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facilities:microwave:oak_hill [2026-05-11 18:47] – J. B. Crawfordfacilities:microwave:oak_hill [2026-05-11 18:48] (current) – J. B. Crawford
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 Oak Hill didn't just serve microwave, the 1979 route map appears to depict a north-south L-carrier cable passing through. Other mailing list posts suggest that this cable was rerouted to appear at Oak Hill during the later part of the 1970s, as AT&T continued to relocate more equipment to the remote site. It is not thought that there was ever power feed equipment at Oak Hill, due to its close proximity to the San Jose CO, but Oak Hill may have had equipment to exchange groups or supergroups between the cable and microwave. Oak Hill didn't just serve microwave, the 1979 route map appears to depict a north-south L-carrier cable passing through. Other mailing list posts suggest that this cable was rerouted to appear at Oak Hill during the later part of the 1970s, as AT&T continued to relocate more equipment to the remote site. It is not thought that there was ever power feed equipment at Oak Hill, due to its close proximity to the San Jose CO, but Oak Hill may have had equipment to exchange groups or supergroups between the cable and microwave.
  
-Another point of interest about the Oak Hill site is the presence of early encryption equipment, documented by interior photos at Long-Lines.net (see below). Similar equipment appears at some other microwave sites (including, reportedly, Bernal Heights) and is thought to be an artifact of a Cold War program in which AT&T encrypted select microwave links near possible Soviet/Russian intelligence collection centers. The equipment in the Bay Area was presumably in response to the Consulate General of Russia in San Francisco, which included apparent SIGINT equipment on the roof.+Another point of interest about the Oak Hill site is the presence of early encryption equipment, documented by interior photos at Long-Lines.net (see below). Similar equipment appears at some other microwave sites (including, reportedly, Bernal Heights) and is thought to be an artifact of a Cold War program in which AT&T encrypted select microwave links near possible Soviet/Russian intelligence collection centers. The equipment in the Bay Area was presumably in response to the Consulate General of Russia in San Francisco, which included apparent SIGINT equipment on the roof. The "For Future Use" stickers on the encryption equipment (apparently present at other sites as well) calls into question how far the deployment of this encryption system ever got.
  
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