A–1
Appendix A. 1:1 REDUNDANCY
A.1 LPOD Redundancy Operation Overview
The LPOD Outdoor Amplifier / Block Up Converter 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, INSTALLATION
AND STARTUP). Once the cable is attached, with the
units placed in Redundancy Mode via the correct remote command the system automatically
configures the backup (offline) unit by copying the configuration from the active (online) unit.
A.2 1:2 Redundancy Mode
1:2 Redundancy Mode is supported via an external controller box and is not addressed in this
appendix.
A.3 1:1 Redundancy Mode
The RS-232 Interface is not available for 1:1 Redundancy.
See Chapter 5. SERIAL-BASED REMOTE PRODUCT MANAGEMENT for detailed
information about the remote commands and queries specified in this section.
In 1:1 Redundancy Mode, the unit that is currently not the active (online) unit (as determined by
the switch position) will be the controlling backup (offline) unit.
Serial command
ESW determines system operation. 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.
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