Black room
A black room is part of a communication center used by state officials to conduct clandestine interception and surveillance of communications. Typically, all letters or communications pass through the black room before being passed to the recipient. This practice had been in vogue since the establishment of posts, and was frequently used in France by the ministers of Louis XIII and his followers as cabinet noir.
In modern American network operations centers, optical splitters divert a percentage of the laser light from all incoming and outgoing fiber-optic cables to the secret room. An example is Room 641A in the SBC Communications building in San Francisco.
The term black room or black chamber has also been used to refer to any place or organisation dedicated to code-breaking.
