WEB Interface 105
ID: um_t2gateway CP560 DVB-T2 Gateway User’s Manual Rev. 2.2 (3686)
Max bitrate
If VBR rate mode is chosen this parameter tells the unit the bitrate to use when reading
from the input buffer.
The Re-sync Conditions field:
Bitrate change
Checking this box will make the unit re-synchronise faster in the case of small bitrate
changes. PCR based bitrate measurements deviating 100ppm or more from the initially
determined bitrate causes immediate buffer re-synchronisation.
Latency limits (rel. to pref.)
Checking this box will make the unit re-synchronise if the measured latency exceeds the
configured limits set in the configured preferred latency.
The Regulator Status field allows inspecting the status of the buffer regulator.
Regulator state
This parameter shows the current state of the buffer regulator. The possible states are
Stopped, Rate Estimation, Coarse and Finetune. When data is received and an initial
bitrate estimate is found the regulator enters the Rate Estimation state, where the signal is
analysed to check if a better estimate of the bitrate can be found. When a better estimate
is found the regulator switches to Coarse mode where the output bitrate is coarsely moved
closer to the new rate. From Coarse mode the regulator enters Finetune mode.
Initial bitrate
Here the exact initial bitrate found is displayed.
Current bitrate
This parameter shows the exact bitrate played out on the ASI port at the moment.
Measured bitrate
This parameter is an input to the regulator in the Rate Estimation and Coarse phases, and
shows the bitrate measured for the data stream since last re-sync. In the first minutes after
a re-sync this measurement depends on IP network jitter and is highly inaccurate. After a
few minutes of operation the value gets more and more accurate and can be compared to
the current bitrate to see how far off the target bitrate the regulator is operating.
Regulator output
Indicates the amount of correction the regulator must apply to the output bitrate, with
respect to the initially measured input bit rate, in order to avoid buffer under-/overflow.
Regulator operation range
Indicates the maximum clock correction (in ppm) that may be applied. This parameter
is affected by the “Expected PCR accuracy” parameter and is typically configured slightly
wider to allow headroom for buffer regulation.
Channel uptime
The elapsed time since last re-synchronisation occurred.
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