Program and System Information Protocol (PSIP)
Enough bandwidth is available within the MPEG-2 transport stream to support several low-bandwidth non-television services such as program guide, closed captioning, weather reports, stock indices, headline news, software downloads, pay-per-view information, etc. The number of additional non-television services (virtual channels) may easily reach ten or more. In addition, the number and type of service will constantly be changing.
To support these non-television services in a flexible yet consistent manner, the Program and System Information Protocol (PSIP) was developed. PSIP is a small collection of hierarchically associated tables (see Figure 8.1 and Table 8.2) designed to extend the MPEG-2 PSI ...
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