Comtech EF Data CRS-150 - Manual (Page 63)

CRS-150 1:1 Redundancy Switch Revision 1
Modem and Switch Configuration MN/CRS150.IOM
5–3
3. Once it has been determined that the 1:1 system is operational, the user should set
up the conditions, via the “Switch Mode” DIP switches on the front panel of the
CRS-150, by which the CRS-150 will initiate an automatic switchover. See Sect.
5.3 for details.
The system, now configured, is ready to be put into service.
5.2.2 Manual Redundant Operation (Forced Switchover)
There are two ways to force manual switchover in a 1:1 system:
1. Switchover via the Front Panel (from the (Select:) UTILITY menu).
2. Switchover via the Remote Bus (ASCII String).
5.2.2.1 Forced Switchover via the CDM-600 Front Panel
Using the CDM-600 front panel keypad, (Select:) UTILITY Æ 1:1-MANUAL-SWITCH,
using the [Å][Æ] arrow keys,
then press [ENT]:
PRESS ENTER TO FORCE THIS
UNIT TO STANDBY (1:1 ONLY)
If the unit is part of a 1:1 redundant pair of modems, and this unit is currently Online,
pressing [ENT] will cause the unit to switch to Standby.
Note: This only works from the front panel of the Online unit. If this is carried out from
the front panel of the Standby unit, it will not cause a switchover.
5.2.2.2 Forced Switchover via Remote Bus
Forced Switchover via Remote Bus can be accomplished with the user’s own software, or
with Comtech EF Data’s Monitor and Control Software package (SatMac).
Send ASCII string (where XXXX is the address of the online unit)
to the online unit to force a switchover.
5.2.3 Replacement of Standby Unit
If it becomes necessary to remove a Standby unit from the redundancy system,
turn the power
off before attempting to disconnect any of the cables.
Similarly, when replacing a Standby unit, fully reconnect all cables before
applying power.
REMEMBER: In a typical 1:1 modem stack, the top unit is ‘Modem A’; the bottom
unit is ‘Modem B’.