Comtech EF Data LPOD Hardware Installation And Operation Manual page 96

LPOD C-/Ku-Band Outdoor Amplifier/ Block Up Converter (BUC)
Appendix A
Redundant mode allows the backup (offline) unit to take control of the redundant system and
force a redundant switchover when there is a problem with the active (online) unit. Currently, 1:1
redundancy is supported with either transmit switching or transmit and receive switching. The
backup unit controls the waveguide switches and polls the active unit through the inter-unit
redundant link, so that it will be ready to take over for the active unit if necessary.
The inter-unit redundant link uses the RS-232 interface to communicate, so the user remote
commands to the redundant system must be sent through one of the other remote communications
interfaces (i.e., RS-485, Telnet, HTTP, or SNMP). The inter-unit redundant link is not used when
the units are in manual redundant mode or when they are in standalone (redundancy disabled).
The following parameters are updated via the inter-unit redundant link (see Appendix B.
REMOTE CONTROL for more information on each of the individual parameters):
•
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)
*Note: Date and time are only updated when the inter-unit redundant link is either established or
re-established.
The online status of a unit in a redundant system is determined by the position of the Tx
waveguide switch. When the Tx waveguide switch is oriented to allow a unit to send RF power to
the antenna (as determined by the waveguide switch failsafe indicator), the unit is considered to
be online. Otherwise, the unit is considered to be offline.
When redundant mode is disabled, the unit will always report that it is online. This is because
standalone mode does not use the Tx waveguide switch position to determine online status, since
there are no waveguide switches monitored and controlled by the unit in standalone mode.
Only the offline unit is allowed to initiate a redundant switchover by throwing the waveguide switches.
The offline unit will initiate a redundant switchover if any of the following conditions are met:
1. Online unit faulted, and offline unit is not faulted.
2. Inter-unit redundant link established, and then timed out.
3. Mismatched waveguide switch condition is detected.
4. Unit is forced online through a remote command.
If the unit has offline mute (OFM) enabled, then the unit will mute the RF output when it is offline.
The OFM state also affects the bias tee switch position, because the bias tee switch serves as the
unit's Rx path mute, so it is tied to the mute state (MUT) of the unit while the unit is running in
redundant mode (i.e., if MUT=1 then SBT=0, and if MUT=0 then SBT=1). If the user tries to
change the bias tee switch position while redundant mode is enabled a mode error will result.
•
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–2
Revision 3
MN-LPOD