Comtech EF Data CRS-500 - Manual (Page 130)

CRS-500 1:N Redundancy System Revision 2
CSU Front Panel Operation MN-CRS500
7–14
not a priority link – if the priority link now fails, the link will be restored regardless of its fault
state. The priority link will be bridged and then backed up.
Only activated TMI slots will be available for selection as the ▲▼ arrow keys are
pressed, up to a maximum of 10 TMs for 1:N configurations.
7.2.2.1.5.2 CONFIG: Options  Holdoffs
Backup Holdoff: 05 sec.
Restore Holdoff: 10 sec.
You may set the Holdoffs (delay times) between the switch’s modem alarm detection and its
reaction to the event. These Holdoffs are only applicable when the switch is in Auto Mode.
When an active modem exhibits an unmasked fault, the switch bridges it with the Redundant
Modem and checks that the latter is not also faulted. If there is no fault, the Backup Holdoff
determines how long the switch will wait before performing the actual backup, or switchover of
traffic to the Redundant Modem.
When the switch is currently backing up a Traffic Modem, and that offline modem’s fault clears,
the switch will continue to back it up unless another active modem becomes faulted. In this
case, the Restore Holdoff is the length of time that the originally faulted modem must stay
unfaulted before the switch will automatically put it back online so that the Redundant Modem
is available to bridge the newly faulted modem.
Use the ◄ ► arrow keys to select Backup Holdoff or Restore Holdoff, and then use the ▲▼
arrow keys to adjust the time (in seconds). Press ENTER to configure.
Both Holdoffs can be set from 1 to 99 seconds, the exception being that if the
configuration includes Carrier-in-Carrier  , this Holdoff time should be no less than 8
seconds.
7.2.2.1.5.3 CONFIG: Options
 Alarm-Mask
Alarm Mask: Modem-Alarms
Switch-Alarms Audio
The switch logs and reacts to both its own faults and modem faults. Use this submenu to mask
either type of faults. In addition, an audible buzzer can be enabled as an additional indicator.
Use the ◄ ► arrow keys to select Modem-Alarms, Switch-Alarms, or Audio, and then press
ENTER.