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Table of ContentsSynchronous 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, HOPOH and LOPOH Bytes.............................................................................5
Related Information..............................................................................................................................12
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Synchronous Digital Hierarchy (SDH) GraphicalOverview
Introduction
Before You Begin
Conventions
PrerequisitesComponents Used
SDH Analysis
The SDH Link
STM1 Frames
STM1 SOH
VC4 Concatenation
SDH Hierarchy
SDH Maintenance Interactions
Alarms and Detection Criteria
STM1 SOH, HOPOH and LOPOH Bytes
Related Information
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 livenetwork, 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.
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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.
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VC4 Concatenation
The diagram below looks at VC4 Concatenation.
SDH Hierarchy
The diagram below displays the SDH hierarchy.
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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.
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STM1 SOH, HOPOH and LOPOH Bytes
The diagrams below provide a description of all the bytes from STM1 SOH, High Order Path Overhead
(HOPOH)and Low Order Path Overhead (LOPOH) .
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Related Information
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All contents are Copyright 19922002 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