SCTE 07 2000

This standard describes the framing structure, channel coding, and channel modulation for a digital multi-service televisiondistribution system that is specific to a cable channel. The system can be used transparently with the distribution from a satellitechannel, as many cable systems are fed directly from satellite links. The specification covers both 64 and 256 QAM. Most features ofboth modulation schemes are the same. Where there are differences, the specific details for each modulation scheme will be covered.

The design of the modulation, interleaving and coding is based upon testing and characterization of cable systems in North America.The modulation is Quadrature Amplitude Modulation with a 64 point signal constellation (64-QAM) and with a 256 point signalconstellation (256-QAM), transmitter selectable. The forward error correction (FEC) is based on a concatenated coding approachthat produces high coding gain at moderate complexity and overhead. Concatenated coding offers improved performance over ablock code, at a similar overall complexity. The system FEC is optimized for quasi error free operation at a threshold output errorevent rate of one error event per 15 minutes.

The data format input to the modulation and coding is assumed to be MPEG-2 transport. However, the method used for MPEGsynchronization is decoupled from FEC synchronization. For example, this enables the system to carry Asynchronous TransferMode (ATM) packets easily without interfering with ATM synchronization. In fact, ATM synchronization may be performed bydefined ATM synchronization mechanisms.

There are two modes supported: Mode 1 has a symbol rate of 5.057 Msps and Mode 2 has a symbol rate of 5.361 Msps. Typically,Mode 1 will be used for 64-QAM and Mode 2 will be used for 256-QAM. The system will be compatible with futureimplementations of higher data rate schemes employing higher order QAM extensions.

Details

Published:

01/01/2000

ANSI:

ANSI Approved

Number of Pages:

24

File Size:

1 file , 230 KB