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Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 13: Basic Networking Terminology
      9  Wide Area Networking (WAN)

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Main Interfaces
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WAN Connections

The main criteria at a choice of technology are required speed and price. Table 32 shows typical areas of WAN implementation and approximate throughputs of channels required to meet the application’s need.


Table 32: WAN Applications and Typical Speeds

Application

Speed

Terminal mode

300 to 9600 bps

E-mail transmission

2400 to 9600 bps

Remote Admin

9600 to 56,000 bps

Digital voice

64,000 bps

Work with databases

to 2 Mbps

Digital video

from 1.5 to 2 Mbps

Compressed video mode

from 2 to 10 Mbps

Full-screen video mode

1 Gbps and up


Plenty of ways for connections exist, which are defined by WAN technology. Depending on technology, the equipment and the provider are selected.

Table 33 lists some widespread WAN technologies and their transfer speeds.


Table 33: WAN Technologies and Transfer Speeds

WAN Technology

Speed

Dial-up (analog modem)

up to 56Kbps

X.25

9600 bps to 2 Mbps

ISDN

64,128, 544, 2,048 kbps

Framed T1

64 kbps

Framed E1

64 kbps

T1

1.544 Mbps

E1

2.048 Mbps

E3

34.064 Mbps

T3

44.736 Mbps

Frame Relay

56 kbps to 44.736 Mbps

xDSL

to 51,84 Mbps

ATM

25 Mbps to 2.46 Gbps


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