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ITU-T V.10 Electrical characteristics for unbalanced double-current interchange circuits operating at data signalling rates nominally up to 100 kbit/s
ITU-T Z.352 Data oriented human-machine interface specification technique - Scope, approach and reference model
ITU-T T.22 Standardized test charts for document facsimile transmissions
ITU-T M.60 Maintenance terminology and definitions
ITU-T Q.68 Overview of methodology for developing management services
ITU-T Q.72 Stage 2 description for packet mode services
ITU-T Q.84.1 Stage 2 description for multiparty supplementary services : Conference calling (CONF)
ITU-T Q.513 Digital exchange interfaces for operations, administration and maintenance
ITU-T Q.521 Digital exchange functions
ITU-T Q.541 Digital exchange design objectives - General
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