Nortel Networks Option 11C User Manual

Page 187 of 544

Option 11C and 11C Mini

Technical Reference Guide

196

Chapter 5 — Spares planning

Contents

This section contains information on the following topics:

Reference List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Definitions and assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188

Calculating spares requirements . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189

Failure rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

NFT values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

NTAK76 battery back-up unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

NTAK75 extended battery back-up unit . . . . . . . . . . . . . . . . . . . . . . . . 195

Reference List

The following are the references in this section:

•

Option 11C and 11C Mini Fault Clearing (553-3011-500)

Introduction

Spares planning is used to determine desired inventory levels of spares
(replaceable) items. Spares planning is used by repair houses and centralized
depots in order to ensure that there is an adequate stock of replaceable items
on hand.

This section will provide the information necessary to calculate spares for the
Option 11C system.