Comrex ACCESS MultiRack, Руководство по эксплуатации продукта

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FIgure 17 jItter/pAcket error grAph
The left graph represents the work of the Jitter Buffer Manager . The area of most interest is the light blue area as
shown in Figure 17 , which illustrates a spread of jitter values (referenced to the current play out pointer) over the
last second. If this area covers a large span, the relative jitter is high. If the light blue section of the graph is small
or invisible over a time period, less jitter is present. Based on the historical value of this jitter figure, the buffer
manager will expand or contract the receive buffer (lengthening and shortening overall delay). The time interval
over which this measurement is assessed is called the “jitter window” and is adjustable in the Advanced Profile
editor. The work of the Jitter Buffer Manager is shown by the yellow line, which is the target buffer delay that the
system is trying to achieve, based on measurements calculated over the jitter window.
The right side of the display shows a real-time and historical representation of frame loss. If the decoder does not
receive packets in time, the chart will show a red line indicating the percentage of lost packets over the one-second
interval.
CODEC CHANNEL FIELD
Clicking on the Codec Channel field delivers information on the MultiRack’s total receive rate and transmit rate,
including information for multiple connections when applicable. When multiple transmit connections are active, this
will show an aggregate rate of all outgoing connections (
Figure 18 ).
FIgure 18 codec chAnnel
crosslock FIeld
Clicking on CrossLock opens a set of real-time graphs which monitor the status of the optional CrossLock reliability
layer. These fields will not appear when non-CrossLock connections are active. These stats are a powerful tool
for monitoring and diagnosing the quality of connections, as well as for managing the delay settings during the
connection.