A Simple Adaptive SVC Caching Scheme for Voice Trunking Over ATM (VTOA) Applications

In Voice Trunking over ATM (VTOA) technology, the tandem is replaced by three components: Trunk Inter-Working Function (T-IWF), Control and Signaling Inter-Working Function (CS-IWF), and ATM Network. This new architecture calls for re-examination of the signaling channel delay issues, which are well-studied and wellspecified for TDM networks. In VTOA, the ATM network together with the inter-working functions act as a virtual tandem switching system, which is called "ATM-based distributed virtual tandem switching system." The aim is that the performance of ATM-based trunking network should be at least as good as TDM-based network. The cross-office delay budget must be shared among the interworking functions and the ATM network. Hence, the time for the ATM network to establish a switched virtual connection (SVC) is stringent