Information Technology Reference
In-Depth Information
services to take advantage of the higher speeds. Mobile wireless technologies include
GSM, GPRS, and UMTS:
GSM:
Global System for Mobile Communications. A digital mobile radio stan-
dard that uses time-division multiplex access (TDMA) technology in three bands
(900, 1800, and 1900 MHz). The data transfer rate is 9600 bps and includes the
ability to roam internationally.
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GPRS:
General Packet Radio Service. Extends the capability of GSM speeds
from 64 kbps to 128 kbps.
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UMTS:
Universal Mobile Telecommunications Service. Also known as 3G broad-
band. Provides packet-based transmission of digitized voice, video, and data at
rates up to 2.0 Mbps. UMTS also provides a set of services available to mobile
users, location-independent throughout the world.
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Figure 6-4 shows examples of bridge wireless and wireless LANs.
Bridge Wireless
Campus Network
Wireless LANs
Figure 6-4
Wireless Implementations
Frame Relay
Relay is an industry standard networking protocol that uses virtual circuits between
