VoATM

Voice over Asynchronous Transfer Mode (VoATM) is a data protocol used to transport packetized voice signals over an Asynchronous Transfer Mode (ATM) network.^[1] In ATM, the voice traffic is encapsulated using AAL1/AAL2 ATM packets.^[2] VoATM over DSL is a similar service, which is used to carry packetized voice signals over a DSL connection.^[1]

Protocols

ATM Adaptation Layer 1 (AAL1)
ATM Adaptation Layer 2 (AAL2)

Deployment

VoATM is a multi-service, high speed, scalable technology but rarely found because of its expensive services.^[3]

Prioritization

Prioritization is implemented through QoS parameters.^[3]

Fragmentation

Fragmentation is built into ATM with its small, fixed-sized, 53-byte cells.^[3]^[4]

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.^[3]

Echo cancellation

VoATM transports data, voice, and video at very high speed. The same method for echo cancellation is employed.^[3]

References

^ ^a ^b Tamara Dean. Network+ Guide to Networks. Course Technology, Cengage Learning, 2010, p. 533.
^ Cisco [1], Voice over ATM (VoATM)
^ ^a ^b ^c ^d ^e Ahmed, Fatima. [2], developer.com, November 24, 2003, accessed April 26, 2011.
^ AAL Types [3], accessed April 26, 2011

[Cenage1-1] Tamara Dean. Network+ Guide to Networks. Course Technology, Cengage Learning, 2010, p. 533.

[2] Cisco [1], Voice over ATM (VoATM)

[Fatima1-3] Ahmed, Fatima. [2], developer.com, November 24, 2003, accessed April 26, 2011.

[4] AAL Types [3], accessed April 26, 2011

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