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ITU-T F Supplement 1 II.4 Definitions relating to telegraph, telematic and data transmission services
ITU-T Q.252 Functional description of the signalling system; Signal transfer time definitions
ITU-T G Supplement 34 III.5 Temperature in underground containers for the installation of repeaters
ITU-T N Supplement 6.1 IV.3 Effect on maintenance of the introduction of new components and of modern equipment design