PT 5780 DVB-T Modulator
ProTelevision Technologies
Operating Instructions
Instruction Manual
Revision 3.11
4-21
Alarm Information menu (ID 3200)
This menu allows the user to access further information concerning the status of the various
alarms. For each alarm type a separate sub menu is available which provides information about
whether the alarm is currently active, indicates the total number of times the alarm has been
raised since the alarm counter was reset and, where applicable, more detailed information
about the nature of the alarm (for example, in case of “Sync Loss” alarm it will be indicated if
the sync loss pertains to the HP or the LP input.
Do notice that the Alarm Counters are reset via the separate sub menu Reset Alarm Counter
(ID 3500).
Reset Alarm Counter menu (ID 3300)
This menu allows the user to reset the alarm counters. The menu features both a common
alarm reset option (Reset all) and facilities for resetting the counters on an individual basis. Note
that the alarm counters will automatically reset on reaching a count of 65536.
Alarm Limits menu (ID 3400)
This menu allows the user to set the threshold for the alarms that are triggered when exceeding
a specific parameter value. Subject to the options installed sub menus are available setting the
threshold of the temperature alarm, the RF level alarm (only with PT 5788), and of the bit error
alarms (only with PT 5788).
•
Controller Board Temperature
(sub-menu ID 3410): Allows user specification of the
internal instrument temperature at which the temperature alarm is to be raised.
ProTelevision Technologies recommends that the default threshold 82
°
C be not exceeded.
•
RF Tuner input level
(sub-menu ID 3420): Allows user specification of the minimum RF
input level accepted. If the received level drops below this threshold the RF Tuner Input
Level alarm will be raised (10 – 100dBuV , default value is 10dBuV). Note: This function is
only available with DVB-T Re-Modulator PT 5788.
•
Demodulator 1 Alarm Limits
(sub-menu ID 3430): User definition of the BER and UCE
counts above which the Demodulator 1 alarm will be raised. Only available with PT 5788.
§
Pre-Viterby BER
(sub-menu ID 3431): User definition of the bit error rate threshold
above which the demodulator-1 alarm for Pre-Viterby bit error rate is raised. Default
bit error rate threshold is 1E-2. The adjustable range is 1E-9 to 1E-1.
§
Post-Viterby BER
(sub-menu ID 3432): User definition of the bit error rate
threshold above which the demodulator-1 alarm for Post-Viterby bit error rate is
raised. Default bit error rate threshold is 1E-4. The adjustable range is 1E-10 to 1E-
1.
§
UCE
(sub-menu ID 3433): User definition of the UCE counter value at which the
demodulator-1 alarm for UCE is raised. Default UCE count is 10000. The adjustable
range is 1 to 1000. Count of an UCE (uncorrectable error) is equivalent to detection
of an Uncorrectable MPEG-2 TS packet (UP) as described in section 6.2 of the ETR
290 measurement guidelines (the demodulators Reed-Solomon error correction
overloaded by excessive bit error rate). The UCE counter is reset to zero count via
the sub-menu <RECEPTION>
à
<DEMODULATOR 1>
à
<RESET UCE>
•
Demodulator 2 Alarm Limits
(sub-menu ID 3440): User definition of the BER and UCE
counts above which the Demodulator 2 alarm will be raised (only available when option PT
8722 is installed).
§
Pre-Viterby BER
(sub-menu ID 3441): User definition of the bit error rate threshold
above which the demodulator-2 alarm for Pre-Viterby bit error rate is raised. Default
bit error rate threshold is 1E-2. The adjustable range is 1E-9 to 1E-1.
Summary of Contents for PT 5780
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