This Recommendation addresses management aspects of the Synchronous Digital Hierarchy (SDH)
Network Element containing transport functions of one or more of the layer networks of the SDH
transport network. The management of the SDH layer networks is separable from that of its client
layer networks so that the same means of management can be used regardless of the client. The
management functions for fault management, configuration management, account management,
performance management, and security management are to be specified.
This Recommendation describes the management network organizational model for communication
between an element management layer (EML) Operations System and the SDH equipment
management function within an SDH network element.
The architecture described in this Recommendation for the management of SDH transport networks
is based upon the following considerations:
− SDH layer network entities (SLNE) refer to trail termination, adaptation and connection
functions as described in [ITU-T G.803],
− a network element may only contain SDH layer network entities,
− a network element may contain both SDH layer network entities (SLNE) and client layer
network entities (CLNE),
− client layer entities are managed as part of their own logical domain (e.g. PDH management
network),
− CLNE and SLNE may or may not share common message communications function (MCF)
and management application function (MAF) depending on application,− CLNE and OLNE may or may not share same agent.
The SDH management subnetwork (SMS) architecture, SDH embedded control channel (ECC)
functions, and SDH ECC protocols are specified. Detailed message sets are for further study.
The management of SDH equipment should be seen as a subset of the telecommunications
management network (TMN) described in Recommendation [ITU-T M.3000], and reference is
made to Recommendations [ITU-T Q.811] and [ITU-T Q.812] for the specification of protocol
suites to be used at external (Q) management interfaces.
This Recommendation specifies for fault management, performance monitoring, and configuration
management a library of basic equipment management function (EMF) building blocks and a set of
rules by which they are combined in order to describe a digital transmission equipment's EMF
functionality. The library defined in this Recommendation forms part of the set of libraries defined
furthermore in Recommendation [ITU-T G.783].
Not every function defined in this Recommendation is required for every application. Different
subsets of functions may be assembled in different ways to provide a variety of different
capabilities. Network operators and equipment suppliers may choose which functions must be
implemented for each application.
ITU-T G.784-2008 Referenced Document
ITU Data architecture of one software system Study Group 17
ITU-T G.774-1992 Synchronous Digital Hierarchy (SDH) Management Information Model for the Network Element View (Study Group XV) 103 pp
ITU-T G.774-2001 Synchronous Digital Hierarchy (SDH) - Management Information Model for the Network Element View Series G: Transmission Systems and Media, Digital Systems and Networks Digital Terminal Equipments - Operations, Administration and Maintenance Features of Tr
ITU-T G.781-1999 Synchronization Layer Function Series G: Transmission Systems and Media, Digital Systems and Networks Digital Transmission Systems - Terminal Equipments - Principal Characteristics of Multiplexing Equipment for the Synchronous Digital Hierarchy Group 15;
ITU-T G.783-2006 Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks (Study Group 15)
ITU-T G.805-2000 Generic Functional Architecture of Transport Networks Series G: Transmission Systems and Media Digital Systems and Networks Digital Networks - General Aspects Study Group 13
ITU-T G.806-2006 Characteristics of transport equipment ?Description methodology and generic functionality Study Group 15
ITU-T G.826-2002 End-to-end error performance parameters and objectives for international@ constant bit-rate digital paths and connections SERIES G: TRANSMISSION SYSTEMS AND MEDIA@ DIGITAL SYSTEMS AND NETWORKS Digital networks – Quality and availability targets (Study Gro
ITU-T G.827-2003 Availability performance parameters and objectives for end-to-end international constant bit-rate digital paths SERIES G: TRANSMISSION SYSTEMS AND MEDIA DIGITAL SYSTEMS AND NETWORKS Digital networks Quality and availability targets Study Group 13
ITU-T G.784-2008 history
2008ITU-T G.784-2008 (Pre-Published) Management aspects of the Synchronous Digital Hierarchy (SDH) transport network element