it is desirable to measure the performance of cable systems for frequency-division multiplex telephony under conditions closely approaching those of actual operation
ITU-T G.228-1993 Referenced Document
ITU-T G.223 ASSUMPTIONS FOR THE CALCULATION OF NOISE ON HYPOTHETICAL REFERENCE CIRCUITS FOR TELEPHONY
ITU-T G.228 MEASUREMENT OF CIRCUIT NOISE IN CABLE SYSTEMS USING A UNIFORM - SPECTRUM RANDOM NOISE LOADING
ITU-T G.228-1993 history
1993ITU-T G.228-1993 MEASUREMENT OF CIRCUIT NOISE IN CABLE SYSTEMS USING A UNIFORM - SPECTRUM RANDOM NOISE LOADING