RFC 4197, "Requirements for Edge-to-Edge Emulation of Time Division Multiplexed (TDM) Circuits over Packet Switching Networks", October 2005

Errata ID: 1534
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: Immad Mir
Date Reported: 2008-10-02
Held for Document Update by: Stewart Bryant

Section 4.3 says:

          +---------------+               +---------------+
          |      PE1      |               |      PE2      |
       K  |   +--+        |               |        +--+   |  G
       |  |   | J|        |               |        | H|   |  |
       v  |   v  |        |               |        v  |   |  v
   +---+  | +-+  +-+  +-+ |  +--+   +--+  | +-+  +-+  +-+ |  +---+
   |   |  | |P|  |D|  |P| |  |  |   |  |  | |P|  |E|  |P| |  |   |
   |   |<===|h|<:|e|<:|h|<:::|  |<::|  |<:::|h|<:|n|<=|h|<===|   |
   |   |  | |y|  |c|  |y| |  |  |   |  |  | |y|  |c|  |y| |  |   |
   | C |  | +-+  +-+  +-+ |  |  |   |  |  | +-+  +-+  +-+ |  | C |
   | E |  |               |  |S1|   |S2|  |               |  | E |
   | 1 |  | +-+  +-+  +-+ |  |  |   |  |  | +-+  +-+  +-+ |  | 2 |
   |   |  | |P|  |E|  |P| |  |  |   |  |  | |P|  |D|  |P| |  |   |
   |   |===>|h|=>|n|:>|h|:::>|  |::>|  |:::>|h|:>|e|=>|h|===>|   |
   |   |  | |y|  |c|  |y| |  |  |   |  |  | |y|  |c|  |y| |  |   |
   +---+  | +-+  +-+  +-+ |  +--+   +--+  | +-+  +-+  +-+ |  +---+
    ^  ^  |   |  ^        |               |        |  ^   |  ^  ^
    |  |  |   |B |        |<------+------>|        |  |   |  |  |
    |  A  |   +--+        |       |       |        +--+-E |  F  |
    |     +---------------+      +-+      +---------------+     |
    |             ^              |I|               ^            |
    |             |              +-+               |            |
    |             C                                D            |
    +-----------------------------L-----------------------------+

It should say:

          +---------------+               +---------------+
          |      PE1      |               |      PE2      |
       K  |   +--+        |               |        +--+   |  G
       |  |   | J|        |               |        | H|   |  |
       v  |   v  |        |               |        v  |   |  v
   +---+  | +-+  +-+  +-+ |  +--+   +--+  | +-+  +-+  +-+ |  +---+
   |   |  | |P|  |D|  |P| |  |  |   |  |  | |P|  |E|  |P| |  |   |
   |   |<===|h|<=|e|<:|h|<:::|  |<::|  |<:::|h|<:|n|<=|h|<===|   |
   |   |  | |y|  |c|  |y| |  |  |   |  |  | |y|  |c|  |y| |  |   |
   | C |  | +-+  +-+  +-+ |  |  |   |  |  | +-+  +-+  +-+ |  | C |
   | E |  |               |  |S1|   |S2|  |               |  | E |
   | 1 |  | +-+  +-+  +-+ |  |  |   |  |  | +-+  +-+  +-+ |  | 2 |
   |   |  | |P|  |E|  |P| |  |  |   |  |  | |P|  |D|  |P| |  |   |
   |   |===>|h|=>|n|:>|h|:::>|  |::>|  |:::>|h|:>|e|=>|h|===>|   |
   |   |  | |y|  |c|  |y| |  |  |   |  |  | |y|  |c|  |y| |  |   |
   +---+  | +-+  +-+  +-+ |  +--+   +--+  | +-+  +-+  +-+ |  +---+
    ^  ^  |   |  ^        |               |        |  ^   |  ^  ^
    |  |  |   |B |        |<------+------>|        |  |   |  |  |
    |  A  |   +--+        |       |       |        +--+-E |  F  |
    |     +---------------+      +-+      +---------------+     |
    |             ^              |I|               ^            |
    |             |              +-+               |            |
    |             C                                D            |
    +-----------------------------L-----------------------------+

Notes:

From the figure, the DEC on PE1 has an emulated input AND an emulated output. It appears that the PHY on PE1 converts the Emulated traffic into Attachment Circuit.
However, the DEC should have Emulated traffic at input and Attachment Circuit at the output. Therefore the output of DEC on PE1 should be '<=' not '<:'

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