Comtech EF Data CRS-200 - Manual (Page 43)

CRS-200 Redundancy Switch Front Panel Operation
Rev. 1 7–5
OPTIONS: ACTIVE MODEMS
HOLDOFFS ALARM MASK
The user is prompted to select various options concerning which modems connected to
the switch are active (available for bridging or backing up) and how the switch will react
to various faults.
7.1.3.4 (CONFIG, OPTS) ACTIVE MODEMS
ACTIVE MODEMS: (ENTER)
1 2 3 - 5 6 - 8 9 10
The user is prompted to select which traffic modems should be available for bridging and
backing up. A ‘-‘ will appear in place of the modem number if it is de-selected. If a traffic
modem interface is not plugged into any slot, that position will not be allowed to be
activated. If the switch is unable to read the configuration of the modem in a particular
position, that modem is also not allowed to be activated. A modem must be active in
order for it to be manually or automatically bridged or backed up.
7.1.3.5 (CONFIG, OPTS) HOLDOFFS
BACKUP HOLDOFF SEC: 05
RESTORE HOLDOFF SEC: 10
The user is prompted to set the holdoffs, or 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 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. Both holdoffs can be set from 2 to 99
seconds.