Comtech EF Data CDM-740 - Manual (Page 147)

CDM-740 Advanced Satellite Modem Revision 0
1:1 Redundancy MN-CDM740
C–7
From the Utilities: menu branch, select 1:1 using the ◄ ► arrow keys, then press ENTER .
Press ENTER key to force unit into
Standby (1:1 only)
The CDM-740 automatically detects the presence of a CRS-175L L-Band 1:1 Redundant Switch.
If Utility: 1:1 is selected and this unit is currently online and part of a 1:1 redundant modem pair
operating in tandem with a CRS-175L switch, the user is prompted to press ENTER (as indicated
above); this command then automatically forces the switchover of operation to the backup
(standby) modem.
If, however, 1:1 is selected from the Utility menu branch and no CRS-175L switch is detected,
the following error message displays:
... Error ...
No Valid Redundancy
An important note about 1:N redundancy selection: The CDM-740 presently does not
accommodate 1:N redundant operations; therefore, while selectable, this submenu is non-
functional. If, however, 1:N is selected from the Utility menu branch – regardless of the presence
of a CRS-175L switch – the following error message displays:
... Error ...
No Valid Redundancy
C.3.2.2 Redundancy Operation via Telnet Remote Control
The user can effect 1:1 redundancy switchover using a terminal-based Telnet interface. Using the
FSW remote control command via Telnet remote control is equivalent to the front panel SELECT:
Utility Æ 1:1 (ENTER) command. Observe the following:
Parameter
Type
Command
(Instruction
& Qualifier)
Description of Arguments
Force 1:1 Switch FSW= Command only.
This command takes no arguments. Forces the unit to toggle the Unit Fail relay to the
“fail” state for approximately 500ms.
If the unit is a 1:1 pair and it is currently the ‘Online’ unit, this forces a switchover so the unit
will then be in ‘Standby’ mode.
The command is always executed by the unit regardless of whether it is stand-alone, or in a
1:1 pair.
For complete details on using remote monitor and control commands and quieries, refer to
Appendix A. REMOTE CONTROL in this manual.