TELEPHONE CENTRAL OFFICES
TEXAS CENTRAL OFFICES
DALLAS "MAIN" CENTRAL OFFICE
SOUTHWESTERN BELL (SBC) TANDEM and AT&T TOLL OFFICE
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Thanks to Brad Cobo for his photos
The Dallas "Main" central office serves Southwestern Bell (SBC) as the main regional tandem and AT&T for long distance and toll services in the Dallas Texas region. The office was originally built by Southwestern Bell in the 1920s. Dallas became an AT&T Long Lines microwave hub when TD-2 microwave service was introduced in the early 1960s. Phoenix was a regional center in the hierarchy switching plan and had direct trunk groups to the Denison, Longview and Houston primary offices and trunks to the Oklahoma City, Ft. Worth, San Antonio and Sweetwater sectional offices. Original L-3 coax cable connected Dallas to Ennis, Kaufman, Adams, Ft. Worth, san Antonio and Cisco. AT&T introduced 4ESS service to the office in 1976 (Dallas 3) and 1981 (Dallas 4). Today the CO has major fiber connections to Plano, Irving, Tulsa, Oklahoma City, Ft. Worth, Abilene, Houston and Austin.
Microwave paths from Dallas were: Grapevine, Adams, Terrell, Midlothian and Forth Worth Junction.
Overall Dallas skyline.
From a distance, note elevated microwave platform.
Building face, direction unknown. Note TD horns.
Original building constructed in the 1920s.
Newer AT&T addition.
Another side view.
Close-up of microwave structure on roof. A few of the horns can just be seen.
AT&T logo on marble facade and classic southwestern bell logo still present.
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