Cabinetdistribution over a data network Page183 of 544
Option11C and 11C Mini Technical ReferenceGuide
PDV Jitter Buffer
Packet Delay Variation (PDV) jitter buffer is used to smooth out any
variations in the arrival rate of the UDP/IP voice packets with respect to the
rate at which the voice samples are played. The minimum and maximum
values for excellent voice quality are given in Table56 on page 179.
The PDV jitter buffer is also used to re-sequence out of order voice packets.
Note 1: If you experience buffer underflow errors or clicking and
popping noises on a voice call, the size of the PDV buffer needs to be
increased.
Note 2: Increase the PDV buffer as little as possible (0.5 ms) in order to
keep the round trip delay as short as possible. The goal is to operate with
as small a buffer as possible to keep the round trip delay as short as
possible.
Table 5 7
Bandwidth Requirements
Talk Slo t Voice Traffic
(Mbps)
Signaling
Traffic (Mbps)
Total
(Mbps)
320 23.5 0.5 24.0
160 13.3 0.5 13.8
75 7.8 0.5 8.3
40 5.6 0.5 6.1
16 4.1 0.5 4.6
00.0 0.11 0.11
CAUTION
Excessive delay will cause a degradation in voice quality in the form
of echo.