. With the IP Packet Processor enabled, as a
means to avoid Ethernet Networking Loops, only one of the CDM-625's four 10/100
Ethernet Ports is used for each modem at any given time.
3.2.2 Carrier-in-Carrier® Redundancy Configuration
If Carrier-in-Carrier
using the CDM-625/A front panel menus.
Configuration of the CnC control setting for CDM-625/A 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  CnC  PMSI-control
From the CnC PMSI mode screen, 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 CRS-170A).
The Pre-Mapped Symbol Interface (PMSI) is a function associated with DoubleTalk
in-Carrier
outbound i nterferer) t o t he s econd modem. T he o ther m odem m ay t hen choose t o t ake t he
PMSI signal and use it for its own CnC reference. In this 1:1 redundancy, 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.
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(CnC) is utilized, the CnC control setting must be set to Redundancy mode
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
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