Comtech EF Data KST-2000A, Installation And Operation Manual

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Ku-Band Satellite Transceiver Revision 9
Operation MN/KST2000AB.IOM
3–21
For example: to place Unit B uplink online, the remote backup manual operation
command to Unit B’s uplink will be issued. Refer to Appendix B.6.
In the manual mode, as well as any other backup enabled operating mode, the
switch position indicators on the RJU-2000 will indicate which uplink and downlink
is online by illuminating an appropriate LED indicator. Generally, after the redun-
dant KST-2000A/B system has been set up for its final operating condition, auto-
matic system operation/protection mode is enabled.
In automatic mode, remote backup manual operation commands will be ignored by
the system, and manual interference of the TX or RX waveguide switch position will
be overridden by the system.
Two types of automatic protection are supported by the KST-2000A/B:
•
Automatic, independent switching – In this automatic protection mode, each
KST-2000A/B will monitor uplink and downlink fault inputs from the other
KST-2000A/B. Independent switching of the uplinks and downlinks can occur.
For example: A fault in an online uplink will cause the the offline KST-2000A/B to
place its uplink online by transferring the TX waveguide switch to its position. In
this scenario, the downlink path remains unchanged until a fault occurs in the
online downlink. If a standby link is faulted, no switching will occur until either the
A or B link fault clears.
•
Automatic, chain switch (dependent switching) mode – Operation in this mode is
similar to automatic independent operation, except that when a fault occurs both
the up and down link of the faulted KST-2000A/B are transferred offline.
Possible Redundancy Errors:
In the automatic modes, if the 1:1 interface cable is removed from one of the
KST-2000A/Bs, the remaining attached KST-2000A/B will assume control of both
the uplink and downlink. Both KST-2000A/Bs will report a 1:1 cable fault.
The KST-2000A/B in backup enabled mode will report a TX, RX, or IF switch fault
if the corresponding cable is removed from a switch, or if the position indicators are
malfunctioning.
Both of these errors require that either:
•
Backup mode be disabled, and then re-enabled.
Reference: Refer to Appendix B.6 after the fault is cleared, or
•
A reset redundancy faults command is issued to each unit.
Reference: Refer to Appendix B.9.