Subject: rfc2558 bug summary REVISION "200105080800Z"

From: Kaj Tesink <[email-masked]>
Date: Thu, 07 Jun 2001 17:06:04 -0400

>Hi,
 >
 >I have March 1999 issue of RFC2558. On page 10 in section " Line Alarm 
Indication Signal", it is written that
 >"A Line AIS failure is declared when the Line AIS defect persists for a 
period of 20.5 +/- 0.5 seconds. "
 > It should be 2.5 +/- 0.5 seconds.
 >
Regards,
Manish

thanks for spotting that bug Manish

so the bug list is now as follows:

=============================================================

     REVISION      "200106070800Z"
     DESCRIPTION
         "The key changes made to this MIB module
         since its initial publication in RFC 2558
         are as follows.

         (1) Corrected typographical error
             (bellcore1991(2) in sonetSESthresholdSet)

         (2) Added support for sts192cSTM64(6) and
             sts768cSTM256(7) in sonetPathCurrentWidth

         (3) Corrected description of the applicability
             of VTs for SDH for improved accuracy

         (4) Added clarification in the SES description that
             CV counts should be frozen during SESs

         (5) Corrected typographical error in the
             Line Alarm Indication Signal description of the
             Terminology section (20.5 --> 2.5 seconds)
             "

================================================================================
Bug report sources:
(1) many
(2) proposal by Dennis Rogers 4/19/99
     proposal by Subrahmanya Hegde 3/20/01
(3) proposal by Patrik Jarl 7/6/99
(4) proposal by Mike Heard, Francesco Pasio 5/7/01
(5) proposal by Manish Jagtap 6/7/01

================================================================================

Detailed edits:
(1)=============================================================================
  ..

(2)=============================================================================

DRAFT REVISED TEXT:
sonetPathCurrentWidth OBJECT-TYPE
     SYNTAX  INTEGER  {
             sts1(1),
             sts3cSTM1(2),
             sts12cSTM4(3),
             sts24c(4),
             sts48cSTM16(5),
             sts192cSTM64(6),
|           sts768cSTM256(7)
      }
     MAX-ACCESS  read-write
     STATUS  current
     DESCRIPTION
      "A value that indicates the type of the SONET/SDH
      Path.  For SONET, the assigned types are
|    the STS-Nc SPEs, where N = 1, 3, 12, 24, 48, 192 and 768.
      STS-1 is equal to 51.84 Mbps.  For SDH, the assigned
|    types are the STM-Nc VCs, where N = 1, 4, 16, 64 and 256."
::= { sonetPathCurrentEntry 1 }

(3)=============================================================================

2558 TEXT:
-- the SONET/SDH Virtual Tributary group

-- this group consists of 2 tables:
-- - the SONET/SDH VT Current Table
-- - the SONET/SDH VT Interval Table

-- For SDH signals, virtual tributaries are
-- called VCs instead of VTs

-- A VT1.5 = VC11
-- A VT2 = VC12
-- A VT3 = none
-- A VT6 = VC3

DRAFT REVISED TEXT:
-- the SONET/SDH Virtual Tributary group

-- this group consists of 2 tables:
-- - the SONET/SDH VT Current Table
-- - the SONET/SDH VT Interval Table

-- Corresponding SDH signals for SONET VTs are
-- as follows:

-- A VT1.5 = TU11
-- A VT2 = TU12
-- A VT3 = none
-- none  = TU3
-- A VT6 = TU2

(4)=============================================================================

DRAFT REVISED TEXT:
    Severely Errored Seconds
         According to [22][31][32][34][35] at each layer, an Severely
         Errored Second (SES) is a second with x or more CVs at that
         layer, or a second during which at least one or more incoming
         defects at that layer has occurred.  The values of x in
         RFC1595[30] were based on [22] and [32] (see Appendix B). These
         values have subsequently been relaxed in [31][34][35]. In
         addition, according to G.826 [33] SESs are measured as a
         percentage of errored blocks.

         To deal with these sets of definitions this memo defines an
         object sonetSESThresholdSet that determines the correct
         interpretation of SES. For backward compatibility, if this
         object is not implemented the interpretation of Appendix B shall
         apply.  Otherwise, a more recent interpretation is suggested.
         An agent is not required to support all sets of definitions.

|       Note that CV counts should be frozen during SESs.
|
         Note that if a manager changes the value of this object all SES
         statistics collected prior to this change shall be invalidated.

(5)=============================================================================

    Line Alarm Indication Signal
         A Line Alarm Indication Signal (L-AIS) is defined in ANSI
         T1.105.  The following criteria are specific to the L-AIS
         defect:

         --  Line AIS defect is detected as a "111" pattern in bits 6, 7,
         and 8 of the K2 byte in five consecutive frames.

         --  Line AIS defect is terminated when bits 6, 7, and 8 of the
         K2 byte do not contain the code "111" for five consecutive
         frames.

         A Line AIS failure is declared when the Line AIS defect persists
  |      for a period of 2.5 +/- 0.5 seconds.  A Line AIS failure is
         cleared when the Line AIS defect is absent for 10 +/- 0.5
         seconds.

()=============================================================================

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Kaj Tesink
Telcordia Technologies
Email  [email-masked]
Tel    732.758.5254
Fax    732.758.2269
Postal 331 Newman Springs Rd
        Red Bank, NJ 07701
        USA

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