Comtech EF Data LPOD Series Installation And Operation Manual page 167

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):
• Auto Fault Recovery (AFR)
• Amplifier state (AMP)
• Attenuation (ATT)
• Auxiliary Mute (AUX)
• LNB Current Window Enable (CWE)
• *Date (DAY)
• Enable Statistics Averaging (ESA)
• Enable Statistics Logging (ESL)
• LNB Current Source enable (LCS)
• LNB Current Window (LCW)
* Day and Time are updated only when the inter-unit redundancy link is either
established or re-established.
The position of the Tx Waveguide Switch determines the online status of a unit in a 1:1
Redundancy System. When the switch is oriented to allow a unit to send RF power to the
antenna (as determined by the switch's failsafe indicator), the unit is considered to be online.
Otherwise, the unit is considered to be offline.
When redundancy mode is disabled (ESW=0), the unit always reports that it is online. This is
because, in standalone mode, there are no waveguide switches monitored and controlled by the
unit. Standalone mode does not use the Tx waveguide switch position to determine online status.
Appendix A
Low Power Outdoor (LPOD) Amplifier/Block Up Converter (BUC)
• Low Power Threshold (LPT)
• Local / Remote Setting (LRS)
• User fault mask (MSK)
• RF mute (MUT)
• Offline Mute (OFM)
• Remote LNB Control (RLC)
• Set Baud Rate (SBR)
• Set Statistics Interval (SSI)
• *Time (TIM)
• External Reference Mute (XRM)
A–5
Revision 15
MN-LPOD