OPERATORS MANUAL
TT1200 MPEG2-DVB PROFESSIONAL DECODER
PAGE 45
TANDBERG TELEVISION ASA, Philip Pedersensvei 20, PO Box 322, N-1324 Lysaker, Norway
Tel: +47 67 11 62 00, Fax: +47 67 11 62 01
Alarm
Displays informations about alarms and warnings in the TT1200
'HPRG
Displays information about the demodulator status. The following
information is available: Signal to noise ratio (Eb/No), Bit Error Ratio
(BER), Automatic Frequency Control (AFC) and Automatic Gain Control
(AGC).
$6,,Q
Displays information about the ASI input status. The following information is
available: Signal sync ok or no sync, and packet length (188 or 204 bytes).
6LJQDO
Displays information about the signal. The following information is
available: Video information (Bit rate, picture format and more), Audio
information (Bit rate, MPEG layer and more), VBI status and PTS status.
&$PRGXOH
Displays CA status (whether the signal is clear, descrambled, has No access
and more), and smart card information (if available).
3,'LQIR
Displays the components (PIDs) of the selected service.
5.5.1 Alarm status
The
Alarm Status
menu is then used to investigate the status of the decoder and to check if any of the
preset conditions have occurred. The
Alarm Status
menu will show the condition of the decoder with
respect to the conditions selected in the
Alarm Setup
menu. Selecting one of the entries of the
Alarm
Status
menu will show the status messages describing the current condition of the decoder. Each status
message has assigned an alarm level, which may be one of three:
$
ALARM
:
WARNING
DISABLED
The ‘-’ means that the error message is considered unimportant and should be ignored if it occurs. ‘W’
means that a warning messages is generated on the status display if the error message occurs. ‘A’ means
that this error message is considered to be a serious fault, an alarm message is generated and the alarm
relay on the TT1200 will be switched to ALARM.
Note that if the
Alarm Hold
parameter has been set in the
Setup
⇒
Advanced
menu, the alarm
condition that caused an alarm, will be displayed some time after the alarm itself has disappeared. This
delay is specified by the user in the
Alarm Hold
menu. The advantage of this is that it is possible to go
back and review the alarm even after it has gone.
5.5.2 Demodulator Status Menu
This menu displays the status of the demodulator, and includes the following information:
(E1RG1
Approximate signal to noise ratio
$)&N+]
Approximate error in signal’s centre frequency. This value should be
added/subtracted to the LNC frequency.
%(5
Approximate Bit Error Rate (BER) measurement
7XQHU$*&
Approximate measurement of the signal strenght (Automatic Gain
Control)
When demodulator signal is received OK, check the status of the demodulator in the
demod status
menu. An approximate signal to noise display is showed. The AFC display (Automatic frequency
control) gives an approximate error in signal’s centre frequency. Your LNC may drift under different
operating temperatures, and this display should be checked some time after power on to find the
stabilised offset frequency. This frequency should be added/subtracted from the LNC frequency, which
was the first parameter you entered. If you enter the
Demod Setup
menu, the offset will be displayed
in the first line. Type in the offset seen and verify that the top line changes to the value 0.0000GHz. The
