VoATM (Voice over Asynchronous Transfer Mode) is a service used to transport packetized voice signals over an ATM network.[1] The voice traffic is encapsulated using AAL1/AAL2 ATM packets, when sending voice traffic over ATM.[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]
See also
Professional wide band audio over ATM. Audio Engineering Society AES47
References
- ^ a b Tamara Dean. Network+ Guide to Networks. Course Technology, Cenage 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
