Introduction To ISDN Part IIIn the previous ISDN article, we looked at how and why one router dials another using ISDN. Just as important is knowing what keeps the link up once it is dialed.
Why? Because ISDN acts as a phone call between two routers, and it's billed that way to your client. The two routers that are connected by this phone call may be located in different area codes, so now we're talking about a long distance phone call.
If your ISDN link does not have a reason to disconnect, the connection could theoretically last for days or weeks before someone realizes what's going on. This is particularly true when the ISDN link is used as a backup for another connection type, as is commonly the case with Frame Relay. When the Frame Rela...
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