Mechanism
In a pure time-slot interchange switch, there is only one physical input, and one physical output. Each physical connection is an opportunity for a switching fabric to fail. The limited number of connections of this switch is therefore valuable in a large switching fabric, because it makes this type of switching very reliable. The disadvantage of this type of switch is that it introduces delay into the signals. When a packet (or byte, onLimitation
In a time-slot interchange (TSI) switch, two memory accesses are required for each connection (one to read and one to store). Let T be the time to access the memory. Therefore, for a connection, 2T time will be taken to access the memory. If there are n connections and t is the operation time for n lines, thenCustomary applications
In packet-switching networks, a time-slot interchange switch is often combined with two space-division switches to implement small network switches. In telephone switches, time-slot interchange switches usually form the outer layer of the switching fabric at a central office's switch. They take data from time-multiplexed T-1 or E-1 lines that serve neighborhoods. The T-1 or E-1 lines serve the subscriber line interface cards (SLICs) in local neighborhoods. The SLICs serve as the outer space-division switches of a modern wired telephone system.See also
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