Alcatel-Lucent 7210 SAS M Service Manual page 133

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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

The following values are the default jitter buffer times for structured circuits, where N is the

number of timeslots:

Jitter buffer overrun and under run 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 under runs, 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 appropriate show command.

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 pseudowire

interoperability purposes only and should be enabled when the other device requires an RTP

7210 SAS M 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

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