Ericsson AVP 2000 Series - VCM Alarms

Preventive Maintenance and Fault-finding
EN/LZT 790 0023/1 R16A
8-7
• Loss of FPGA PLL lock.
• Loss of reference clock.
• Loss of Clock PLL lock.
• OCXO fault
• PSU failure.
• Host SCR Sync failure.
• Load of calibration data failure.
• Over temperature (including a warning level as well as a critical level).
All masking of alarms is handled by the Host Card.
Self-monitoring
The Satellite Modulator self-monitors for correct operation and corrects any
inconsistencies it finds. This includes the resetting of malfunctioning sub-systems or
the whole card if necessary. The module attempts to maintain correct operation to
minimize the effects of faults. All such actions are reported through the
alarms/status/logging back to the Host Card.
Module Responses
The Host Card monitors all responses back from the module and resets the module
if appropriate. All actions are logged by the Host Card.
8.4.5 VCM Alarms
Alarm Handling
The VCM provides the following alarms back to the Host Card:
• Loss of video (from any source).
• Loss of audio (from any source).
• Loss of VBI data.
• Invalid parameter (indicating which area video/audio/VBI/ANC data).
• Critical alarm (card has malfunctioned; internal log holds nature of failure).
• Over temperature (including a warning level as well as a critical level).
All masking of alarms is handled by the Host Card.