Hands-On GTD-5 Live Virtual Maintenance and Troubleshooting

Course Description

This Virtual Live Instructor-Led GTD-5 course is an extensive and accelerated maintenance course with updated, full-color block diagrams and frame images. The course was designed to jump-start students with little or no switching knowledge to a competency where they can perform Level-1 card-level repair on virtually any of the main modules in the GTD-5 switching system, including the ACDC, the APCTPC complexes, the TCU (expanded non-expanded versions), the MDC, NCU, and SSW, plus all subordinate devices within the BUNW such as the ACU, ALU BLU lines, plus ATU, DCU and EDCU trunks. Ancillary equipment such as SS7 links, recorder announcers, ringing generators, and gateways such as those used for system remote-access equipment, the CPX, Extension Complex, billing, and remote switch monitoring are also discussed as needed. Troubleshooting techniques are taught pro-actively, including Maintenance-window procedures.

Other modules are discussed per the needs of the class, such as the IOM, CMU, and remotes like the RSU, RLU, and MXU, plus the important role of GR-303 compliant RDT remotes in providing voice switching for customers served by optical or digital line networks. The FTU is emphasized, so that students have an appreciation of this critical module, and how line and trunk diagnostics operate.

The GTD-5 Users Guide is used extensively, allowing students to gain confidence in how the guide is presented, and how information can be found quickly. Other key documents are used as needed, like the Product Line Reference Guide (PLRG) and Hardware Matrix Report (HDWM). Recent-Change can optionally be added to the course, to show the basics on adding lines, trunks, or interrogating switch settings (CONT PARA, EXAM LTT, etc.) plus an overview of FACTS, such as Digit Translation (PRIN DXLN), and call registers (PRIN PROT, PRIN UNPR).

Non-intrusive exercises are provided to locate various modules and cards within the switch, with a large number of previous faults solutions used to gain practical experience. Existing system faults can also be analyzed, with repair action determined by the class, and the analysis provided to the group responsible for repair, where results can later be compared to the recommended action.

Students Will Learn

Switching Fundamentals
GTD-5 Theory of Operation
Terminal Access IOM Ethernet LAN
Primary bays and modules used in the GTD-5 switching system, including different types of
remotes, SS7 connections, and different equipment versions (SSW vs. SSWE, TSW vs.
TSWE, etc.
How to use the IO OG IOMM Terminals
Various documentation including Interleaf viewer, the GTD-5 UG, and hardware docs
How to find the physical location of a fault
How to change cards in various bays
How to EXAM directory numbers, view system database, and use information to find cards
Where to find Emergency ACDC recovery procedures
Optional Recent-Change Basic Call Tracing
And much more...

Target Audience

Technical staff such as Central Office Technicians, combo techs, and those who are responsible for the
maintenance and troubleshooting of Central Office systems, plus NOCSCC personnel who must respond
to alarms. No previous switching background is required, although some familiarity with CO equipment
will be beneficial. Certain management and provisioning personnel will also benefit, providing a greater
understanding of the resources needed for the system, and how to program it.

Prerequisites

A basic understanding of telecommunications and switching principles is helpful due to the accelerated
nature of the course. Our BTS Telephony For Telecom Techs or our TDM Switching Fundamentals
courses are available for students with little or no previous telecom background.

Course Outline

Module 1: Switching Fundamentals

- T&R, E&M, 2/4/8 Wire

- Supervision & Signaling

Negative Battery

- AC & DC Superposition

- Decibels

logarithmic scale

copper & optical measurements

Digital: A/D & D/A Conversion

Nyquist Theorem

Multiplexing Samples

PCM bit depth - 8 bit

Time Division Multiplexing (TDM)

Pulse Code Modulation (PCM)

DS0, DS1, DS3

Line Coding

AC & DC Signals

- Transport: AMI, B8ZS

- Carrier Signal Comparison

- Binary & Hexadecimal overview

- PSTN & CCS7 Overview

- Why Legacy PSTN Support

Module 2: GTD-5� Theory of Operation

- Time-Space-Time

Analog-To-Digital Conversion

Time Switch (TSW)

PCMX and PCMR

Space Switch (SSW)

Time Slot Count (TSC)

SSW Matrix

Blocking & Concentration Ratio

- A Phone Call - Basic PCM

- The GTD-5� Complex

What is a GTD-5� EAX?

Extension Complex

Switch Capabilities

Processor Types: APC, TPC, TCU, RSU, RLU, MXU, RDT, SLC

Memory Types: CMU, DM

Front-End Modules

PCM Modules: BUNW, RSNW, RLNW, TSW, SSW, Sub/Superordinate Devices

Phone Call Sequence of Events

- Switch Module Exercise

Module 3: Input-Output Commands

- IO Terminals

Terminal Assignments

High Speed Terminal Limit

- GTD-5� IO Commands

Command Syntax

Operator/Device/Device Assignments

Summary

- DIAG vs ROUT

DIAG, ROUT

RUN and ITER

- PUT vs FORC

- Sample Commands

Module 4: Documentation

- Support & Provisioning Documentation

User�s Guides

Using Interleaf Worldview

Practices - AE/GTE/AGCS

Technical Specification - Bellcore, Telcordia

- Card & Equipment Documentation

GTD-5 Engineering Documents

FA, FB, FE, EL, ECD, EC, CC, RW

CRL

PLRG

HDWM

- User�s Guide Practice Exercises

Module 5 : Maintenance

- Sample Maintenance Commands

- Alarms