Last Call Review of draft-ietf-xrblock-rtcp-xr-loss-conceal-10
review-ietf-xrblock-rtcp-xr-loss-conceal-10-opsdir-lc-morton-2014-03-27-00
Request | Review of | draft-ietf-xrblock-rtcp-xr-loss-conceal |
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Requested revision | No specific revision (document currently at 12) | |
Type | Last Call Review | |
Team | Ops Directorate (opsdir) | |
Deadline | 2014-03-28 | |
Requested | 2014-03-20 | |
Authors | Alan Clark , Glen Zorn , Claire Bi, Qin Wu | |
I-D last updated | 2014-03-27 | |
Completed reviews |
Genart Last Call review of -10
by Meral Shirazipour
(diff)
Genart Telechat review of -11 by Meral Shirazipour (diff) Secdir Last Call review of -10 by Steve Hanna (diff) Opsdir Last Call review of -10 by Al Morton (diff) |
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Assignment | Reviewer | Al Morton |
State | Completed | |
Request | Last Call review on draft-ietf-xrblock-rtcp-xr-loss-conceal by Ops Directorate Assigned | |
Reviewed revision | 10 (document currently at 12) | |
Result | Has issues | |
Completed | 2014-03-27 |
review-ietf-xrblock-rtcp-xr-loss-conceal-10-opsdir-lc-morton-2014-03-27-00
This is the OPS-DIR review of the subject draft. I note that this draft was reviewed by Vinayak Hegde for the pm-dir; he reviewed version 05 on May 31st, 2013. I find no new operational issues extending RTCP-XR with this new block, but have the following comments for clarity. Al Interval Metric flag (I): 2 bit This field is used to indicate whether the Loss Concealment metrics are Sampled, Interval or Cumulative metrics: I=10: Interval Duration - the reported value applies to the most recent measurement interval duration between successive metrics reports. I=11: Cumulative Duration - the reported value applies to the accumulation period characteristic of cumulative measurements. I=01: Sampled Value - the reported value is a sampled instantaneous value. In this document, Loss Concealment Metrics can only be measured over definite intervals, and cannot be sampled. Also, the value I=00 is reserved for future use. Senders MUST NOT use the values I=00 or I=01. If a block is received with I=00 or I=01, the receiver MUST discard the block. Since I=01 is not allowed, remove it from the list and simply retain the explanation that follows (like I=00 was omitted). (the text above occurs twice in the draft) -=-=-=-=-=-= SCS Threshold: 8 bits The SCS Threshold is defined as the percentage of packets corresponding to lost or discarded frames that must occur within a one second period in order for the second to be classified as a Severely Concealed Second. This is expressed in numeric format 0:8 and hence can represent a range of 0.1 to 25.5 percent loss or discard. A default threshold of 5% effective frame loss (50ms effective frame loss ) per second is suggested. Please provide the value of the default threshold setting. -=-=-=-=-=-=-=-