C–1
Appendix C. ADDRESSING
SCHEME INFORMATION
C.1 Addressing Overview
A CRS-300 1:10 Redundancy Switch provides 1:10 redundancy; that is, you may use the CRS-300 to
control one Redundant Modem and up to 10 Traffic Modems.
You 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-230 Switch Controller card (installed in the CRS-300). 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/A, CDM-570/A, CDM-570L/AL,
SLM-5650/5650A, CDM-710, CDM-700, and CDM-600/L 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 Switch-to-modem communications with the 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, and then daisy-chained to each of the modems.
For 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-300 1:N Redundancy System.
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