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Overview • 8QRM/RF Redundancy
APEX1000 All-Purpose Edge QAM Software Version 2.4.x • Installation and Operation Manual
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573408-001-a
8QRM/RF Redundancy
Each APEX1000 unit contains up to three RFPM QAM modules, and each RFPM QAM
module consists of two Octal QAM modules (8QRM) sub modules. There are, as a
result, six 8QRM sub modules in a fully loaded APEX chassis. The APEX1000 includes
support for 8QRM/RF port
narrowcast
redundancy, provided by the
REM1000
. In the
APEX module redundancy scheme, one of the 8QRM sub modules within an APEX
chassis is designated as the backup; the other five are designated as primaries. If any
primary sub module fails, the backup module takes over, and the APEX internally handles
the re-routing of the necessary GigE inputs to the backup module.
The following functions are available on an APEX/REM redundancy pair:
•
RF Redundancy
— The APEX provides a redundant backup port which is activated
when one of the five remaining primary ports fails. The backup port becomes a copy
of the primary port sourcing identical OTSs to the primary prior to its failure.
•
RF Failover
— Occurs when the APEX switches data from the primary port to the
backup port (due to a failure event or operator command).
•
RF Switchback
— Occurs when the APEX switches data back from the backup port
and returns to the primary port (due to operator intervention or resolution the failure).
On an 8QRM failure, the REM10000 RF switch handles the APEX RF outputs to make
certain that the RF signals previously sourced by the failed 8QRM module to a specific
downstream service group are now sourced by the backup 8QRM module to the
same
downstream service group.
The graphic below illustrates the association between the REM and the APEX:
•
For information on purchasing the REM1000, please contact the
.
•
For additional details on 8QRM/RF Redundancy, reference the
section of this guide.
