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Total Access 600 Series System Manual Section 1 System Description
61200624L1-1A © 2002 ADTRAN, Inc. 21
4. RESOURCE MODULES
Echo Canceller with ADPCM
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
Total Access 604/608 units and the third generation Total Access 612/616/624 units (P/N 1203612L1,
1203616L1, and 1203624L1). The Total Access 612/616/624 T1 TDM units (P/N 4200612L1#TDM,
4200616L1#TDM, and 4200624L1#TDM) may be upgraded to include echo cancellation via three
methods:
1. The upgrade package may be purchased from ADTRAN. This package includes EC/ADPCM (P/N
1200613L1) and the ADTRAN installation and test. If this package is ordered, the customer must send
their TDM 612/616/624 unit back to ADTRAN. Once received the EC/ADPCM module is installed
along with the latest VoATM firmware. The upgraded unit is then tested and returned to the customer.
Please call ADTRAN CAPs department at 800-9-ADTRAN extension 7722 for this service.
2. An EC/ADPCM module may be purchased separately and installed by the customer. The latest VoATM
firmware may be obtained from the ADTRAN website (http://www.ADTRAN.com) and loaded into the
unit by the customer. For more detailed instructions, refer to DLP-015 TDM to ATM Upgrade.
3. For customers who plan to initially operate a TDM application, but eventually upgrade to an ATM
application, a Total Access 612/616/624 unit may be purchased with the EC/ADPCM card installed
(P/N 4200612L2#TDM, 4200616L2#TDM, 4200642L2#TDM). When the circuit is converted to ATM,
the ATM firmware must be obtained from the ADTRAN website (http://www.ADTRAN.com) and loaded
into the unit by the customer. For more detailed instructions, refer to DLP-015 TDM to ATM Upgrade.