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The plain old telephone system doesn't handle large quantities of data, and the phone companies realized this a long time ago. So the ISDN spec was hammered out in 1984 to allow for wide-bandwidth digital transmission using the public switched telephone network. Under ISDN, a phone call can transfer 64 kilobits of digital data per second.
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Service
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Dedicated
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Price/month
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ISDN 128k Personal Service
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No
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$39.95
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ISDN Subnet 128k
"Business Hours"
12/hr. per day connection
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Yes
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$200.00
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ISDN Subnet 128k
24/hr. per day connection
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Yes
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$300.00
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