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ITU-T Q.292 Security arrangements; Reserve facilities provided
ITU-T G Supplement 36 III.5 Jitter and wander accumulation in digital networks
ITU-T Q.259 Signal unit formats and codes; Signalling-system-control signals
ITU-T Q.452 Multifrequency signalling equipment; Requirements relating to transmission conditions
ITU-T Q.265 Speed of switching and signal transfer in international exchanges