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The highest frequency transmitted for voice communication is 4 kHz. In order to recreate the analog wave from digital stream of data, we need to sample the analog wave at twice the rate of the highest frequency, it means 8 KHz = 8000 times per second. To represent 4KHz in digital, we generate 8-bit samples 8000 times per second. (Voice channel = 64,000 bps)
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Service Class:
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DS0 the basic 64 Kbps channel in digital voice networking
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DS1 collection of 24 DS0 = 1.544 Mbps
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DS2 28 DS1 channels (this service is not commonly available)
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DS3 7 DS2 channels or 672 DS0 channels = 44.736 Mbps
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T-carrier services are traditionally dedicated, but switched services are also available. T-carrier services are typically leased on a month-to-month basis and include initial setup charge.
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