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]

See also

Professional wide band audio over ATM as standardized by Audio Engineering Society in AES47.