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Contents
Introduction
This document provides an overview of Synchronous Digital Hierarchy (SDH) represented in images.
Prerequisites
Requirements
There are no specific prerequisites for this document.
Components Used
This document is not restricted to specific software and hardware versions.
Conventions
Refer to Cisco Technical Tips Conventions for more information on document conventions.
SDH Analysis
These sections provide an overview of SDH in graphical format.
The SDH Link
This diagram shows what an SDH link looks like.
STM1 Frames
This diagram shows the Synchronous Transport Module level 1 (STM1) frame structure.
STM1 SOH
This diagram shows what the STM1 Section Overhead (SOH) looks like.
VC4 Concatenation
This diagram looks at VC4 Concatenation.
SDH Hierarchy
This diagram displays the SDH hierarchy.
SDH Maintenance Interactions
This diagram shows how SDH maintenance interactions look.
Alarms and Detection Criteria
This table looks at what the alarms mean and their detection criteria.
STM1 SOH, HO-POH and LO-POH Bytes
These diagrams provide a description of all the bytes from STM1 SOH, High Order Path Overhead (HO-POH) and Low Order Path Overhead (LO-POH).
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Revision History
| Revision | Publish Date | Comments |
|---|---|---|
1.0 |
01-Oct-2006 |
Initial Release |
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