![One of America’s Most Important and Historical Communication Cables Runs Right Under Downtown Kalamazoo](http://townsquare.media/site/690/files/2016/08/IMAG1035.jpg?w=630&h=420&zc=1&s=0&a=t&q=89&w=980&q=75)
One of America’s Most Important and Historical Communication Cables Runs Right Under Downtown Kalamazoo
You can find interesting things sometimes by looking down. A small medal plaque on a sidewalk along Kalamazoo's Crosstown Parkway notes an important communication link right below your feet.
The plaque reads in part
AT&T
Transcontinetal Cable Route
In This Vicinity
The notice is likely to construction crews to avoid digging and disrupting this vital communications link
History of the AT&T Transcontinental Cable
AT&T began work on an interconnected cable system to link all of America in the 1930s. According to a Wikipedia article on the subject,
The initial system developed in the late 1930s had 600 voice channels, far more than could be carried by balanced pair carrier systems, and cheaper per channel for high-usage routes. This version was standardized as "Type L Telephone Carrier System" in 1938, abbreviated at "L-1" after further developments ensued. ... AT&T Long Lines built two coast to coast systems of L-3 as well as shorter ones connecting major cities, especially the big cities of the eastern United States, as a supplement to the mainstay microwave radio relay systems. Some were later upgraded to L-4, while others were simply overbuilt with a new L-5 system.
A map of early communication lines at Atlantic-Cable.com shows a cable passing through Kalamazoo on its way to Grand Rapids, at one time the northern terminus in Michigan.
BONUS VIDEO - Flooding Along Crosstown Parkway in Kalamazoo
More From WKMI
![Did You Know This Building In Downtown Kalamazoo Was Once A Brothel?](http://townsquare.media/site/690/files/2022/09/attachment-Untitled-design-2022-09-26T060338.138.jpg?w=980&q=75)
![Mark Twain Was Apparently Not A Fan Of Michigan’s Wooden Highways](http://townsquare.media/site/690/files/2022/08/attachment-fix-the-damn-roads.jpg?w=980&q=75)
![Detroit’s Ford Field Turns 20; Some Great Events but 92 Losses](http://townsquare.media/site/690/files/2022/08/attachment-GettyImages-1431357.jpg?w=980&q=75)
![An MGM Movie Short from 1949 Shows a Very Different Michigan](http://townsquare.media/site/690/files/2022/08/attachment-Screenshotter-YouTube-0%2525E2%252580%25259949%2525E2%252580%25259D.jpg?w=980&q=75)
![Michigan Has Banned the Death Penalty for Nearly 180 Years, Yet Its Last Execution Was Only 84 Years Ago](http://townsquare.media/site/690/files/2022/07/attachment-Untitled-design-22.jpg?w=980&q=75)