December 2001
Intermediate to advanced
656 pages
27h 19m
English
Content preview from Networking Explained, 2nd Edition
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Chapter 15: Dialup and Home Networking 451
12. Time out. Why are there so many conversions? I thought the telephone com-
pany’s network is completely digital.
It is. However, unless an end-to-end digital circuit is installed (as is the case with
ISDN), the circuit between a home and the telephone company’s nearest switching station
is analog. This circuit is known by many different names. Formally, it is called the digital
subscriber loop but it is more commonly referred to as the local loop. It has also become
figuratively known as “the last mile/first mile” because, depending on one’s perspective, it
is either the last part of the network data must ...
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