Yellow book: International Telegraph and Telephone Consultative Committee, VIIth Plenary assembly, Geneva, 10-21 November 1980 : recommendations ...
International Telecommunication Union, 1981 - Computers
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Transmission performance objectives and recommendations
Hypothetical reference connections digital network
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0dBr 2-wire switched 4-wire chain 4-wire circuits A-law analogue switching points Annex attenuation distortion balance return loss break-in cable CCITT Recommendation characteristics compandors compressor crosstalk dBm0 dBm0p defined delay design objective digital exchange digital pads directions of transmission disabling echo canceller echo loss echo path echo suppressor failure Fascicle frequency Geneva group-delay distortion hypothetical reference connections impedance input international chain international circuits international connection international exchange international telephone connections limits longitudinal maintenance Mar del Plata maximum mean value measured mixed analogue/digital national circuits national extension national networks national systems near-end crosstalk noise power nominal transmission loss Note operation output performance objective pW0p qd units quantizing distortion ratio receive path Recommendation G.121 reference equivalent residual echo speech Table telephone circuits terminating set transmission impairment transmission loss transmission systems transverse virtual analogue switching virtual switching points voltage zero relative level