Voice over Asynchronous Transfer Mode (VoATM) is a data protocol used to transport packetized voice signals over an
Asynchronous Transfer Mode
Asynchronous Transfer Mode (ATM) is a telecommunications standard defined by American National Standards Institute (ANSI) and ITU-T (formerly CCITT) for digital transmission of multiple types of traffic. ATM was developed to meet the needs of ...
(ATM) network.
[Tamara Dean. ''Network+ Guide to Networks''. Course Technology, Cenage Learning, 2010, p. 533.] In ATM, the voice traffic is encapsulated using AAL1/AAL2 ATM packets.
VoATM over DSL
Voice over Asynchronous Transfer Mode (VoATM) is a data protocol used to transport packetized voice signals over an Asynchronous Transfer Mode (ATM) network.Tamara Dean. ''Network+ Guide to Networks''. Course Technology, Cenage Learning, 2010, p. 5 ...
is a similar service, which is used to carry packetized voice signals over a
DSL
Digital subscriber line (DSL; originally digital subscriber loop) is a family of technologies that are used to transmit digital data over telephone lines. In telecommunications marketing, the term DSL is widely understood to mean asymmetric di ...
connection.
Protocols
*
ATM Adaptation Layer 1
An ATM Adaptation layer 1 or AAL1 is used for transmitting Class A network traffic, that is, real-time, constant bit rate, connection oriented traffic (example- uncompressed audio and video). Bits are fed in by the application at constant rate and ...
(AAL1)
*
ATM Adaptation Layer 2
ATM Adaptation Layer 2 (AAL2) is an Asynchronous Transfer Mode (ATM) adaptation layer, used primarily in telecommunications; for example, it is used for the Iu interfaces in the Universal Mobile Telecommunications System, and is also used for tran ...
(AAL2)
Deployment
VoATM is a multi-service, high speed, scalable technology but rarely found because of its expensive services.
[Ahmed, Fatima]
developer.com, November 24, 2003, accessed April 26, 2011.
Prioritization
Prioritization is implemented through
Quality of service, QoS parameters.
Fragmentation
Fragmentation is built into ATM with its small, fixed-sized, 53-byte cells.
[AAL Type]
accessed April 26, 2011
Variable delay
Dynamic Bandwidth Circuit Emulation Service (DBCES) does not send a constant bit stream of cells but transmit only at an active voice call, reducing delays and variations.
Echo cancellation
VoATM transports data, voice, and video at very high speed. The same method for
echo cancellation
Echo suppression and echo cancellation are methods used in telephony to improve voice quality by preventing echo from being created or removing it after it is already present. In addition to improving subjective audio quality, echo suppression i ...
is employed.
See also
Professional wide band audio over ATM.
Audio Engineering Society AES47
References
{{Reflist
Broadband
Videotelephony
Audio network protocols