Switch Address; Modem And Transceiver Addresses - Comtech EF Data CRS-311 Installation And Operation Manual

CRS-311 1:1 Redundancy Switch
Appendix C
C.2

Switch Address

The permitted Switch remote control addresses are limited:
•
For EIA‐485 connections, the only permitted addresses are 1000, 3000, 5000, and 7000.
•
For EIA‐232, the only permitted address is 0000.
The Switch settings for external communications are totally independent from the
internal communication between Switch and traffic modems.
C.3

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. An M&C application
can then 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
MCA
RCA
ESA
The SLM‐5650/5650A modems utilize a point‐to‐point internal serial communications bus to the
Switch within the HD‐15 cable. Figure C‐1 illustrates an external EIA‐232 addressing scheme for
these modems; Figure C‐2 depicts an external EIA‐485 connection.
The CDM‐Qx/QxL modems require an external multi‐drop EIA‐485 connection. Figure C‐3
illustrates the external EIA‐232 addressing scheme for a system comprising these modems with a
Switch; Figure C‐4 depicts the external EIA‐485 connection for this configuration. For a distant‐end
CRS‐300/Qx/QxL Switch using Traffic modems in EDMAC Slave mode, refer to Figure C‐5.
Explanation
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, you may change the Switch bus address to 1000, 3000,
5000, 7000, or 9000 (7000 is shown in the figures in this appendix as an example only).
Remote Control Address, to be configured, via the unit front panel (CONFIG:REMOTE)
•
EDMAC Slave Address (Range)
•
Local modem is configured as EDMAC master
•
Distant-end modem is an EDMAC slave
C–2
Revision 7
MN/CRS311.IOM