PT 5780 DVB-T Modulator
ProTelevision Technologies
Operating Instructions
Instruction Manual
Revision 3.11
4-19
There are a total of 13 possible alarm types. Five of the alarm conditions are independent of the
instrument version while eight of the alarm conditions are only available for specific instrument
configurations.
ID Number Alarm Source/Condition
Description
1
Sync and/or Data Loss
Package sync byte (47H) missing and/or
no input data activity (stuffing only). By
hierarchical mode the affected stream will
be indicated (HP and/or LP)
2
Data rate
Input data rate too high (overflow). By
hierarchical mode the affected stream will
be indicated (HP and/or LP)
3
COFDM
Error detected in the COFDM parameters
of the output signal (code rate, guard
interval, constellation and hierarchy).
Note: This alarm is only available when
the built-in demodulator (Demodulator-1)
is configured for monitoring of the output
signal
4
10MHz reference loss
10MHz reference not available
5
System error
Internal malfunction alarm
6
Timing adjusted
Indicates that the modulator has adapted
the internal system clock or internal
1PPS timing to allow for a mismatch
between the local network timing
reference (10MHz and 1PPS) and the
timing reference (MIP) embedded in the
incoming transport stream.
NOTE: ONLY AVAILABLE WITH SFN
OPTION PT 8732
7
1PPS Reference loss
Indicates that external 1PPS reference is
absent (operation may continue based on
internal 1PPS provided instrument was
correctly synchronised before loss of
external 1PPS).
NOTE: ONLY AVAILABLE WITH SFN
OPTION PT 8732
8
Mega-Frame (MIP) Loss
Indicates that no valid MIP is available in
the applied transport stream.
NOTE: ONLY AVAILABLE WITH SFN
OPTION PT 8732
9
RF converter / “
type
”
Indicates that an alarm of the specified
type has been raised for the RF
converter module (for specific alarm
types see below).
NOTE: ONLY AVAILABLE WITH RF
CONVERTER OPTION PT 8715
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Содержание PT 5780
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