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To: Srexley who wrote (486)	8/18/1999 2:00:00 AM
From: Scott C. Lemon	of 626

Hello Srexley, > The Webopedia says that a T1 is 24 lines bundled together at 64kbs > each for 1.544mbs. That seems like it could handle a 411 mb file in > 267 seconds (approx 4 1/2 minutes). Are actual speeds slower than > that? Just a couple of comments ... 1. I usually use 10 bits per byte as an approximation on overhead. It's not a hard and fast rule, but makes for easy math. You can figure that 8 bits will include one start and one stop or other header information ... so 1.544Mb/sec ~= 154.4KB/sec 2. Yes ... actual speeds are slower. The reason is CIR, or Committed Information Rate, which is the rate that the phone company promises will be there. For example, I have a T1 here ... but my CIR is 800Kb. So although at times I might see faster rates, U.S. West only promises to give me 800Kb ... which is about 80KBytes/sec. Since I'm part of a frame-relay cloud, if there is a lot of traffic I'll drop to my CIR ... if no one else is using it I can get more. If I want a higher CIR then I have to pay for it ... Scott C. Lemon

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