ITU-T Rec. G.783 (12/1990) – CHARACTERISTICS OF SYNCHRONOUS DIGITAL HIERARCHY (SDH) MULTIPLEXING EQUIPMENT FUNCTIONAL ...
FOREWORD
1 General
    1.1 Abbreviations
    1.2 Definitions
        1.2.1 Automatic laser shutdown (ALS)
        1.2.2 automatic protection switching (APS)
        1.2.3 Administrative unit (AU)
        1.2.4 Administrative unit group (AUG)
        1.2.5 Bit interleaved party (BIP)
        1.2.6 connection matrix (CM)
        1.2.7 Common management information service element (CMISE)
        1.2.8 Data communications channel (DCC)
        1.2.9 desynchronizer
        1.2.10 Frame alignment loss (FAL)
        1.2.11 Far end block error (FEBE)
        1.2.12 Far end receive failure (FERF)
        1.2.13 higher order path adaptation (HPA)
        1.2.14 higher order path connection (HPC)
        1.2.15 higher order path termination (HPT)
        1.2.16 loss of frame (LOF)
        1.2.17 loss of pointer (LOP)
        1.2.18 loss of signal (LOS)
        1.2.19 lower order path adaptation (LPA)
        1.2.20 lower order path connection (LPC)
        1.2.21 lower order path termination (LPT)
        1.2.22 multiplex section alarm indication signal (MS-AIS)
        1.2.23 Multiplex section far end receive failure (MS-FERF)
        1.2.24 multiplex section overhead (MSOH)
        1.2.25 multiplex section protection (MSP)
        1.2.26 multiplex section termination (MST)
        1.2.27 multiplexer timing generator (MTG)
        1.2.28 multiplexer timing physical interface (MTPI)
        1.2.29 multiplexer timing source (MTS)
        1.2.30 Network element function (NEF)
        1.2.31 Network node interface (NNI)
        1.2.32 out-of-frame second (OFS)
        1.2.33 overhead access (OHA)
        1.2.34 out of frame (OOF)
        1.2.35 pointer justification event (PJE)
        1.2.36 Path overhead (POH)
        1.2.37 regenerator section (RS)
        1.2.38 regenerator section overhead (RSOH)
        1.2.39 regenerator section termination (RST)
        1.2.40 section adaptation (SA)
        1.2.41 signal degrade (SD)
        1.2.42 synchronous equipment management function (SEMF)
        1.2.43 SDH physical interface (SPI)
        1.2.44 Synchronous transport module (STM)
        1.2.45 Telecommunications management network (TMN)
        1.2.46 Tributary unit (TU)
        1.2.47 Virtual container (VC)
2 Transport terminal functions
    2.1 SDH Physical Interface function (SPI)
        2.1.1 Signal flow from B to A
        2.1.2 Signal flow from A to B
    2.2 Regenerator Section Termination function (RST)
        2.2.1 Signal flow from C to B
        2.2.2 Signal flow from B to C
    2.3 Multiplex section termination function (MST)
        2.3.1 Signal flow from D to C
        2.3.2 Signal Flow from C to D
    2.4 Multiplex section protection function (MSP)
        2.4.1 Signal flow from E to D
        2.4.2 Signal flow from D to E
        2.4.3 Switch initiation criteria
        2.4.4 Switching time
        2.4.5 Switch restoral
    2.5 Section adaptation function (SA)
        2.5.1 Signal flow from F to E
        2.5.2 Signal flow from E to F
3 Higher order path functions
    3.1 Higher order Path Connection function (HPC-n)
        3.1.1 Signal flow from G to F
        3.1.2 Signal flow from F to G
        3.1.3 HPC-n for multiplexer types IIIa and IIIb
        3.1.4 HPC-n for multiplexer types Ia and IIa
        3.1.5 HPC-n for multiplexer types I, II, and IV
    3.2 Higher order path termination function (HPT-n)
        3.2.1 Signal flow from G to H
        3.2.2 Signal flow from H to G
    3.3 Higher order path adaptation function (HPA-m/n)
        3.3.1 Signal flow from J to H
        3.3.2 Signal flow from H to J
4 Lower order path functions
    4.1 Lower order path connection function (LPC-m)
        4.1.1 Signal flow from K to J
        4.1.2 Signal flow from J to K
        4.1.3 Connection matrix for multiplexer type III
    4.2 Lower order path termination function (LPT-m)
        4.2.1 Path OH at levels 1 and 2
        4.2.2 Path overhead at level 3
    4.3 Lower order path adaptation functions (LPA-m/n)
        4.3.1 Direction M to L or H
        4.3.2 Direction L or H to M
    4.4 Physical interface (PI) function
        4.4.1 Signal flow from M to tributary interface
        4.4.2 Signal flow from tributary interface to M
5 Synchronous equipment management function
    5.1 Information flow across the Sn reference points
    5.2 Filter functions
        5.2.1 One second filters
        5.2.2 Defect filter
        5.2.3 ES, SES filter
6 Timing functions
    6.1 Multiplexer timing source function
    6.2 Multiplexer timing physical interface (MTPI) function
        6.2.1 Signal flow from MTS to synchronization interface
        6.2.2 Signal flow from synchronization interface to MTS
7 Specification of jitter and wander
    7.1 STM-N interfaces
        7.1.1 Input jitter and wander accommodation
        7.1.2 Output jitter and wander generation
        7.1.3 Jitter and wander transfer
        7.1.4 Transfer of wander encoded in AU and TU pointer adjustments
    7.2 G.703 interfaces
        7.2.1 Input jitter and wander tolerance
        7.2.2 Jitter and wander transfer
        7.2.3 Jitter and wander generation
8 Overhead access function
ANNEX A – Multiplex section protection (MSP) protocol, commands and operation
A.1 MSP Protocol
A.1.1 K1 byte
A.1.2 K1 byte generation rules
A.1.3 Revertive/non-revertive modes
A.1.4 K2 byte
A.1.5 K2 byte generation rules
A.1.6 Control of the bridge
A.1.7 Control of the selector
A.1.8 Transmission and acceptance of MSP bytes
A.2 MSP commands
A.2.1 Switch commands
A.3 Switch operation
A.3.1 1 : n bidirectional switching
A.3.2 1:n unidirectional switching
A.3.3 1 + 1 unidirectional switching
A.3.4 1 + 1 bidirectional switching
ANNEX B – Algorithm for pointer detection
B.1 Pointer interpretation
B.2 Concatenated payloads
APPENDIX I – Example of F1 byte usage