SYSC 3303 Study Guide - Final Guide: Dial Tone, Ringing Tone, Telephone Exchange

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A telephone switch monitors the phone lines connected to it, and establishes connections (phone calls) between pairs of telephones. Suppose you are part of the team designing the software for a new generation of digital telephones and telephone switches. Instead of sending analogue signals, these components communicate by sending packets of bytes over the phone lines. For example, when a person picks up a phone to make a telephone call, this source phone sends an. The dial tone that the user hears is caused by the switch sending a "dial tone" packet to the phone. To indicate where the responsibilities occur, label the path(s) in the ucm "1", "2", "3", etc. , using the same numbers that are used in the list of responsibilities above. Again, this signal is sent until the source phone goes back on hook . You need only show two components: the source phone and source"s local switch, and the responsibilities corresponding to them.