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USER'S MANUAL. PROLINK-4
If at any time, the received signal stops to satisfy the requirements of the
MPEG-2 standard, this counter will deactivate, that is to say it will keep the number of
non-correctable packets received and the measuring time, later, if an MPEG-2 signal is
received again, it will activate with no reset.
When during any measuring time interval the counter has been deactivated, in
other words the signal has not satisfied the MPEG-2 synchronism, the presentation of
this counter will alternate with another counter titled FAIL. This second counter shows
the time that the detected signal has not fulfilled the MPEG-2 standard requirements (12
seconds in the example of the following figure) and the number of signal cuts (2 in the
example of the following figure). To reset the counter it is necessary to change any of the
detection parameters, for example tune again the signal or push twice the
Figure 16.- Signalling two MPEG-2 signal cuts with a total length of 12 seconds.
Finally it is shown a status line with information about the detected signal. The
possible messages that can appear and its meaning are showing the following list. The
messages are exposed from less to more fulfilment of the MPEG-2 standard:
No signal received
No signal has been detected.
Timing recovered
Only it is possible to recuperate the symbol time.
AFC in lock
The system automatic frequency control can identify and lock a digital
transmission (TDT) but its parameters can not be obtained. It can be due to a
transitory situation previous to the TPS identification (Transmission Parameter
Signalling) or well to a TDT transmission with an insufficient C/N ratio.
02/2003
[22] key.
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