IT phone home: how to run up a $20K bill in two days and get away with it by blaming Cisco
ow, but the Integrated Services Digital Network offered blazing-fast speeds up to 128 kilobits per second. Yes, perUnfortunately, Elliot tells us, in the golden age of ISB all that speed came at a cost . Providers would charge flagfall per call and also charge for the length of the call. That's OK – cost of doing business, you know – but only if everything works as it's supposed to.
Say, for instance, your enterprise is using an ISDN line as backup for if its dedicated WAN fails over. If everything is configured correctly, the WAN fails, the ISDN springs into action and connects, and the IT guy fixes the WAN and switches it back. ISDN goes back into standby node and nobody even notices there was a problem.
If things are not configured correctly, the WAN fails, the ISDN springs into action, fails to connect, tries again, fails again, tries again … you get the picture. The rig Elliot oversaw could do that twice per second, at five cents flagfall per connection attempt. If no-one stops it, it can keep doing that for a weekend. You can imagine how it can add up.
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