 | | Superseded ITU-T Recommendations| Series D Recommendations - General tariff principles | | | Series E Recommendations - Overall network operation , telephone service, service operation and human factors | | | Series F Recommendations - Telecommunication services other than telephone | | | Series G Recommendations - Transmission systems and media, digital systems and networks | | | Series H Recommendations - Line transmission of non-telephone signals | | | Series J Recommendations - Transmission of television, sound programme and other multimedia signals | | | Series I Recommendations - Integrated Services Digital Networks (ISDN) | | | Series M Recommendations - Maintenance: transmission systems, telephone circuits, telegraphy, facsimile, ..... | | | Series N Recommendations - Maintenance: international sound programme and television transmission circuits | | | Series P Recommendations - Telephone transmission quality, telephone installations, local line networks | | | Series Q Recommendations - Switching and Signalling | | | Series T Recommendations - Terminal characteristics and higher layer protocols for telematic... | | | Series V Recommendations - Data communication over the telephone network | | | Series X Recommendations - Data networks and open system communication | |
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