Alcatel-Lucent 7705 Service Manual page 155

The buffer size must be set to at least 3 times the packetization delay and no greater than
32 times the packetization delay. Use a buffer size (in ms) that is equal to or greater than the
peak-to-peak packet delay variation (PDV) expected in the network used by circuit
emulation service. For example, for a PDV of ±5 ms, configure the jitter buffer to be at least
10 ms.
Note: The jitter buffer setting and payload size (packetization delay) interact such that it may
be necessary for the operating system to adjust the jitter buffer setting in order to ensure no
loss of packets. Thus, the configured jitter buffer value may not be the value used by the
system. Use the show>service>id service_id>all command to show the effective PDVT
(packet delay variation tolerance).
The following values are the default jitter buffer times for structured circuits, where N is the
number of timeslots:
Jitter buffer overrun and underrun counters are available for statistics and can raise an alarm
(optional) while the circuit is operational. For overruns, excess packets are discarded and
counted. For underruns, an all-ones pattern is sent for unstructured circuits and an all-ones or
a user-defined pattern is sent for structured circuits (based on configuration).
The circuit status and statistics can be displayed using the
RTP Header
For all circuit emulation channels, the RTP in the header is optional (as per RFC 5086).
When enabled for absolute mode operation, an RTP header is inserted in the MPLS frame
upon transmit. Absolute mode is defined in RFC 5086 and means that the ingress PE will set
timestamps using the clock recovered from the incoming TDM circuit. When an MPLS
frame is received, the RTP header is ignored. The RTP header mode is for TDM PW
interoperability purposes only and should be enabled when the other device requires an RTP
header.
7705 SAR OS Services Guide
• for N = 1, the default is 32 ms
for 2 ≤ N ≤ 4, the default is 16 ms
•
for 5 ≤ N ≤ 15, the default is 8 ms
•
for N ≥ 16, the default is 5 ms
•
VLL Services
command.
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