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LPOD C-, X-, or Ku-Band Outdoor Amplifier / Block Up Converter (BUC)
MN-LPOD
Appendix A
Revision 14
detailed information about this optional accessory, see the CLC-10 Comtech
LPOD Controller User's Guide (CEFD P/N MN-CLC10).
Serial command ESW determines system operation. Currently, 1:1 redundancy is
supported with either transmit switching (Tx only) or transmit+receive switching
(Tx+Rx). If ESW=1 (Tx Only) or ESW=2 (Tx+Rx) is executed in both units, the
system will be in Automatic Redundancy mode. In this mode, if a fault is
detected with the active (online) unit – either by loss of communications
between the backup (offline) and active units, or via the summary fault – the
backup unit will trigger the waveguide switch and, assuming the backup unit is
not faulted, will become the active unit. The backup unit will also poll the active
unit at regular intervals in an attempt to maintain configuration compatibility
with the active unit; this ensures that, should a fault occur, the backup unit is
configured exactly the same as the active unit.
Redundancy Mode allows the backup (offline) unit to take control of the 1:1
Redundancy System and force a redundant switchover when there is a problem
with the active (online) unit. The backup unit controls the waveguide switches
and polls the active unit through the inter-unit redundancy link, so that it will be
ready to take over for the active unit if necessary.
LPOD Redundancy Mode does not specify which unit must be the backup
(offline) unit. Instead, the status of the backup (offline) and active (online) units
are determined by the waveguide switch position. The advantage to using this
redundancy method is that, after a failure is detected and the backup unit causes
a redundant switchover to occur, the failed unit can be replaced without forcing
a second switchover to occur. This is because the backup unit becomes the
active unit, and when another unit is installed in the system it automatically
becomes the new backup unit.
Because the inter-unit redundancy link uses the EIA-232 interface to
communicate, the user remote commands to the 1:1 Redundancy System must
instead be sent through one of the other remote communications interfaces
(i.e., EIA-485, Telnet, HTTP, or SNMP). The inter-unit redundancy link is not used
when the units are in Manual redundancy mode or when they are in Standalone
(redundancy disabled).
The following parameters are updated via the inter-unit redundancy link (the
equivalent remote command is shown in parentheses):
A–5
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