Administrations which decide to use for digital transmissions, and possibly also for particular types of analogue transmission, coaxial pairs smaller than the 1.2/4.4-mm coaxial pair should as far as possible choose pairs complying with the specifications given in this Recommendation. The use of these pairs is defined in Tables 1 and 2 given in the introduction to Subsection 6.2
ITU-T G.621-1993 Referenced Document
ITU-T G.621 CHARACTERISTICS OF 0.7/2.9 mm COAXIAL CABLE PAIRS
ITU-T G.621-1993 history
1993ITU-T G.621-1993 CHARACTERISTICS OF 0.7/2.9 mm COAXIAL CABLE PAIRS