Rec. ITU-T G.8312 (12/2020) Interfaces for metro transport networks
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Metro transport network interfaces
7 MTN section layer
     7.1 Frame format
          7.1.1 MTNS connectivity verification
     7.2 Rate adaptation
     7.3 Processing blocks with uncorrected forward error correction errors
8 MTN path layer
     8.1 MTNP layer forwarding
     8.2 MTNP OAM formats
          8.2.1 OAM structure
          8.2.2 Message formats
               8.2.2.1 Basic message
               8.2.2.2 Low priority messages
                    8.2.2.2.1 MTNP connectivity verification value bytes
                    8.2.2.2.2 One-way delay measurement and two-way delay measurement value bytes
                    8.2.2.2.3 Two-way delay measurement response value bytes
                    8.2.2.2.4 Client signal type value bytes
               8.2.2.3 APS message
          8.2.3 Encoding MTNP OAM messages into 66B blocks
     8.3 OAM insertion
     8.4 OAM extraction
9 MTN overhead description
     9.1 Trail trace identifiers
     9.2 MTNS overhead description
          9.2.1 Frame alignment
          9.2.2 Group composition
          9.2.3 Calendar management
          9.2.4 Management communication channel
          9.2.5 Synchronization management channel
          9.2.6 Remote PHY fault indication
          9.2.7 Reserved bits
          9.2.8 CRC-16
          9.2.9 Trail trace identifier
     9.3 MTNP overhead description
          9.3.1 Fields common to all messages
               9.3.1.1 Start and end of message indicators
               9.3.1.2 Message type
          9.3.2 Basic message
               9.3.2.1 Error detection code (MTN BIP)
               9.3.2.2 Remote defect indication
               9.3.2.3 Remote error indication
               9.3.2.4 Reserved bits
          9.3.3 Low priority messages
               9.3.3.1 Common elements
                    9.3.3.1.1 Cyclic redundancy check
                    9.3.3.1.2 Reserved bits
               9.3.3.2 Connectivity verification message
                    9.3.3.2.1 Trail trace identifier
               9.3.3.3 Delay measurement messages
                    9.3.3.3.1 Timestamp format and reference
                    9.3.3.3.2 One-way delay measurement
                    9.3.3.3.3 Two-way delay measurement
                    9.3.3.3.4 Two-way delay measurement response message
               9.3.3.5 Client signal type message
                    9.3.3.5.1 Payload type indication
                    9.3.3.5.2 Reserved bits
          9.3.4 APS message
               9.3.4.1 APS protocol
               9.3.4.2 Reserved bits and CRC-12
10 MTN maintenance signals
     10.1 MTNS maintenance signals
     10.2 MTNP maintenance signals
          10.2.1 Alarm indication signal
          10.2.2 Open connection indication
11 MTN client mappings
     11.1 Ethernet MAC based clients
Appendix I  Background on error marking in MTN
     I.1 Error marking
     I.2 Error contamination due to 66B block forwarding