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Appendix A
Channels
<1>
Number of
Status Bytes per
Channels
<1>
*Channel 0
Status
<1>
*Backed up
Modulator
<1>
*Backed up
Demodulator
<1>
Switch Major
Alarms
<1>
Switch Minor
Alarms 1
<1>
Switch Minor
Alarms 2
<1>
Latched Switch
Major Alarms
A-2
Maximum number of prime and backup channels available to
the RCS20 switch. 3 decimal for RCS20.
Bit 0 = modulator failure flag
Bit 1 = demodulator failure flag
(0 = no failure, 1 = failure)
Bit 2 = switch communication in process
(0 = no comm in process)
(1 = comm in process)
Bit 3 = modem responding to switch flag
(0 = not responding, 1 = responding)
Bit 4 = modulator present
(0= not present, 1= present)
Bit 5 = demodulator present
(0= not present, 1= present)
0 = This channel not a backup channel, or this channel is a
backup channel but currently not backing up a mod
1 - 9 = This channel currently backing up a mod, channel
number as indicated.
0 = This channel not a backup channel, or this channel is a
backup channel but currently not backing up a demod.
1 - 9 = This channel currently backing up a Demod, channel
number as indicated.
*Note: These 3 bytes repeat for channels 1 - 9 (27
additional bytes used)
Bit 0 = RAM/ROM fault
Bit 1 = No Backup for Faulted Prime
Bit 2 = Error During Backup
(0 = no alarm, 1 = alarm)
Bit 0 = Power Supply #1 Present
Bit 1 = Power Supply #2 Present
Bit 2 = Power Supply #1 Voltage
Bit 3 = Power Supply #2 Voltage
Bit 4 = Communications Error
Bit 5 = Faulted Prime Modem
Bit 6 = Faulted Backup Modem
Bit 7 = Modem Configuration Change
(0 = no alarm, 1 = alarm)
Bit 0 = CDM Error
Bits 1 - 7: Reserved for future expansion
(0 = no alarm, 1 = alarm)
Bit 0 = RAM/ROM fault
Bit 1 = No Backup for Faulted Prime
RCS20 M:N Redundancy Switch
TM056 – Rev. 2.3
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