Configuring a Demand-Dial Router
Broadband is becoming available in most metropolitan areas, but DSL is highly sensitive to the distance from the central office and digital cable is only just now being offered to businesses. Other full-time connection alternatives, such as fractional T-1s, are pricey even in an area with reasonable tariffs.
Often, the only affordable solution for branch-office or SOHO connectivity is a circuit-switched connection using modems or ISDN lines. There is no difference, at least conceptually, between routing over a circuit-switched connection or a leased line. The only practical difference is the speed and the delay as the connections are made and broken. For ISDN, this is a matter of a few hundred milliseconds. For ...
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