TVU One TM1000 v2 in V6.0 Set Up and Operating Guide
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ditions are always a factor when working over multiple connections simultaneously,
some error correction is always required. As a rule in difficult environments, the lower
the latency, the more data is required for error correction to sustain a stable video
transmission. This error correction, while highly effective, utilizes some of the limited
bandwidth that is available in most situations. It is desirable where possible to limit the
error correction required as it allows the system bandwidth for extra video quality.
Operational Example 1: TVU Transmitter is being used in a poor data service environ-
ment.
In this scenario the receiver is set to Normal VBR mode, but the TVU Transmitter is in-
side a building with poor data service. The Quality indicator is seen to fluctuate between
2048 and 1000 as the signal strength and available data service varies. This indicates
that the TVU Transmitter is using TVU's Inverse Statmux to measure the available band-
width and maximize throughput on a continuous basis. If the video quality is fluctuating
two approaches may be used at the receiver to improve the video output consistency
and stability.
Suggestions
Try increasing the delay in 1s increments to allow the TVU Transmitter extra time
to compensate for the dips in available bandwidth.
Try incrementally reducing the maximum bitrate so the fluctuations between
high and low are less noticeable.
Operational Example 2: TVU Transmitter is being used in an environment with excellent
data service.
In this scenario the receiver is set to Normal VBR mode and all data cards are perform-
ing well. The Quality indicator stays constant at 2048 and rarely fluctuates. Under these
conditions it is possible that by switching to advanced mode and either increasing the
bitrate (for improved video quality) or lowering the latency (for lower delay) may be
practical. No action is required, but the system may be capable of enhanced perfor-
mance if desired.
Suggestions
Try increasing the bandwidth in 256k increments until the Quality indicator starts
to become unstable and cannot sustain the new setting.
Try decreasing the delay in 0.2 second increments until the Quality indicator be-
comes unstable and does not stay consistent at the maximum bitrate.
Operational Example 3: TVU Transmitter is being used in an environment with average
data service.
In this scenario the TVU Transmitter is being used in an interview talkback situation. The
desire is to minimize latency but the bandwidth available to the system is limited and
