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A POTS line is analog so even though you can run a 56kbps modem, the actual data is transmitted via an analog signal. G.711 is the raw digital voice benchmark a
by adestefan 15y ago
A POTS line is analog so even though you can run a 56kbps modem, the actual data is transmitted via an analog signal. G.711 is the raw digital voice benchmark and encodes at a constant 64kbps PCM a-law or u-law ecoding (8 kHz sampling frequency x 8 bits per sample).
This is the reason why digital carrier lines are always multiples of 64. A DS-0 is one 64kbps channel, a DS-1 is 1.54 Mbps (24 * 64), an E1 is 2.048 Mbps (32 * 64), etc.