Comtech EF Data CRS-400 - Manual (Page 49)

CRS-400 1:8 Redundancy Switch Revision 0
Installation and Setup MN/CRS400.IOM
33
2.14.3 125
2.14.4 R
ESTORE
H
OLDOFF
O
PERATION
The “Restore Holdoff” setting, which is also programmable from 2 to 99 seconds,
determines the switch’s ability to automatically put a backed up traffic Mod/Demod
online again if its fault goes away. Normally, a failed Mod/Demod that was taken offline
will remain offline indefinitely (unless the Auto-Restore feature is enabled). If the fault
goes away, traffic will be returned to the unit (in Auto mode) if another traffic
Mod/Demod fails. The switch places the originally failed Mod/Demod back online if its
fault has been clear for the full programmed Restore Holdoff time. The redundant
Mod/Demod can then be used to backup a newly failed Mod/Demod.
The switch has no prioritization scheme, so that multiple traffic Mod/Demod failures are
treated on a “first come, first serve” basis only. If the redundant unit is set 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
number circuit will be backed up.
2.14.4.1 S ET THE R ESTORE H OLDOFF P ERIOD
1 Go to the CONFIG, OPTIONS, HOLDOFFS menu.
2 Change the RESTORE HOLDOFF to any number in the range of 2 to 99 seconds.
2.14.5 A LARM M ASKING
Another way to adjust the switch’s reaction in Auto mode is to mask Mod/Demod faults.
The user may disable modulator, demodulator, 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.
Note: These masks are global to all the Mods/Demods attached to the switch.
2.14.5.1 S ET THE A LARM M ASKS
1 Go to CONFIG, OPTIONS, MASKS, MODEM-ALARMS.
2 Set the mask parameters as desired.
Note: Please read the manual for the SDM-2020 also. Details of the modulator and
demodulator equipment operation are not covered in the CRS-400 manual.
Once the switch has been installed and setup has been completed, regular operation may
begin. Please refer to Chapter 3, Operation, for more information.