Data Network Rates
The “fundamental rate” of 64 kb/s derives from taking a 4-kHz voice signal (telecom), sampling into 8-bit wide bytes (32 kb/s), and doubling to allow for a full-duplex channel (64 kb/s). In other words, this is the minimum data rate required to reproduce a two-way voice conversation over a telephone line. All of the subsequent data rates are standardized as multiples of this basic rate.
Note: framing bit overhead accounts for the bit rates not being exact multiples of DS0).
STS/OC is the SONET physical layer ANSI standard. STS refers to the electrical signals and OC (optical carrier) to the optical equivalents. ...
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