Specifications

TDM TO ATM UPGRADE

Introduction

The Echo Canceller Module provides G.165/G.168 echo cancellation for voice over ATM applications and

is available with Adaptive Differential Pulse Code Modulation (ADPCM). ADPCM is a speech coding

method which uses fewer bits than traditional Pulse Code Modulation (PCM), allowing the user to get

more analog voice calls on less bandwidth. Echo cancellation and ADPCM resources are built into all

600 Series units except the Total Access 612/616/624 T1 TDM units (P/N 4200612L1#TDM,

4200616L1#TDM, and 4200624L1#TDM). These units may be upgraded to include echo cancellation via

three methods. This DLP discusses those three methods.

Prerequisite Procedures

Purchase the EC/ADPCM (P/N 1200613L1).

Tools and Materials Required

• VT100 compatible terminal or computer with terminal emulation software

• Appropriate cable to connect terminal to the unit (customer-provided)

• DB-9 female to RJ-45 female adapter (customer provided) for connecting to the

CRAFT port on the rear

of the unit

To prevent electrical shock, do not install equipment in a wet location or during a

lightning storm.

Electronic modules can be damaged by static electrical discharge. Before handling

modules, wear an antistatic discharge wrist strap to prevent damage to electronic

components. Place modules in antistatic packing material when transporting or storing.

When working on modules, always place them on an approved antistatic mat that is

electrically grounded.

The Total Access 604/608 units and the third generation Total Access 612/616/624 units

(P/N 1203612L1, 1203616L1, and 1203624L1) come with the Echo Canceller function

built in, so there is no need for these units to be upgraded.