Terminology Recap
- POTS
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Plain old telephone service, the basic analog phone line most folks have in their homes.
- Fax
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Facsimile, a method of sending a copy of a paper document over an analog telephone line.
- Modem
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Modulator/demodulator, a device that connects computer systems or fax machines by transmitting signals using analog signals.
- CO
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Central office, the phone company’s switching center that provides POTS service to the surrounding area.
- PCM
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Pulse ccde modulation, a way of storing an audio signal as a bit stream.
- CELP
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Code-excited linear prediction, a compression codec used in advanced VoIP codecs. CELP reduces the number of bits necessary for successful transmission of the sound, but it does so by degrading the audio signal somewhat.
