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Specials
BS EN 1596:1998 Specification for...
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ITU-T P.54 Sound level meters (apparatus for the objective measurement of room noise)
ITU-T P.55 Apparatus for the measurement of impulsive noise
ITU-T P.61 Methods for the calibration of condenser microphones
ITU-T P.75 Standard conditioning method for handsets with carbon microphones
ITU-T P.76 Determination of loudness ratings; fundamental principles
ITU-T Q.120-Q.139 Specifications of signalling system No. 4
ITU-T Q.251-Q.300 Specifications of Signalling System No. 6
ITU-T Q.310-Q.332 Specifications of Signalling System R1
ITU-T Q.400-Q.490 Specifications of Signalling System R2
ITU-T Q.603 Events
ITU-T Q.605 Drawing conventions
ITU-T Q.606 Logic procedures