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Lync 2013 Clients, video applied bandwidth limit source RRS feed

  • Question

  • We have a single Lync 2013 Std server and single Lync 2013 Std edge server.

    Clients are Lync 2013 with latest Office updates.

    Clients connected via 1Gbps switch ports to each other and the Lync server, all on the same subnet.

    Video calls between clients are having a low bandwidth limit applied to them, usually

    Applied bandwidth limit:  350 Kbps
     Applied bandwidth source:  PreferenceValue
     

    This of course limits the video quality, often to 480x240 15FPS.

    Clients are Core i7, 2 cores (4 threads), support H264 acceleration (Intel HD Video 4000) and have WinRSAT Video Encode Score of 7.4

    CSMediaConfiguration has MaxVideoRateAllowed set to Hd720p15M, CSConferencingPolicy has VideoRateKb set to 50000

    What is the "preference value" and where is it coming from?

    Thursday, March 19, 2015 4:55 AM

Answers

  • Hi,

    AppliedBandwidthLimit - This is the actual bandwidth applied to the given send side stream given various policy settings (TURN, API, SDP, Policy Server, and so on). This is not to be confused with the effective bandwidth because there can be a lower effective bandwidth based on the bandwidth estimate. This is basically the maximum bandwidth the send stream can take barring limits imposed by the bandwidth estimate.

    More details:

    https://technet.microsoft.com/en-us/library/jj721928.aspx

    Best Regards,
    Eason Huang


    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.

    Eason Huang
    TechNet Community Support


    Friday, March 20, 2015 8:16 AM
    Moderator

All replies

  • Hi,

    AppliedBandwidthLimit - This is the actual bandwidth applied to the given send side stream given various policy settings (TURN, API, SDP, Policy Server, and so on). This is not to be confused with the effective bandwidth because there can be a lower effective bandwidth based on the bandwidth estimate. This is basically the maximum bandwidth the send stream can take barring limits imposed by the bandwidth estimate.

    More details:

    https://technet.microsoft.com/en-us/library/jj721928.aspx

    Best Regards,
    Eason Huang


    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.

    Eason Huang
    TechNet Community Support


    Friday, March 20, 2015 8:16 AM
    Moderator
  • Thanks for your reply Eason.

    What I'm asking is what is the "PreferenceValue" limit source.

    I have seen "StaticMax" which I assume means a maximum hardcoded upper limit, but the source "preferenceValue" is not documented anywhere that I have found.  Does "preferenceValue" mean the guesses that the Lync client makes about the network?

    Tuesday, March 31, 2015 12:57 AM
  • I know this is very old one, but have you ever found answer to your question? 

    I am facing same issue, but it looks like we have enough bandwidth available.

    Tuesday, February 19, 2019 9:28 AM