[STDS-802-11-TGAK] References for 802.1AS time sync end-to-end performance over 802.11 links

[David Goodall <daveg@xxxxxxxxxxxx>]

In Nanjing we discussed the possible use of 802.11 Fine Timing Measurement by 802.1AS. Part of that discussion was the number of 802.11 links that could be in a bridged network and still meet the end-to-end performance requirements for 802.1AS.

 

For those who are interested, the 802.1AS performance requirements, e.g. jitter, wander etc, are in Annex B of 802.1AS-2011. The recommendations regarding the number of 802.11 links versus maximum end-to-end latency are in 802.1BA-2011 (Audio Video Bridging systems). The assumptions in 802.1BA are that each 802.11 link would add 20 milliseconds latency, so that two 802.11 links might be added to a bridged network which could then still meet the 50 millisecond maximum end-to-end latency for Stream Reservation Class B traffic.

 

Both 802.1AS and 802.1BA are available for download through the IEEE Get Program: http://standards.ieee.org/about/get/802/802.1.html

 

-          Dave

 

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