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NFPA (Fire) 903...
EIA JESD 302:1965 (R2009) Ranges and...
ITU-T Q.138 Instruments for checking equipment and measuring signals
ITU-T Q.328 Routine testing of equipment (local maintenance)
ITU-T G Supplement 28 III.4 Application of transmultiplexers, FDM codecs, data-in-voice (DIV) systems and data-over-voice (DOV) systems during the transition from an analogue to a digital network
ITU-T Q.472 Termination of interregister signalling; At the last incoming R2 register situated in a transit exchange
ITU-T Q.478 Relay and regeneration of R2 interregister signals by an outgoing R2 register in a transit exchange
ITU-T Q.164 Test equipment for checking equipment and signals