Securement of optical fibers against eavesdropping using a patch panel

A secure room in which sounds are created which may contain sensitive data comprising:

• at least one cable containing optical fibers with at least a part of at least one of the optical fibers is located in the secure room so that said at least one of the optical fibers vibrates in response to the sounds in the room;
• and a patch panel in the secure room, the patch panel comprising:
• a plurality of first terminals for receiving and connecting to one end of each at least some of said optical fibers of the fiber cable;
• a plurality of second terminals each for connecting to a respective one of a plurality of outputs;
• a plurality of connections arranged such that light signals on at least some of the plurality of optical fibers are communicated between a respective one of the optical fibers and a respective one of the outputs;
• a light signal monitoring system arranged for monitoring light signals on at least some of the optical fibers;
• the light signal monitoring system including a receiver for receiving the light signals and a signal analysis system for detecting transmission along said at least some of the optical fibers to the receiver of light signals where the light signals are used for monitoring fiber vibration and/or movement which light signals provide information on said sounds in the secure room;
• and an indicator system on the patch panel responsive to the signal analysis system and providing an indication of an intrusion attempt to detect said sounds in the secure room.