CRS-300 1:10 Redundancy Switch

Revision 16

Modem, RMI/TMI, and Switch Configuration

MN/CRS300.IOM

5.5.3.4.2Set Restore Holdoff Period

The "Restore Holdoff" setting, which is also programmable from 1 to 99 seconds, determines the Switch's ability to automatically put a backed-up Traffic Modem online again if its fault clears.

Normally, a failed modem that was taken offline will remain offline indefinitely. If the fault clears, traffic will be returned to the unit (in Auto mode) only if another Traffic Modem then fails.

If the fault on the originally failed modem has been clear for the full programmed Restore Holdoff time, the Switch places that modem back online, and bridges the newly faulted modem. If the new fault is sustained, the Redundant Modem can then be used to backup the newly faulted modem.

If the Priority selection (see Chapter 7.4.3 CONFIG Æ OPTIONSÆ PRIORITY) is not enabled, the Switch deals with Traffic Modem failures on a "first come, first serve" basis. If the User sets the Switch to bridge the highest priority circuit, switching time will be minimized in the event of a failure. If two faults occur simultaneously and are both sustained for the holdoff time, the lower-numbered circuit will be backed up.

To set the Restore Holdoff Period:

Step Procedure

1Go to the CONFIG Æ OPTIONS Æ HOLDOFFS menu.

2Change the RESTORE HOLDOFF to any number in the range of 1 to 99 seconds.

5.5.3.5Set Alarm Masking

Another way to adjust the Switch's reaction in Auto mode is to mask modem faults. The User may disable modem Rx, Tx or both fault types so that the Switch does not react to them. This masking prevents the Switch from taking automatic action and prevents the logging of the faults in the stored events list.

These masks are global to all the modems attached to the Switch.

To set Alarm Masks:

Step

Procedure

1 Go to CONFIG Æ OPTIONS Æ MASKS Æ MODEM-ALARMS.

2 Set the mask parameters as desired.

In the event that a second fault occurs, another Mode. For detailed information on Priority

OPTIONSÆ PRIORITY.

way to influence Switch behavior is via Priority Mode, refer to Chapter 7.4.3 CONFIG Æ

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Mocomtech CRS-300 operation manual Set Restore Holdoff Period, Set Alarm Masking