TANDBERG TT-1222, Справочное руководство

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Alarm Categories and Conditions
Reference Guide: TT1222 4:2:0 Professional Receiver Page D-3
ST.RE.TT1222.2
D.1 Alarm Conditions
This chapter lists the alarm conditions detected by the unit. It also lists a
description for the alarm, a possible remedy, and the default state of the
alarm in the alarm configuration menu.
D.2 Input Stage Alarms
D.2.1 QPSK Input Alarms
The QPSK input alarms relate to alarms received form the DVB-S QPSK
demodulator, or the lack of communication with this component.
Table D.1: QPSK Alarm Categories and Conditions
Alarm Category Contents
Alarm Description Remedy Default
Tuner fail This alarm is set if the
communication with the
tuner is lost. A
No signal Alarm only if the RF level
has been zero for more than
2 consecutive times Check signal source A
No lock Demod will not be deemed to
be locked until full lock status
has occurred for 3
consecutive polls Check input settings
(frequency, FEC,
symbol rate etc.) A
BER
exceeded BER TOO HIGH is declared
when BER estimate exceeds
# defined value for FEC rate. The input signal
strength or quality is
not adequate. W
QPSK Input:
Imp. Overflow The input rate is too high. Use a transport
stream with a lower
bit-rate, usually by
reducing the # of
0-packets A
NOTE…
These alarms are only available when the QPSK input module is fitted in the receiver.
D.2.2 ASI Input Alarms
The ASI input alarms relate to errors seen at the ASI input.
Table D.2: ASI Alarm Categories and Conditions
Alarm Category Contents
Alarm Description Remedy Default
ASI Input:
No sync Will alarm if the receiver can
not lock to the incoming
transport stream. Check signal source A
NOTE…
These alarms are only available when the ASI input module is fitted in the receiver.