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Cell Concatenation and Latency

Cell concatenation increases network latency, which is undesirable for voice-over-ATM applications. To minimize these effects, use care in choosing values for the ATM Martini cell packing timers.

We recommend that for voice-over-ATM configurations, you select timeout values between 6 microseconds and 3 x 6 microseconds. Values within this range are generally low enough to maintain a reasonable cell delay and high enough to take advantage of the cell concatenation mechanism.

If traffic shaping is enabled on the egress router, the JUNOSe implementation of VCC cell relay encapsulation preserves the spacing between cells.


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