[xrblock] [Technical Errata Reported] RFC6958 (4424)

RFC Errata System <rfc-editor@rfc-editor.org> Tue, 21 July 2015 11:49 UTC

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Subject: [xrblock] [Technical Errata Reported] RFC6958 (4424)
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The following errata report has been submitted for RFC6958,
"RTP Control Protocol (RTCP) Extended Report (XR) Block for Burst/Gap Loss Metric Reporting".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata_search.php?rfc=6958&eid=4424

--------------------------------------
Type: Technical
Reported by: Varun Singh <varun.singh@iki.fi>

Section: 3.1

Original Text
-------------
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |            Packets Lost in Bursts             |    Total...   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | ...Packets Expected in Bursts |    Number of Bursts   | Sum of|
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                ...Squares of Burst Durations (ms-squared)     |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Corrected Text
--------------
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |            Packets Lost in Bursts             |    Total...   
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
           Packets Expected in Bursts |        Number of Bursts       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Sum of Squares of Burst Durations (ms-squared)  
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       ...    |                    reserved                           |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Notes
-----
The packet format on Section 3.1 shows 12 bits,  however 
section 3.2 defines the "Number of bursts" as a 16 bits 
length field.

Relevant text from Section 3.2 pasted below:

  Number of Bursts: 16 bits

    The number of bursts in the period of the report (Interval or
    Cumulative).

    The measured value is an unsigned value.  If the measured value
    exceeds 0xFFFD, the value 0xFFFE MUST be reported to indicate 
    an over-range measurement.  If the measurement is unavailable, 
    the value 0xFFFF MUST be reported.

Instructions:
-------------
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--------------------------------------
RFC6958 (draft-ietf-xrblock-rtcp-xr-burst-gap-loss-12)
--------------------------------------
Title               : RTP Control Protocol (RTCP) Extended Report (XR) Block for Burst/Gap Loss Metric Reporting
Publication Date    : May 2013
Author(s)           : A. Clark, S. Zhang, J. Zhao, Q. Wu, Ed.
Category            : PROPOSED STANDARD
Source              : Metric Blocks for use with RTCPs Extended Report Framework RAI
Area                : Real-time Applications and Infrastructure
Stream              : IETF
Verifying Party     : IESG