Former AT&T technician Mark Klein is the key witness in the Electronic Frontier Foundation's class-action lawsuit against the telecommunications company, which alleges that AT&T cooperated in an illegal National Security Agency domestic surveillance program.

Klein's evidence is a collection of sensitive documents he retained when he retired from AT&T. Those documents are now filed under court seal, but Wired News independently acquired and published a significant portion of them in May, 2006. Those excerpts follow. (Click on a thumbnail for a full-sized image).

Study Group 3, LGX/Splitter Wiring, San Francisco

This four-page excerpt is from a 60-page document a management technician "left lying around on top of a router," says Klein. It describes AT&T's efforts to install splitters on internet fiber optic cables at the company's San Francisco internet hub. Page 2 describes the splitter and lists the equipment at the receiving end of the tapped lines. Page 3 is a diagram depicting the tap, and page 4 details some of connections between the splitter cabinet and what Klein calls a "secret room" housing the equipment.

SIMS, Splitter Cut-In and Test Procedure

A departing AT&T technician gave this 44-page document to Klein as he cleaned out his desk. These two pages, excerpted by Klein, show AT&T re-rerouting its high speed data circuits through the splitter cabinet that performs the physics of the alleged wiretaps. The work was apparently overseen by AT&T's Network Operations Center in Bridgeton, Missouri. "SIMS" is an unexplained reference to the secret room, according to Klein.

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Cut-In and Test Procedure

These two pages, excerpted by Klein from another "Cut-In and Test Procedure" document, further illustrate AT&T re-rerouting its high speed data circuits for the surveillance, according to Klein. Page 1 diagrams the new connection through the splitter cabinet, and page two shows AT&T phasing in the fiber optic splitters on its high-speed links to other ISPs, including ConXion, Verio, XO, Genuity, Qwest,

PAIX, Allegiance, Abovenet, Global Crossing, C&W, UUNET, Level 3, Sprint, Telia,

PSINet, and the Mae West interconnect.

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