思科 cisco - SDH（光端机）英文版产品资料手册

思科 cisco - SDH（光端机）英文版产品资料手册 Cisco ? Synchronous Digital Hierarchy (SDH) Graphical Overv Cisco ? Synchronous Digital Hierarchy (SDH) Graphical Overview Table of Contents Synchronous Digital Hierarchy (SDH) Graphical Overview..........................................................................1 Introduction.............................................................................................................................................1 Before You Begin...................................................................................................................................1 Conventions...............................................................................................................................1 Prerequisites...............................................................................................................................1 Components Used......................................................................................................................1 SDH Analysis.........................................................................................................................................1 The SDH Link............................................................................................................................2 STM1 Frames............................................................................................................................2 STM1 SOH................................................................................................................................2 VC4 Concatenation....................................................................................................................3 SDH Hierarchy..........................................................................................................................3 SDH Maintenance Interactions..................................................................................................4 Alarms and Detection Criteria...................................................................................................4 STM1 SOH, HO?POH and LO?POH Bytes.............................................................................5 Related Information..............................................................................................................................12 i Synchronous Digital Hierarchy (SDH) Graphical Overview Introduction BeforeYouBegin Conventions Prerequisites Components Used SDHAnalysis The SDH Link STM1 Frames STM1 SOH VC4 Concatenation SDH Hierarchy SDH Maintenance Interactions Alarms and Detection Criteria STM1 SOH, HO?POH and LO?POH Bytes RelatedInformation Introduction This document provides an overview of Synchronous Digital Hierarchy (SDH) represented in images. Before You Begin Conventions For more information on document conventions, see the Cisco Technical Tips Conventions. Prerequisites There are no specific prerequisites for this document. Components Used This document is not restricted to specific software and hardware versions. The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it. SDH Analysis The sections below provide an overview of SDH in graphical format. Cisco ? Synchronous Digital Hierarchy (SDH) Graphical Overview The SDH Link The diagram below shows what an SDH link looks like. STM1 Frames The diagram below shows the Synchronous Transport Module level 1 (STM1) frame structure. STM1 SOH The diagram below shows what the STM1 Section Overhead (SOH) looks like. Cisco ? Synchronous Digital Hierarchy (SDH) Graphical Overview VC4 Concatenation The diagram below looks at VC4 Concatenation. SDH Hierarchy The diagram below displays the SDH hierarchy. Cisco ? Synchronous Digital Hierarchy (SDH) Graphical Overview SDH Maintenance Interactions The diagram below shows how SDH maintenance interactions look. Alarms and Detection Criteria The table below looks at what the alarms mean and their detection criteria. Cisco ? Synchronous Digital Hierarchy (SDH) Graphical Overview STM1 SOH, HO?POH and LO?POH Bytes The diagrams below provide a description of all the bytes from STM1 SOH, High Order Path Overhead (HO?POH)and Low Order Path Overhead (LO?POH) . Cisco ? Synchronous Digital Hierarchy (SDH) Graphical Overview Cisco ? Synchronous Digital Hierarchy (SDH) Graphical Overview Cisco ? Synchronous Digital Hierarchy (SDH) Graphical Overview Cisco ? Synchronous Digital Hierarchy (SDH) Graphical Overview Cisco ? Synchronous Digital Hierarchy (SDH) Graphical Overview Cisco ? Synchronous Digital Hierarchy (SDH) Graphical Overview Cisco ? Synchronous Digital Hierarchy (SDH) Graphical Overview Related Information ,TechnicalSupport?CiscoSystems ,ToolsandUtilities?CiscoSystems ,Optical Product Support Pages All contents are Copyright ? 1992?2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Updated: Dec 13, 2002 Document ID: 28327 Cisco ? Synchronous Digital Hierarchy (SDH) Graphical Overview