Sprint Voice Transport Over ATM Network: Real-Time Implementation
Khoi Nguyen, D.W. Petr, Joseph Evans, Victor S. Frost · 1995
As ATM (Asynchronous Transfer Mode) is coming in the near future, accompanied by its high-speed transmission and switching backbone, real-time multimedia applications such as teleconferencing have found it a good match for voice and data transport. Telephone-grade speech, conventionally transported over a circuit-switch telephone network, is no exception in finding multimedia potential in ATM. In fact, using the AAL1 (ATM Adaptation Layer Type 1) for constant bit rate services, transporting 64 Kbits/s PCM voice over an ATM network has been widely supported and researched. This report describes the real-time implementation of the neccessary interfaces when such a transportation is not only over the ATM network but also over the existing PSTN (Public Switched Telephone Network). In this case, the ATM network will serve as an intermediate network for which voice quality accessments under controlled cell loss and delay conditions can be made. In particular, there are two interfaces that mu...