Re: [xrblock] Calculation of delay metrics defined in the Delay Block

End System Delay is part of  Network Round trip delay(Transmission Delay is another part of Network Round Trip Delay).
The End System Delay is calculate based on sending side internal Delay and receiving side internal Delay.
Sending side internal Delay = Accumulation and Encoding Delay
Reciving Side Internal Delay = Jitter Buffer Delay + Decoding and Playout Buffer Delay.
In my understanding, the End System Delay can be measured using DLSR or DLRR. We can choose mean value of DLSR and DLRR to stand
for the average End System Delay.

Regards!
-Qin
  ----- Original Message ----- 
  From: zhaojing@sttri.com.cn 
  To: xrblock 
  Sent: Friday, October 28, 2011 4:25 PM
  Subject: Re: [xrblock] Calculation of delay metrics defined in the Delay Block

  Hi, Qin:

  Would you like to explain to me how End System Delay is calculated?

  Is it based on DLSR or something else? It looks like a internal calculation.

  Regards!

  -JingZhao

    a.. From: Qin Wu <bill.wu at huawei.com> 
    b.. To: zhaojing at sttri.com.cn, xrblock <xrblock at ietf.org> 
    c.. Date: Thu, 20 Oct 2011 18:34:53 +0800 
    d.. References: <22819783.8901319076443866.JavaMail.root at ent11> 
    e.. List-id: Metric Blocks for use with RTCP's Extended Report Framework working group discussion list <xrblock.ietf.org> 

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        Hi,jing: 
        Please refere to RFC3550. 
        The round trip time computation method is defined as a example in the figure 2 of RFC3550. 

        Regards! 
        -Qin 
          ----- Original Message ----- 
          From: zhaojing at sttri.com.cn 
          To: xrblock 
          Sent: Thursday, October 20, 2011 10:07 AM 
          Subject: [xrblock] Calculation of delay metrics defined in the Delay Block 

          Hi, 
          I have read Delay draft avaiable at: 
          http://tools.ietf.org/html/draft-ietf-avt-rtcp-xr-delay-02 
          It is not clear to me how each metric is calculated, For example, 
          it is said Mean Network Round Trip Delay metric is ypically determined 
          using RTCP SR/RR? 
          I am not sure I understand the rationale? Who would like to explain a little to me? 
          Regards! 
          jing Zhao   
          ShangHai Research Institute of China Telecom Corporation Limited.  

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