e Relay has been proposed to the CCITT as an adaption layer Simplifying the protocol functions allows the network to operate protocol for connection to ATM networks. Although it is possible to cost effectively at high speeds and low delays. Instead of connecting implement Frame Relay interfaces on time division multiplexers switches at 64kb/s, it is done at 64kb/s (V.35 or X.21 interfaces) (TDM) and packet switches to produce so called Frame Relay or with narrowband ISDN at 2Mb/s or 1.5Mb/s. Packets, instead of switches, Cell Relay platforms are by far the most efficient and being processed at intermediate switches (as would be the case with flexible partner for the Frame Relay interface. conventional packet switches), are relayed directly from the origin- Some vendors implement a frame relay to X.25 interface on their ating switch to the destination switch. The result is that the delay packet switches, which only gives the performance of a traditional incurred in relaying a packet is much less than the delay incurred in packet switched network. Time Division Multiplexers with Frame switching (software processing) a packet. Relay interfaces have the disadvantages outlined below. A packet With the implementation of Frame Relay on a Cell Relay back- switch with a different software load removing the level 3 functions bone, network bandwidth is used more efficiently. The pool of EI/TI MUX Network Figure 55.4 Conventional network without Frame Relay 55/6 Fast Packet Switching Frame Relay Switch Frame Frame Relay Relay Switch Switch Figure 55.5 Network with Frame Relay available bandwidth is shared among all applications (data, voice Better performance. Cell Relay switching together with Frame etc.). Bursty, high speed Frame Relay connections, can access the Relay offers better performance than TDMs with Frame Relay. entire network trunk bandwidth for very short intervals, and then The Frame Relay interface can operate at much higher speeds release it for other applications. This unique property of Cell Relay without 