Comtech EF Data CRS-500 - Manual (Page 210)

CRS-500 1:N Redundancy System Revision 2
Appendix C MN-CRS500
C–2
C.2.1.1 Modem and Transceiver Addresses
To monitor and control modems and transceivers at the distant-end of the communication link,
EDMAC must be enabled, via the modem front panel, in local mode. Set the Tx and Rx
parameters to establish the link on the modems on each end of the link. Then, an M&C
application can be used.
Examples of EIA-232 and EIA-485 addressing schemes are shown in the diagrams that follow.
Included in these diagrams is the following terminology:
Abbreviation Explanation
MCA
Monitor & Control Address, to be entered as the address of a unit into an M&C application,
e.g., SatMac.
Modem addresses are automatically assigned by the TMI/RMI slot positions to which they are
associated within a Switch.
When using EIA-485 multi-drop, the Switch bus address be changed on the Switch by the User
to 1000, 3000, 5000, 7000, or 9000 (7000 is shown in the figures in this appendix as an
example only).
RCA Remote Control Address, to be configured, via the unit front panel (CONFIG:REMOTE)
ESA
EDMAC Slave Address (Range)
Local modem is configured as EDMAC master
Distant-end modem is an EDMAC slave
The CDM-625 modems utilize a point-to-point internal serial communication bus to the Switch
within the DB-25 or DB-9 cable. Figure C-1 illustrates an external EIA-232 addressing scheme for
these modems; Figure C-2 depicts an external EIA-485 connection.
Note: These figures depict a typical 1:10 Redundancy configuration, where up to 10 Traffic
modems and one (1) Redundant Modem are employed.