ITU-T - International Telecommunication Union/ITU Telcommunication Sector,关于a+ plus的标准
ITU-T V.61 SPANISH-1996 A SIMULTANEOUS VOICE PLUS DATA MODEM@ OPERATING AT A VOICE PLUS DATA SIGNALLING RATE OF 4800 bit/s@ WITH OPTIONAL AUTOMATIC SWITCHING TO DATA-ONLY SIGNALLING RATES OF UP TO 14 400 bit/s@ FOR USE ON THE GENERAL SWITCHED TELEPHONE NETWORK AND ON LEASED POIN
ITU-T V.61 CORR 1 FRENCH-2005 A simultaneous voice plus data modem@ operating at a voice plus data signalling rate of 4800 bit/s@ with optional automatic switching to data-only signalling rates of up to 14 400 bit/s@ for use on the General Switched Telephone Network and on leased poin