Playout Buffer; Buffer Mode Menu; Table C-12. Playout Buffer Provisioning Options - ADTRAN OPTI-6100 Installation Manual

OPTI-6100 Installation and Turn-Up Practice

Playout Buffer

The Playout Buffer (or "jitter buffer") allows the DS1/E1 to be reconstructed from the
pseudowire in the presence of packet delay variation from the packet network. This menu
allows each pseudowire to be provisioned individually, or in batches. Select a pseudowire by
entering the appropriate number, or select Set Multiple to specify a range.
Table C-12 lists the Playout Buffer provisioning options.

Table C-12. Playout Buffer Provisioning Options

Option Description
1 Buffer Mode
2 Manual Time
3 AutoOptimize Time
5 Apply

Buffer Mode Menu

Buffer Mode periodically adjusts the playout buffer depth. Any time the buffer depth is
adjusted, manual or automatically, loss of data can occur.
Table C-13 lists the Buffer Mode provisioning options.
Option Description
1 Manual
2 AutoUpdate*
3 AutoOptimize*
* = Exercise caution when using AutoUpdate or AutoOptimize.
C-14
Function
This displays the
This configures the depth of the playout buffer, in ms, if Buffer Mode is
set to Manual. Buffer depth converts to packets using the formula:
Packets = Depth (ms) × Bit Rate / Payload Size
Since packets must be buffered as a whole, the actual depth of the play-
out buffer can vary slightly from the provisioned value. If the formula
above results in fractional packets, calculations are rounded down.
The minimum packet depth is two and the maximum is 64.
This sets the period between playout buffer depth decrements, when
configured for AutoOptimize. The default is one hour.
This applies provisioning changes to the playout buffer. It is only avail-
able if any of the above options have been altered. Exiting the Playout
Buffer menu without selecting Apply discards all provsioning changes.
Table C-13. Buffer Mode Provisioning Options
Function
This configures a constant playout buffer depth. Pseudowire packets are
buffered before reconstructing the DS1/E1 data. The actual buffer size is
twice the configured depth. If the buffer overflows or underruns, the output
DS1/E1 data is replaced with all ones.
This periodically increases the playout buffer depth. If during any one-sec-
ond period there is at least one jitter buffer underrun, the buffer depth is
increased by 1 ms. The only exceptions are if the pseudowire is in a Loss
of Packet state, or if the Ethernet link is down.
This periodically adjusts the playout buffer depth. As with AutoUpdate
(above), if during any one-second period there is at least one jitter buffer
underrun, the buffer depth is increased by 1 ms. Also, if during any pro-
visioned period the packet delay variation is less than the configured buffer
depth, the buffer depth is decreased by 1 ms.
"Buffer Mode Menu" on page C-14.
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