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61200624L1-1B © 2004 ADTRAN, Inc. 239
DLP-19 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-48 female adapter (ADTRAN proprietary) for connecting to the CRAFT port on the
rear of the unit (see CRAFT Port on page 31).
Total Access 604/608 units and third generation Total Access 612/616/624 units
(P/N 1203612L1, 1203616L1, and 1203624L1) have built-in Echo Canceller capability
and do not need a hardware upgrade for TDM to ATM applications.
Refer to DLP-1, Connecting a VT100 Terminal or PC to the CRAFT Port, for details on
making a terminal connection to the Total Access 6XX.
To prevent electrical shock, do not install equipment in a wet location or during a
lightning storm.
Electronic equipment can be damaged by static electrical discharge. Before handling
modules, put on an antistatic discharge wrist strap to prevent damage to electronic
components. Place equipment in antistatic packing material when transporting or storing.
When working on equipment, always place it on an approved antistatic mat that is
electrically grounded.