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Jitter refers to variance in latency The latency associated with a given media stream channel may be constant (in which case there is no jitter) or it may change from moment to moment For example, switching fabric implementations that packetize the media stream and are capable of routing each packet through a distinct path will have non-zero jitter as the delay associated with each delivery path will vary Figure 8-5 illustrates the concept of jitter as the uncertainty or range of possible latency values that results from all the individual variations in the latency associated with a particular switching fabric implementation It should be noted that switching components can be built to eliminate jitter by storing, or buffering, media stream data (increasing latency) and forwarding it at a constant rate
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At the heart of the switching resources within a given telephone system is a media stream interconnection resource (or in larger systems, multiple media stream interconnection resources)
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The first generation of switching function implementations were not just mechanical, they were human-mechanical systems The mechanical part of the system consisted of a patch panel known as a switchboard or cord board It consisted of cords with plugs on them and jacks into which the plugs could be inserted The cords and jacks corresponded to various individual telephone circuits A person was responsible for detecting each request for service from a given circuit, answering it verbally (this was the principal form of signaling) and manually making the connection by plugging the appropriate cord into the appropriate jack The first generation of automated mechanical switching involved what was called step-by-step or progressive control In this approach the signaling on the telephone circuit consisted of a sequence of pulses and pauses which corresponded to a telephone number of a desired party More importantly however, this sequence of pulses directly controlled the switching operation itself Step-by-step switches are made up of thousands of individual switching modules, or selector units Each of these consist of a wiper assembly which is mechanically rotated by a relay The relay is controlled by the pulses on the line The first digit sent down the line rotates the mechanical switch in a 1st selector unit which then connects the circuit to a 2nd selector unit For each digit dialed another selector unit is connected to the circuit The last digit on the last selector unit connects the circuit to the desired destination circuit
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The problem with the step-by-step switch (aside from the fact that it was slow, noisy, and subject to mechanical failure) was the fact that the signaling actually drove the switching process itself so that there was effectively no call processing resource in the picture The signaling had to identify the exact sequence of switches to be activated to make the
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The inventor of the step-by-step switch was Almon B Stowger So these switches are generally known as Stowger switches Stowger was an undertaker in Kansas City Missouri in 1889 When potential customers wanted to contact him at his funeral parlor they would pick up the telephone and ask the switchboard operator to connect them to the funeral parlor Unfortunately, the telephone company appeared to be connecting most such calls to his competitor's funeral parlor When he learned that the telephone operator was actually the wife of the other funeral parlor's owner, he decided to develop the technology to eliminate the human operator He patented his invention in 1891 and by 1978 23 million subscribers in the US alone were connected to Stowger switches
desired connection This approach certainly was not user friendly nor was it scalable Most importantly, it didn't allow the addition of any functionality beyond the switching itself
The next key step in the evolution of switching technology was the concept of the switch matrix or crosspoint matrix A switch matrix is pictured in Figure 8-6 It consists of a number of inputs and a number of outputs Each crossing point in the matrix represents a switch that can be activated to connect the corresponding input to the output Switching based on the matrix concept are known as space division switching because multiple media streams share the switching fabric by being physically separated in space
An implementation in which the number of outputs is at least as great as the number of inputs is known as a non-blocking switch because if all inputs are in use, an output is available for each one An implementation with fewer outputs than inputs, a blocking switch, may occasionally be unable to complete a switching operation because all switch matrix outputs are in use
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