The packetized versus physical layer approaches use different protocol layers to transport second line calls. Calls are placed into ATM or IP packets for transport over the ADSL physical layer bit stream. Calls travel within the ADSL physical layer bit stream itself . VeDSL allows telephone companies to offer residential customers true toll quality voice that is similar to a standard POTS phone call with all the additional features customers value, such as Call Waiting. Since VeDSL does not need to packetize voice signals into ATM or IP packets, it contributes less latency.
Latency refers to the delay a voice signal experiences as it travels through the phone network.
If latency becomes too high, then you begin to lose the quality of the call, because the signal delay causes normal conversation patterns to be disrupted. Our VeDSL physical layer approach improves this latency issue. Eliminates Echo Cancellation . Echo cancellation refers to the echoes that need to be eliminated if there is too much latency in the phone call. Packetized voice solutions add enough latency so that echo cancellation circuitry must be added to eliminate the echo.