Comtech EF Data CRS-311 - Manual (Page 189)

D–1
Appendix D. SLM-5650/5650A
INDEPENDENT MODE OPERATION
D.1 Introduction
This feature is for use
ONLY with the SLM-5650/5650A.
Per customer request, an optional Independent Mode of operation is available for use in the
CRS‐311 1:1 Redundancy Switch with SLM‐5650/5650A modems. In Independent Mode, each
modem operates independently and simultaneously (dual‐carrier); the CRS‐311 is used only to
enable control and monitoring of both modems via a single EIA‐232/EIA‐485 control line.
D.2 Feature Description
Figure D‐1 shows the CRS‐311 connected in the standard way; Figure D‐2 shows the CRS‐311
connected in Independent Mode.
Key functionality in Independent Mode:
a. The CRS‐311 will not switch if a fault occurs. Switch configuration is “hard‐wired” to the
primary modem:
i. Data switch routes data signals to/from the primary modem.
ii. The CRS‐281x IF switch connects the Redundant Modem’s Tx IF to the User’s Tx IF.
b. No automatic control of the Redundant or primary modem configuration:
i. Does NOT control the configuration of the Redundant Modem (i.e. no “mirroring” or
other control of the Redundant Modem’s configuration to match the primary modem).
ii. Does NOT mute the RF output of primary modem under any circumstances.
c. Supports EIA‐232/485 remote monitor and control connectivity to both modems.