Network Technologies DVB-ASI to IP - Manual (Page 53)

ASI-IP-GTW User's Manual
Page 53
Max bitrate: : If VBR rate mode is chosen, this tells the unit what
bitrate it should attempt to transmit at.
Pad with NULL packets: Checking this means that the unit, when in
VBR rate mode, will pad the output stream with NULL packets up to
the entered max bitrate.
Monitor bitrate: Checking this box will make the unit resync faster in
the case of small bitrate changes.
Init. Rate Mode: This parameter shows the initial bitrate mode that
was used at last re-sync. If you have selected PCR mode, and this
parameter shows COARSE mode, the device has not been able to find a
valid PCR PID on the signal.
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
analyzed to check if a better estimation 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 phase, and shows the bitrate measured for
the datastream since last re-synch. In the first minutes after a re-
synch, this measurement is highly inaccurate and dependent on IP
network jitter. 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 bitrate target the regulator is operating.
Mode: Here you can configure the unit to transmit ASI data using burst
or spread mode. Note that spread mode only works with bitrates up to
72Mbit/s. If you choose spread mode and a transmit a higher bitrate,
the signal will become a burst/spread hybrid.
No lock mode: This parameter lets you choose what the unit should
transmit on the ASI port when it has no lock. You can choose to send
idle bytes or turn the port completely off.