Appendix A. Redundancy (Phase 2 Release); Introduction To Redundancy Operation; 1:1 Redundancy Mode; 1:2 Redundancy Mode - Comtech EF Data LPOD PS-1 Installation And Operation Manual

Appendix A. REDUNDANCY
A.1

Introduction to Redundancy Operation

The LPOD can be used in a redundancy configuration by connecting the appropriate 1:1
redundancy cable to the J6 COM1 Connector (see Chapter 2. SYSTEM CONNECTIONS
OPERATION). Once the cable is attached, with the unit placed in redundancy mode via the
correct remote command the system automatically configures the backup (offline) unit by
copying the configuration from the online unit.
A.2

1:1 Redundancy Mode

In 1:1 redundancy mode, the unit that is currently not the active unit (determined by the switch
position) will be the controlling backup unit. The serial command
operation. If ESW=1
Automatic Redundancy mode. In this mode, if a fault is detected with the active unit, either by
loss of communications between the offline and online unit, or via the summary fault, the backup
(offline) unit will switch the waveguide switch and become the active (online) unit (assuming the
backup unit is not faulted). The backup unit will also poll the active unit at regular intervals in an
attempt to maintain configuration compatibility with the online unit. This ensures that should a
fault occur, the backup unit is configured exactly the same as the active unit.
The serial command can be used to put the system in Manual mode (redundancy mode off).
ESW
With set in both units, the system is set to manual redundancy mode and no switchovers
ESW=0
will occur upon fault detection. The switch position is determined by which unit receives the
RED=1 command. This command forces the unit to go online, and will force the switch to throw.
Note that a unit may not be forced offline, only an online force is accepted. The user may mute
(MUT) the online unit if required to go offline.
A.3

1:2 Redundancy Mode

1:2 Redundancy Mode is supported via an external box and is not discussed in this section.
(PHASE 2 RELEASE)
(TX Only) or ESW=2
A–1
(TX + RX) in both units, the system will be in
AND
ESW determines system