Why is T-1 24 Channels? (telecomm)


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for a good write-up. Essentially, it says that Bell Labs started muxing channels together, and just added more until the performance suffered, so they stopped at 24 channels.


Charles G. Gray Senior Lecturer, Information Technology Oklahoma State University - Tulsa (918) 594-8433

***** Moderator's Note *****

Sorry, that's not the real reason.

Bill Horne Moderator

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Gray, Charles
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Either a guess or a vague recollection, I'm not sure which:

The old analog mux hierarchy was based on a first-level of 24 to 1 multiplexing, and T1's designers wanted to keep the same office layout and cabling rules that grouped 24 pairs together between switching gear, transmission gear, and patch panels.

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R. T. Wurth

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