PART
I NETWORKING BASICS
16
and of providing additional functionality, allowing the system to communicate with oth-
er operating systems via the network. Software modules, implementing networking func-
tions, were introduced into operating
systems gradually, with
advances in network tech-
nologies and computer hardware, as new tasks requiring network processing appeared.
The progress of WANs depended mainly on the progress of telephone networks.
From the late 1960s, voice transmission in a digital format became increasingly com-
mon in telephone networks.
This resulted in the arrival of high-speed digital channels that connected automatic
telephone exchange stations and allowed simultaneous transmission of tens or even hun-
dreds of conversations. Special technology was developed for the construction of
trans-
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