How to correctly designing the wan bandwith for OCS with multi-sites RRS feed

  • Question

  • Hi All,


    I've some big troubles for correctly desing the bandwith for The OCS uses needed.


    I've a big project with multiple sites are connected with MPLS Wan. I've design a correct datacenter for 30K Users (FE,EDGE.. F5 BigIP....etc) but i' don't have the really good method to evaluate


    All my remote sites havent 1 or 2 Mb guaranteed flow for 98% Time, i have some Qos but i don't have some specific Voice Classe or Video Classe.


    My question, is i know that All MS OCS protocol is elastic but how to:


    - calcute the bandwith ? How to do this ? I've read a lot of informations (from ms or not) about this but all the time, we see some different BP (example: for RTAudio, for Roundtable ... etc). Is it a good way, to estimate this, as similare Erlang for VoIP ? ... do u have a tool or excel spreadsheet ?


    - Do or not, need to buy some Voice Classe for constant quality ? Because in Europe it's very very very EXPANSIVE.


    - can i consider some different scenario to estimate the bandwith:


    Number 1: Qos MAX (need Voice Classe for all OC Traffic; im, P2P Vidéo, 360 ...Etc).

    Number 2: Qos Max only for Voip and Best Effort for Video

    Number 3: Qos MAx only for VoIP and limit the number of concurrent Livemeting session for a remote site to the datacenter.


    Thanks for your feedback and please ... i prefer your feedback and not some Link on MS Docs ...


    Best Regards.

    Wednesday, June 18, 2008 9:44 PM

All replies

  • Pquatre,


    I have a basic capacity planning and bandwidth calculator that you can use.  It can be found here.  It's simple but should give you the bandwidth estimates you need.



    Wednesday, June 18, 2008 10:54 PM
  • Thanks Mike for your reply.


    In fact, i think your calculator is for the bandwith for a server not for designing the wan Connection. Correct ?




    Thursday, June 19, 2008 6:33 AM
  • Right, this version is very basic and simply gives you bandwidth information for the entire user base of a server/pool based on the usage concurrency that you define.  It does not break it out into multiple sites.  However, if you have a total user base of say, 50,000 users and want to know the bandwidth requirements for a 10,000 user site that matches the overall usage concurrecy pattern you specified then you could simply divide the total bandwidth by 5.

    Thursday, June 19, 2008 4:44 PM
  • Hi Pquatre,
    Did you get more insight on this question? I am dealing with similar issues right now and cannot find good statements from MS on:
    1)WAN traffic flows related to the use of OCS (Audio, video, conferencing)
    2)Related QOS mechanisms and recommendations
    3) role and traffic implication of using an
    AV edge
    4) optimization gains using distributed servers for WAN capacity optimization

    Friday, October 31, 2008 11:50 AM
  • You will find good codec requirements information in this whitepaper

    Quality of Experience Paper





    Wednesday, November 12, 2008 10:41 PM