Comtech EF Data CLO-10 - Manual (Page 108)

CLO-10 Link Optimizer Revision 1
Redundant System Operation MN/CLO-10.IOM
A.6.4 Set Operation Mode
The CLO-10 is shipped in the AUTO-OFF (manual operating) mode. This setting causes the
orange Stored Event LED to flash. The system is operational; however, it is still operating in
AUTO-OFF ( manual operating ) mode. While in this mode, the user can manually select which
Traffic Unit will be bridged or backed-up.
While in AUTO-OFF ( manual operating ) mode, the Redundant Unit does not automatically react
to any Traffic Unit failures it detects. Comtech EF Data recommends that an unattended system
be configured to operate in
AUTO-ON (automatic operation) mode.
When AUTO-ON (automatic operation) mode is enabled, the first active Traffic Unit that fails is
first bridged by the Redundant Unit, then backed up.
To enable AUTO-ON (automatic operation) mode:
Step Procedure
1 Go to the CONFIG Æ MISC Æ REDUNDANCY Æ AUTO (OFF/ON) menu and select
the AUTO-ON mode.
2 Verify that the Stored Event LED stops flashing.
A.6.4.1.1 Set Holdoff Period
A holdoff period prevents unwarranted backups due to an intermittent fault. When in AUTO-ON
(automatic operation) mode, additional delays may be introduced to the backup procedure by
setting the number of seconds for "holdoff" before a faulted Traffic Unit cedes operation to the
Redundant Unit (backup), or operation is returned from the Redundant Unit back to the Traffic
Unit (restore).
The process is further explained:
If a fault occurs in a Traffic Unit, and the Redundant Unit operation is fault-free, backup is
initiated once the configured Backup Holdoff Period lapses. However, if the fault clears
within the holdoff’s configured timeframe, no transfer of operation occurs.
Similarly, if a fault occurs in the Redundant Unit, and the Traffic Unit’s operation is fault-
free, restore is initiated once the configured Restore Holdoff Period lapses.
The default holdoff period is 10 seconds (a minimum of 1 second and a maxium of 99 seconds is
allowed).
A.6.4.1.2 Set Backup Holdoff Period
If a Traffic Unit fails, the Switch waits for the backup holdoff time to determine two things:
1) Does the Traffic Unit remain faulted?
and
2) Is the Redundant Unit not exhibiting the same fault?
If the answer is yes to both questions for the entire backup holdoff time, then the Redundant Unit
first bridges the faulted unit. If the fault is sustained, then the switchover to the Redundant Unit is
completed and the Redundant Unit carries the traffic.
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