hysAnalyser --- 关于 DVB (P)SI sections 周期的说明

For satellite and cable delivery systems, where there will usually be sufficient bandwidth within a single delivery
system to carry the SI, the following minimum repetition rates are specified:
a) all sections of the NIT will be transmitted at least every 10 s, including those for other delivery systems, ifpresent;
b) all sections of the BAT will be transmitted at least every 10 s, if present;
c) all sections of the SDT for the actual multiplex will be transmitted at least every 2 s;
d) all sections of the SDT for other TSs will be transmitted at least every 10 s, if present;
e) all sections of the EIT Present/Following Table for the actual multiplex will be transmitted at least every 2 s;
f) all sections of the EIT Present/Following Table for other TSs will be transmitted at least every 10 s, if present;
g) all sections of the EIT Schedule Table for the first 8 days will be transmitted at least every 10 s, including those for other TSs, if present;
h) all sections of the EIT Schedule Table for further than 8 days ahead will be transmitted at least every 30 s, including those for other TSs, if present;
i) the TDT and the TOT will be transmitted at least every 30 s.

For terrestrial delivery systems bandwidth within a single transmitted TS is a valuable resource and in order to
safeguard the bandwidth allocated to the primary services receivable from the actual multiplex, the following minimum
repetition rates are specified in order to reflect the need to impose a limit on the amount of available bandwidth used for this purpose:
a) all sections of the NIT will be transmitted at least every 10 s;
b) all sections of the BAT will be transmitted at least every 10 s, if present;
c) all sections of the SDT for the actual multiplex will be transmitted at least every 2 s;
d) all sections of the SDT for other TSs will be transmitted at least every 10 s if present;
e) all sections of the EIT Present/Following Table for the actual multiplex will be transmitted at least every 2 s;
f) all sections of the EIT Present/Following Tables for other TSs will be transmitted at least every 20 s if present.

The repetition rates for further EIT tables will depend greatly on the number of services and the quantity of related SI information. The following transmission intervals should be followed if practicable but they may be increased as the use
of EIT tables is increased. The times are the consequence of a compromise between the acceptable provision of data to a viewer and the use of multiplex bandwidth.

a) all sections of the EIT Schedule table for the first full day for the actual TS, will be transmitted at least every 10 s, if present;
b) all sections of the EIT Schedule table for the first full day for other TSs, will be transmitted at least every 60 s, if present;
c) all sections of the EIT Schedule table for the actual TS, will be transmitted at least every 30 s, if present;
d) all sections of the EIT Schedule table for other TSs, will be transmitted at least every 300 s, if present;
e) the TDT and TOT will be transmitted at least every 30 s.

In systems where acquisition time of PSI and SI in DVB transport streams is important, it is recommended to
continuously re-transmit these sections at regular intervals, even when no changes occur. Clause 4.4 of ETSI
TS 101 211 [i.1] makes recommendations for how often PSI and SI sections should be re-transmitted.
For SI specified within the present document the minimum time interval between the arrival of the last byte of a section
to the first byte of the next transmitted section with the same PID, table_id and table_id_extension and with the same or
different section_number shall be 25 ms. This limit applies for TSs with a total data rate of up to 100 Mbit/s