Atsc working Draft Template
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- Table 7.1
7. PSIP STD MODEL
7.1 Buffer Model for Terrestrial Broadcast The maximum cycle time for all PSIP tables shall be as shown in Table 7.1. The maximum transmission rate for the PSIP packet streams identified according to their PID type shall be as shown in Table 7.2. The recommended maximum cycle time for EIT-0 is 500 ms. Table 7.1 Maximum Cycle Time for the STT, MGT, VCT and RRT Table STT MGT VCT RRT Cycle time (ms) 1000 150 400 60000 Table 7.2 Maximum Rate for Each PSIP Packet Stream PID base_PID EIT_PID ETT_PID Rate (bps) 250,000 250,000 250,000 For terrestrial broadcast applications the following constraints apply: • In terrestrial broadcast applications, the PSIP elementary streams identified by Transport Stream packets with PID 0x1FFB ( base_PID ), EIT PIDs, and ETT PIDs shall adhere to an STD model with the following parameters: • sb_leak_rate shall be 625 (indicating a leak rate of 250,000 bps) • sb_size shall be 1024 (indicating a smoothing buffer size of 1024 bytes) 7.2 Buffer Model for Cable Transmission rates for cable will be standardized by the SCTE. 7.3 Buffer Model Considerations to Support DCC for Terrestrial Broadcast The maximum cycle time for the Directed Channel Change Table (DCCT) is recommended not to exceed 150 ms. while a DCC request is in progress. The maximum cycle time for the DCCT is recommended not to exceed 400 ms. within 2 seconds of an impending DCC request. It is recommended that there be no maximum cycle time for the DCCT if there are no impending DCC requests. The maximum cycle time for the Directed Channel Change Selection Code Table (DCCSCT) is recommended not to exceed 1 hour 83 ATSC A/65:2013 Program and System Information Protocol, Annex A 7 August 2013 Download 4.82 Kb. Do'stlaringiz bilan baham: |
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