WAN Connection Speed Comparison

Leased line, Frame Relay 1

Cabin

DSL

ISDN—PRI

ISDN—BRI ll^HHj

Asynchronous Dialup

1 5G/64 kbps 123 kbps Ë1/T1 E3/T3

Theoretical Maximum WAN Speeds

Theoretical Maximum WAN Speeds

© 2004 Cisco Systems, Inc. All rights re

The figure illustrates the WAN speeds for typical technologies. Network administrators must select a WAN option based on the required bandwidth.

The speeds, costs, and availability of WANs vary internationally. For example, in North America, high-bandwidth speeds such as T1 are easily available at reasonable prices. Europe offers comparable speeds, such as E1, but prices tend to be higher. Other parts of the world offer limited WAN services with lower speeds, typically up to 64 kbps, and the costs are higher.

Broadband options include DSL and high-speed cable modems.

Broadband is generally defined as any sustained speed above 128 kbps. However, that definition may soon change. Broadband access can allow remote office staff and small office, home office (SOHO) users to connect to the central office LAN at high speeds.

A cable modem can provide up to 90 times the speed (4 Mbps) for remote access.

DSL is a technology that operates over unused bandwidth on a regular telephone line to deliver fast digital data transmission up to 25 times the speed (approximately 1 Mbps) without affecting the analog telephone service that is used.

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