Appendix B. 1:1 And 1:2 Redundancy Operation; Introduction; B.1.1 1:1 Redundancy Mode - Comtech EF Data HPOD Installation And Operation Manual

REDUNDANCY OPERATION
B.1

Introduction

Comtech EF Data's C‐, X‐, and KU‐Band High‐Power Outdoor Power Amplifiers (HPODs) can be
used in redundant configuration by connecting the appropriate redundancy loop cable between
the user M&C location and each HPOD 'J4 | REDUNDANT LOOP' port. This 1:1 or 1:2 cable has
connector pinouts that allow the HPODs to both automatically detect the type of cable in use
and, when properly connected between the user and the redundancy setup, automatically
configure itself for operations in accordance with the labeling for each cable connector (SSPA 1
or SSPA 2 for a 1:1 system, or SSPA 1, SSPA 2, or SSPA BU for a 1:2 system).
B.1.1 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 (BU).
The redundancy system's operating mode is determined by using the "RAM" serial remote
command:
•
If RAM=1 i set in both units, the system will be in "AUTO" 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).
•
If RAM=0 is set in both units, the system is set to "MANUAL" redundancy mode, and no
switchovers will occur upon fault detection.
Switch position is determined by using the "SSW" serial remote command:
•
SSW=1 sets the switch to put SSPA 1 online;
•
SSW=2 sets the switch to put SSPA 2 online.
Appendix B. 1:1 AND 1:2
B–1