Operating Instructions
ProTelevision Technologies
PT 5780 DVB-T Modulator
Instruction Manual
Revision 3.11
4-22
§
Post-Viterby BER
(sub-menu ID 3442): User definition of the bit error rate
threshold above which the demodulator-2 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 3442): User definition of the UCE counter value at which the demodulator-2
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 2>
à
<RESET UCE>.
Auto Open Alarm Window (ID 3300)
This menu allows the user to select whether the unit shall switch automatically to the alarm
status display whenever an alarm is raised. If the auto open function is set to off the user must
manually navigate to the alarm status display to check whether an alarm is raised. The default
mode is auto open “on”. In this case the user will instantly be notified about the alarm b the
instrument automatically opening the alarm status display when the alarm is raised. However, to
allow uninterrupted operation of the instrument via the front panel during repeated occurrence of
an intermittent alarm the alarm window will not open until five seconds after the last key-press of
any front panel key have taken place.
4.3.4.6
PRESET Menu System (Menu ID 4000)
The PRESET menu options provide the capability of saving (STORE) the modulator’s current
configuration of all parameters in the
Ø
TRANSMISSION,
Ø
SIGNAL – INPUT,
Ø
SIGNAL – OUTPUT (apart from the CHANNEL SETUP menu),
Ø
SIGNAL – MONITOR and
Ø
SIGNAL – REFERENCE INPUT
menus into a preset “location”, naming this “location” (NAME) and recalling and activating
(RECALL) any one of these saved configurations at a later stage.
There are ten preset “locations”, with default names, “Pres Name 1”, “Pres name 2”, etc, etc.
These default presets contain the default values of all the parameters in the above listed menus
and can be overwritten at any time with user-defined presets. These presets are not reset on
carrying out a factory reset.
4.3.4.7
CONFIGURE Menu System (Menu ID 5000)
The CONFIGURE – LOCK – PANEL menu (menu ID 5100) provides the facility to “lock” the
front panel. When the panel lock is “On”, only the status displays and the CONFIGURE – LOCK
menu are available.
It is also possible to “lock”, i.e. prevent local user access, to the PRE-CORRECTION, TEST
SIGNAL AND REFERENCE INPUT menu options, through the CONFIGURE – LOCK menu
option. Note that these functions will still operate within the modulator, even though local user
access is denied.
Summary of Contents for PT 5780
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