https://td-2.org/ 2026-07-28T21:20:12+00:00 https://td-2.org/ https://td-2.org/_media/wiki/logo.png text/html 2026-04-05T17:52:20+00:00 Anonymous (anonymous@undisclosed.example.com) https://td-2.org/about?rev=1775411540 About TD-2 TD-2.org is a wiki on telecommunications infrastructure and history, maintained by J. B. Crawford. The goal is to build a website along the lines of Albert La France's invaluable resource, but with multiple contributors and a plan for sustainability into the future. I am also aiming for a more convenient navigation experience, by using geotags and interlinking. text/html 2026-04-14T16:47:26+00:00 Anonymous (anonymous@undisclosed.example.com) https://td-2.org/autovon?rev=1776185246 AUTOVON AUTOVON, the Automatic Voice Network, was a military telephone network operated by AT&T. There's a lot more writing to do about it! Resources The Autovon Routing Guide or “Orange Book” (available from TCI Library) is a valuable resource. Besides an in-depth explanation of the unique text/html 2026-04-05T17:40:17+00:00 Anonymous (anonymous@undisclosed.example.com) https://td-2.org/emergency_alerts?rev=1775410817 Emergency Alerting Systems Timeline * 1951 - CONELRAD * 1963 - CONELRAD replaced by Emergency Broadcast System (EBS) * 1971 - Erroneous “Attack Warning” sent to EBS by NORAD, EBS policy changed to alerts authorized by the president only * 1976 - Emergency Broadcast System automation improved with the two-tone warning signal, state and local authorities, FEMA, and NWS added to system text/html 2026-07-06T19:22:52+00:00 Anonymous (anonymous@undisclosed.example.com) https://td-2.org/misc?rev=1783365772 Miscellaneous Utility Networks To support their long-distance transmission infrastructure, electrical utilities often operate large microwave networks. * Bonneville Power Administration Microwave Network Interesting Equipment * Passive Repeaters Interesting Concrete Towers Most AT&T microwave sites use nearly identical concrete columns (earlier sites) or steel lattice towers (later sites), but a few have architecturally interesting concrete towers. Many of these are tandem offices rat… text/html 2026-05-14T01:30:03+00:00 Anonymous (anonymous@undisclosed.example.com) https://td-2.org/passive_repeaters?rev=1778722203 Passive Repeaters Passive microwave repeaters, of the panel style made by Microflect, are well covered in this article. The below map shows reflector-type passive repeaters that are still physically present, although many are no longer in service. (you can [download this KML file]) text/html 2026-06-19T01:13:37+00:00 Anonymous (anonymous@undisclosed.example.com) https://td-2.org/resources?rev=1781831617 Resources This page aims to serve as an index of useful resources for researching telecom history. Telecom Archive telecomarchive.com has an expansive index of historic Bell System documents, including Bell System Practices (BSP) and Bell Laboratories Review (BLR), Schematic Drawings (SD), and more. text/html 2026-06-18T19:52:05+00:00 Anonymous (anonymous@undisclosed.example.com) https://td-2.org/sidebar?rev=1781812325 * Facilities * Long-Distance Carriers * Long-Distance Routes * Resources * Maps * Emergency Alerting Systems * Military Communications Systems * Miscellaneous * About TD-2 text/html 2026-04-14T23:46:53+00:00 Anonymous (anonymous@undisclosed.example.com) https://td-2.org/start?rev=1776210413 Welcome to TD-2.org, an open resource for telecommunications history. This is very much a work in progress, but my eventual hope is to welcome additional contributors and build a useful, comprehensive, and maintainable encyclopedia on the history of telecommunications in North America. See