| http://www.w3.org/ns/prov#value | - Referring to FIG. 1, it will be seen that there are a number of receive time-division-multiplex (t.d.m.) highways RH1-RHN and a corresponding number of transmit time-division-multiplex highways TH1-THN. Each such highway accommodates, in a time-division-multiplex (t.d.m.) frame, 32 eight-bit channels, 30 of which are used for transmission of speech, (each channel carrying an eight-bit pulse-code-m
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