CertiGuide to A+ (A+ 4 Real)

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: 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

Wide Area Networking (WAN)

Main Interfaces

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Version 1.0 - Version Date: March 29, 2005

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