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Introduction to ISDN
Integrated Services Digital Network (ISDN) is a digital version of switched-circuit analogue telephone service. It was and developed to use the existing telephone wiring system is provided by local phone companies or PTTs
ISDN was specifically designed to solve the low bandwidth problems that small offices or dial-in users have with traditional telephone dial-in services. When a data call is made using ISDN, the WAN link is brought up for the duration of the call and is taken down when the call is completed.
ISDN is generally viewed as an alternative to leased lines, w…
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