Technicolor COM2000 Instrukcja Operatora Pobierz pdf (Strona 119)

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Figure 71 – Streaming Video from a COM46 Card

10.2 Preventing Pro:Idiom key loss

Each commercial TV that supports Pro:Idiom decryption must contain a copy of the secret

Pro:Idiom decryption keys. These keys can be corrupted which will prevent the TVs from

decrypting Pro:Idiom encrypted video until the TV is re-keyed. The main way that Pro:Idiom

TVs lose their keys is as follows:

A Pro:Idiom encrypted channel is being watched. The Pro:Idiom keys are sent on a different

PID for each video channel. The TV is asked to change channels to a different QAM carrier

which causes the TV’s tuner to receive a different transport stream. This new transport stream

contains non-Pro:Idiom key packet on the same PID that previously contained Pro:Idiom key

packets. These are normally audio packets. The Pro:Idiom chip incorrectly interprets these

audio packets as Pro:Idiom key packets. This confuses the Pro:Idiom chip and causes it to lose

its keys.

The QAM6 modulator solves this problem by automatically moving only the Pro:Idiom key

packets to a high PID range that is only used for Pro:Idiom key packets. If a non-Technicolor

piece of equipment is sending packets in the high PID range that overlaps the Pro:Idiom key

PIDs then contact Technicolor for how to modify the QAM6’s Pro:Idiom key PIDs.

To minimize the possibility of Pro:Idiom key loss when using other QAM modulators, the

COM46 will only output a single audio stream. To enable a second audio stream set the

Stream_ID to 54000.

10.3 Changing the Input

If a particular channel in the system is not playing, the first thing you should do is to ensure that

your RF signal strength is outputting appropriate values. Next, try resetting the card. If the

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Technicolor COM2000 Instrukcja Operatora Strona 119