Guest

Synchronous Digital Hierarchy (SDH)

Synchronous Digital Hierarchy (SDH) Graphical Overview

Document ID: 28327

Updated: Oct 01, 2006

   Print

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.

sdh_28327a.gif

STM1 Frames

This diagram shows the Synchronous Transport Module level 1 (STM1) frame structure.

sdh_28327b.gif

STM1 SOH

This diagram shows what the STM1 Section Overhead (SOH) looks like.

sdh_28327c.gif

VC4 Concatenation

This diagram looks at VC4 Concatenation.

sdh_28327d.gif

SDH Hierarchy

This diagram displays the SDH hierarchy.

sdh_28327e.gif

SDH Maintenance Interactions

This diagram shows how SDH maintenance interactions look.

sdh_28327f.gif

Alarms and Detection Criteria

This table looks at what the alarms mean and their detection criteria.

sdh_28327g.gif

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).

sdh_28327i.gif

sdh_28327j.gif

sdh_28327k.gif

sdh_28327l.gif

sdh_28327m.gif

sdh_28327o.gif

sdh_28327p.gif

sdh_28327q.gif

sdh_28327r.gif

sdh_28327s.gif

sdh_28327t.gif

Related Information

Updated: Oct 01, 2006
Document ID: 28327