Harris Constellation, Installation And Maintenance Manual

Page: 34 / 264

Constellation™ 2002 June 20
1-14
ATPC Functionality
With the ATPC feature enabled, the Transmitter Assembly operates at a
reduced power level output of 10 dB below nominal level during normal
operation.
When the RSL (Received Signal Level) at the far-end Receiver drops below a
predetermined threshold, a request for increased transmitter power is sent
upstream to the Transmitter. For a maximum of 5 minutes, the Transmitter
increases the output power to full power by approximately 10 dB.
When a fade condition no longer exists (or 5 minutes have passed), the
Transmitter will return to the reduced power level output of 10 dB below
nominal level.
ATPC can be enabled or disabled through the Keypad.
Software Updates
The download program stores run-time software in the SPU Controller. This
downloading can be done either directly at the local site or remotely from a
distant site.
Replaceable Modules
Plug and play enables the user to remove a field-replaceable module from
service and then replace (or restore) the module without needing to reprogram
the user-configurable settings. All modules in the Signal Processing section can
be removed and replaced without turning off the power.
Alarm Reporting
The following alarm system is supported:
•
Fault LEDs
•
Online LEDs
•
Local status LEDs
•
External control relay and customer external alarm inputs