Operating instructions

Maintenance RCS20 M:N Redundancy Switch
6-2 TM056 - Rev. 2.3
Each of the slide-in power supply modules houses AC fuses that are
accessible from the rear of the unit. The fuses can be replaced in the field
while maintaining redundancy protection for modems connected to the
RCS20 by changing the fuses for one power supply at a time. Be sure to
replace the fuse with one of the same type and rating. Failure to do so may
result In damage to the equipment and may result In a fire hazard.
6.2 RCS20 Alarms
The RCS20 performs extensive self-monitoring and fault isolation as part of its normal operation.
Any condition that occurs that in not part of the normal operation of the switch result in an alarm
condition, during which the user is notified of the alarm status via the front panel LEDs and the rear
panel Alarm connector (J1 on the Switch Interface Module). The alarms are separated into two
categories: Major Alarms and Minor Alarms. Refer to Table 6-2 and 6-4 for the Major and Minor
Fault Matrices.
6.2.1 Major Alarms
Major Alarms indicate that failure conditions that result in loss of service on one or more primary
satellite channels. A major alarm may be caused by an internal switch hardware failure, by failure
of one or more modems under redundancy protection, or by an incorrect configuration. A Major
Alarm condition is indicated by illumination of the MAJOR ALARM LED on the front panel and by
relay closure on the real panel Alarm connector. All conditions resulting in an RCS20 Major Alarm
are described in Table 6-1 and a Major Alarm matrix is shown in Table 6-2. The alarm matrix shows
all possible alarm conditions, and any actions taken by the RCS20 in response to the alarm.
Table 6-1. RCS20 Major Alarms
RAM/ROM The RCS20 has detected a failure in either the internal Random
Access Memory, or the Read Only Memory. If this alarm persists,
the unit must be returned to Radyne, Inc. for repair.
BACKUP UNAVAILABLE The RCS20 attempted to backup a failed prime channel modem, but
no backup channel modem was available because all backup modem
channels are currently in use.
ERROR DURING
BACKUP
The RCS20 attempted to backup a failed prime channel modem, but
there was an error during the backup process that prevented the
backup from going on-line.