GRASS VALLEY XIP-3901, Руководство пользователя

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Configuring the XIP - 3901 - UDC - IP v1.2 Application with iControl
Redundancy Tab
Redundancy Tab
This tab allows you to view the reception state regarding SMPTE ST 2022-7 redundancy. The
primary and secondary streams, at the packet level, will work together in order to produce a
valid resulting stream. To achieve redundancy, both streams need to be in range with
respect to the receiver buffer. Adjustments can be done by applying a bigger Network
Tolerance if need be (see Timing Tab , on page 127). In the circumstance in which only one
stream is successfully received, the resulting stream will be valid as well but without any
active redundancy protection.
Buffer level Shows the amount of preloaded data stored in the receiver that is ready for use in
microseconds and in percentage. The current buffer level in microseconds shows the
minimum latency required to receive a continuous stream. The current buffer level in
percentage shows how much of the internal buffering is used to receive the current
stream.
Link Offset Shows the resulting link latency after being read out from receiver's buffer.
This measurement is the difference between the packet RTP timestamp and the PTP time
after the receiver's buffer and represents the total reception delay.
Video, Metadata, and audio link offset depends on the selected Network Tolerance.
Moreover, Audio link offset can also depend on the currently-selected Audio Mode.
Network
Tolerance
Network Tolerance is directly related to the current operating level of the video receiver’s
buffer. That is, the bigger the value, the greater the buffer usage will be.
Additional latency is then introduced as a result, thus giving a better tolerance to packet
distribution and network jitter. SMPTE ST 2022-7 Class A, wide source or software-based
sources can then be received without errors.
To optimize this parameter, start with the smallest Network Tolerance and increase it until
video, metadata, and audio streams statuses become GREEN.
NOTE: Metadata streams are automatically synchronized to the video. Incoming metadata
streams should not be delayed by more than one frame with respect to the video to be
properly synchronized. If the metadata stream is delayed by more than one frame, then it
is going to be delayed by one frame. Use the Link Offset measurement to monitor this
condition.
Audio Mode Video Group Sync: Audio is synchronized with the video stream. You might have to add
more Network Tolerance until the audio Receiver Stream Statuses are GREEN in order to
be able to receive audio streams that are delayed. Audio streams are synchronized to the
video based on the RTP Timestamp.
Audio Group Sync:
Audio reception is done without regard to video synchronization.
Audio buffer level is set automatically based on incoming Link Latency measures of all
audio streams.
A common link offset value will be selected based on the highest received link latency
(except those in synchronized mode). It will keep the worst measured link latency since a
stream was enabled, after a PTP disturbance or bootup. To force a recalculation of the link
offset, disable/enable one of your received streams.
Syntonized
Audio 1 to 4
Set to ignore Audio RTP timestamps. Audio buffer reception is then fixed to 25%. Use
these settings to manage audio streams that are not properly time stamped. Enable
syntonize for audio 1 to 4 individually.
Property Description