Table 1 - Bus Cabling; Introduction; Component Safety Precautions; Hardware Installation - Telstra Commander E105 Installation And Maintenance Manual

Introduction

Component Safety Precautions

This chapter describes the procedures for installing the Commander
E105/208+ system hardware.
It begins with an Installation Checklist that summarises all the hardware
installation procedures. Each point in the checklist is then covered in
detail, with full installation procedures and additional relevant
information. Where appropriate, an illustration and reference are
provided.
Commander E105/208+ equipment contains a considerable number of
MOS and other static-sensitive components. To reduce the incidence
of premature failure due to static discharge, ensure that you take the
following precautions.
.
Always discharge static from yourself before you handle a printed
board assembly (PBA)
.
Always disconnect power before handling or installing PBAs
.
Always handle PBAs by the edges
.
Never touch PBA tracks or edge connectors. Contaminents
introduced by fingers can cause corrosion and high-resistance
connections.
.
Never touch components. They are physically delicate and finger
pressure can fracture (but not necessarily break) components
leads.
.
Never attempt to repair power plug-packs in the field. They are
powered from the 240V mains supply and contain hazardous
voltages.
Bus cabling is polarity-sensitive. It is essential that correct polarity is
maintained. Be careful when checking voltages on cabling.
Green
Black
Blue
White
Red
Orange

Hardware Installation

1
2 Service b (-50V)
3 Llb
4 Lla
5 Service a (OV)
6

Table 1 - Bus Cabling

Chapter Four