Appendix C. Addressing Scheme Information; Introduction To Addressing - Comtech EF Data CRS-311 Installation And Operation Manual

Appendix C. ADDRESSING
C.1

Introduction to Addressing

A CRS‐311 1:1 Redundancy Switch provides 1:1 modem redundancy; that is, it is capable of
controlling one Traffic Modem and one Redundant Modem.
You can remotely communicate to the Switch or either of the modems, using the appropriate
addresses, via EIA‐232 or EIA‐485 using the DB‐9M "Remote Control" connector on the CRS‐230
System Controller module that is installed in the CRS‐311.
•
For Switch‐to‐modem communication using SLM‐5650/5650A modems: The Switch uses
serial communication via the HD‐15 Control Cable that is connected between each TMI/RMI
and the modems.
•
For Switch‐to‐modem communication using CDM‐Qx/QxL modems: The Switch uses
EIA‐485 communications via a DB‐9 multi‐drop cable that is connected from the "485
Pass‐Through" connector on the CRS‐230, then daisy‐chained to each of the modems.
If the modems are configured for EDMAC framing, Monitor & Control (M&C) information may
be communicated to the modems and transceivers at the distant‐end of the link. In order for an
M&C application to be able to communicate with the various modems connected to the Switch,
the correct addresses must be used.
This appendix defines the address requirements to allow M&C of the Switch and the modems that
may be included in a CRS‐311 1:1 Redundancy Switch system.
SCHEME INFORMATION
C–1