T-VIPS CP560, User Manual

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104 WEB Interface
CP560 DVB-T2 Gateway User’s Manual Rev. 2.2 (3686) ID: um_t2gateway
Max roundtrip
The maximum time taken from sending a Ping message until the response is received.
8.5.2.3.4 Regulator
The
Regulator
sub page is shown if figure 8.55 .
Figure 8.55 Regulator page
In the Regulator Settings field it is possible to adjust the settings of an IP input buffer regulator.
Pref. Init. Rate Mode
From the pull-down list select the preferred algorithm to find the initial bitrate of a received
data stream.
PCR
The default mode is PCR , in which case a number of consecutive TS packets of the
first PCR PID encountered are used to calculate the bitrate. If no PCR PID is found
simple bitrate measurement over a couple of seconds is used.
VBR
In this mode the unit attempts to read data from the input buffer at the rate entered in
the Max VBR bitrate input. If the incoming rate is higher than this a buffer overflow
alarm will be triggered.
FAST COARSE
In this mode the units attamps to set up the regulator very fast on the expense of
possible jitter on the output. For ASI output this may initially create jitter outside of
the specification and should only be used when having IP -
>
IP transmission.
Expected PCR accuracy
The expected clock accuracy of the PCR in the input signal. The configured value affects
how far off the initial bitrate (determined from the incoming PCR) the buffer regulator
may adjust the output bitrate to compensate for input latency. The default value (25ppm)
should be sufficient to handle signals from professional DVB equipment at the same time
guaranteeing that the output bitrate does not deviate beyond 25ppm. If you want to
synchronise to streams coming from sources with less accurate clocks, you may have to
configure a wider operation range to allow the output clock to be tuned further off to avoid
buffer over-/underflow.“