For Cdm-625A Or Cdm-625S Equipped With The Optional Ip Packet Processor; Configure Cdm-625A Or Cdm-625 Carrier-In-Carrier® For Redundancy Operation - Comtech EF Data CRS-170A Installation And Operation Manual

CRS-170A L-Band 1:1 Redundancy Switch
Modem and Switch Configuration
4.2.1.2 For CDM-625A or CDM-625s Equipped With the Optional IP Packet
Processor
TO AVOID ETHERNET NETWORKING LOOPS – While in 1:1 Redundancy mode, with the optional
IP Packet Processors enabled and both units operating in Managed Switch Mode, the Port 1
M&C Ethernet must be isolated from the Ethernet Traffic. Also, if you use more than one of the
Traffic Ports (Ports 2, 3, or 4), you must use separate Layer 2 switches unless the Layer 2
switch in use isolates these ports from one another.
You may not configure your modem for Dedicated Management Port Mode when the optional IP Packet
Processor is installed and enabled. Under such functionality, in 1:1 redundancy Port 1 is available only
for M&C on both modems, while Ports 2, 3, and 4 are disabled when a modem is in the Offline state.
4.2.2 Configure CDM-625A or CDM-625 Carrier-in-Carrier® for
Redundancy Operation
The Pre-Mapped Symbol Interface (PMSI) is associated with DoubleTalk
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 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.
If you use Carrier-in-Carrier
using the CDM-625A or CDM-625 front panel menus.
Do these steps to configure the CnC control setting for CDM-625A or CDM-625 1:1 Redundancy:
Step Task
From the modem front panel menu – Use the ◄► arrow and ENTER keys to select the PMSI control
1
mode menu:
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 You will now need to connect the two modems together via use of a 1:1 PMSI cable (note that this
cable bypasses the CRS-170A).
• Chapter 5. CABLES
• Appendix A. CABLE DRAWINGS
®
(CnC), you must configure the CnC control setting to Redundancy mode
CONNECTIONS
AND
®
Carrier-in-Carrier
()
4–4
MN/CRS170A.IOM
Revision 14
®
. It permits