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Trying to understand throughput for T1 and fractional T1


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#1 DnDer

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Posted 05 July 2009 - 07:58 AM

I understand a fractional T1 allows the leasing of a portion of a T1's channels. But, I also understand a T1 line, fractional or otherwise, is a single copper wire. Data is transmitted through this copper wire as a flow of electrons across the conductive material.

Here's where my head starts to explode.

Copper (assuming uniform quality the length of the wire) has a uniform conductivity. That means, no matter how much you send through the wire, it can only handle so much - we'll assign this throughput a number of 10. Now, copper wire is copper wire: It doesn't have degrees of conductivity, right? You're either sending something through it or you're not - referring to above, a ratio of 10 or 0.

How do you restrict transmission of data down a line, to get fractional anything? It's either carrying data or not? It can't half-carry data? You can't adjust how quickly copper carries electrons (and thus, data) across its materials - that would defy laws of physics? It's not like a firehose where you can control the flow of data (water).

I know it's not even really relevant to the N+. I just need to know "fractional T1 carries some of the bandwidth and channels that a full T1 can support." But I'm trying to understand the HOW of that truth. =\

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#2 CaveDweller2

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Posted 10 July 2009 - 05:54 AM

I can't splain it all but its frequencies and controlling their transmission. Think of the radio. Each station has its own frequency...each channel of a T1 has its own frequencies. So you control which are transmitted and which aren't and that gives you the fractional T1.

Least that is my understand of how it works lol. I could be completely wrong...its been known to happen :thumbsup:

Hope this helps thumbup.gif

Associate in Applied Science - Network Systems Management - Trident Technical College





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