Transcon Line

By Bart Magoffin; posted February 7, 2009

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State-of-the-art AT&T construction in the 1930's and 40's, 12-channel carrier on each of the clear carrier glass(Pyrex 128's) pairs, and the "pole pairs", with Tatum #1's were 3-line Phantom groups. Big stuff back then! Today we place ump-teen thousand voice and data circuits on a single strand of glass fiber a big as your hair.