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BS PD CEN ISO/TR 20659‑2:2024
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ITU-T Q.411
ITU-T Q.411 Line signalling code
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ITU-T Q.285
ITU-T Q.285 Signal priority categories
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ITU-T Q.478
ITU-T Q.478 Relay and regeneration of R2 interregister signals by an outgoing R2 register in a transit exchange
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ITU-T Q.164
ITU-T Q.164 Test equipment for checking equipment and signals
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ITU-T Q.421
ITU-T Q.421 Digital line signalling code
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ITU-T Q.293
ITU-T Q.293 Security arrangements; Intervals at which security measures are to be invoked; Changeover and changeback procedures; Emergency restart procedure; Full-time synchronized reserve links; Load sharing method
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ITU-T Q.255
ITU-T Q.255 Signalling-system-control signals
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ITU-T Q.441
ITU-T Q.441 Interregister signalling; Signalling code
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ITU-T Q.124
ITU-T Q.124 Splitting arrangements
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ITU-T Q.454
ITU-T Q.454 Multifrequency signalling equipment; The sending part of the multifrequency signalling equipment
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ITU-T Q.260
ITU-T Q.260 Signal unit formats and codes; Management signals
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ITU-T Q.311
ITU-T Q.311 2600 Hz line signalling
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