Specifications

Section 4.3 T1 ATM UIG Total Access 600 Series System Manual
154 © 2002 ADTRAN, Inc. 61200624L1-1A
2. VOICE OVER ATM OVERVIEW
Voice over ATM (VoATM) is the technology used to transmit voice conversations over a data network
using Asynchronous Transfer Mode (ATM). There are several potential benefits to moving voice over a
data network using ATM. First, the small, fixed-length cells require lower processing overhead. Second,
these small, fixed-length cells allow higher transmission speeds than traditional packet switching methods.
ATM allocates bandwidth on demand, making it suitable for high-speed connection of voice, data, and
video services. Conventional networks carry data in a synchronous manner. Because empty slots are
circulating even when the link is not needed, network capacity is wasted. ATM automatically adjusts the
network capacity to meet the system needs.
3. VOICE OVER ATM APPLICATION
The echo canceller is used in ATM voice applications that require G.165 echo cancellation. The Total
Access 600 also contains an integrated ADPCM encoder/decoder for voice compression.
Figure 2 shows a typical VoATM application. The Total Access 600 connects to the ATM Network to
provide both voice and high speed data from a single platform.
Figure 2. Voice over ATM
Refer to the next section, Configuring the Total Access 600, for general configuration
instructions. Refer to the appendices at the end of this section for information on using the
Total Access 600 in specific applications:
• Appendix A. Voice Gateway Quick Start Procedure (Voice Turn up) on page 191.
• Appendix B. RFC1483 Quick Start (IP Routing) on page 193.
• Appendix C. RFC1483 Quick Start (IP Routing with NAT) on page 195.
• Appendix D. RFC1483 Quick Start (Bridging) on page 196.
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