Comtech EF Data CRS-500 - Manual (Page 209)

C–1
Appendix C. ADDRESSING
SCHEME INFORMATION
C.1 Introduction to Addressing
A CRS-500 1:N Redundancy System provides 1:N redundant operations – that is, it is capable of
controlling up to 10 Traffic modems and one Redundant Modem in up to a 1:10 configuration.
The user can remotely communicate to the Switch or any of the modems via the DB-9, EIA-232,
or EIA-485 Remote connector on the CRS-530 Switch Controller card (installed in rear panel of
the CRS-500 Control Switch Unit – CSU). A direct User-to-modem connection is not permissible
in this configuration – master operation is restricted to the Switch in a redundancy system.
For Switch to modem communications with the CDM-625 modems, the Switch uses serial
communications via a DB-25 data cable or an HD-15 Control Cable that is connected between
each modem and the Switch-installed TMIs.
For the modems that 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 devices connected to the
Switch, the correct addresses must be used.
This appendix provides details of the address requirements to allow M&C of the Switch, various
modems, and transceivers that may be included in a CRS-500 1:N Redundancy System.
C.2 Switch Addresses
The permitted Switch remote control addresses are limited:
• For EIA-232, the only permitted address is 0000.
• For EIA-485 connections, the only permitted addresses are 1000, 3000, 5000, and 7000.
The Switch settings for external communications are totally independent from the
internal communication between Switch and traffic modems.