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1Chapter
Access Networks
is chapter is an overview of different architectures of fixed, mobile, and wire-
less networks that provide solutions to support mobility for many users, including
air interfaces such as GSM, GPRS, UMTS (cellular networks), and other wireless
architectures that support mobility (ad-hoc networks). Each network architecture
model is illustrated and explained. en, the advantages and disadvantages of these
network architecture models are discussed.
Public Switched Telephone Network (PSTN)
e public switched telephone network (PSTN) is the most familiar network for
conversational voice. It is a copper-based, wired, time divi ...