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RCS20 M:N Redundancy Switch
User Interfaces
L - indicates that a demodulator is programmed for automatic backup and is currently in "Looped
•
Back" standby. This means that the demodulator is looped to itself and is not locked to the actual
Rx signal. This is necessary in CnC switching mode.
m - indicates that a modulator is programmed for automatic backup.
•
d - indicates that a demodulator is programmed for automatic backup.
•
B - indicates a modulator or demodulator is currently backed up.
•
The screen (shown above) displays the following information:
The MODEM Line shows all of the prime channels available for protection. This line displays either the
numbers 1 through 8, or 1 through 9 if Prime Channel 9 is configured as a backup.
The BU1 Line shows the prime channels that are programmed for automatic backup by Backup Channel
1. This line will have the label BU1-MANUAL if Backup Channel 1 is configured for manual backup. Note
that the automatic backup assignments can be programmed into the RCS20 while the backup channel is
in manual mode; the auto backup assignments will then become active when the backup channel is
placed into auto-revertive or auto-non-revertive backup mode.
The BU2 Line shows the prime channels that are programmed for automatic backup by Backup Channel
2. This line will have the label BU2-AUTO if Backup Channel 2 is configured for auto-revertive or auto-
non-revertive backup.
The PRIOR Line on the above display shows the priority assignments for each prime channel. Priority
numbers range from 1 to 9, with 1 being the highest priority and 9 being the lowest priority. Prime
channels with the highest priority (1) assigned to a backup channel will be placed in hot standby by that
backup channel. When 2 or more prime channels have the same highest priority, then the lowest channel
number will be placed in hot standby. Priorities are also used during automatic revertive backups, if more
prime channels are faulted then there are backups available, then the highest priority prime channels will
be backed up and other priority failed prime channel will drop traffic.
Key
Label
SET
S1
BU1
SET
S2
BU2
S3
PRIOR
S4
NEXT
Numeric Keypad
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Selects Backup Unit 1 for change and cycles to the AUTO MODE BACKUP 1
ASSIGNMENT PROGRAM Subscreen.
Selects Backup Unit 2 for change and cycles to the AUTO MODE BACKUP 2
ASSIGNMENT PROGRAM Subscreen.
Cycles to the BACKUP ASSIGNMENTS, PRIORITIES: Screen.
Press to cycle to the next screen.
N/A
4–17
Function
Revision 15
MN-RCS20 and CD-RCS20
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