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]
See also
Professional wide band audio over ATM. Audio Engineering Society AES47