International Standards and Conformity Assessment for all electrical, electronic and related technologies
RF and microwave passive components
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Shielded balanced cables having twin inner conductors are being used extensively in data processing systems. These cables are used to interconnect parts of computer systems which feature 2-pole screw (3/4-20 UNEF) coupled connectors having an inner diameter of outer conductor (IDOC) of 13,56 mm (0,534 in).
IEC 60169-25:1992 ED1
Radio-frequency connectors - Part 25: Two-pole screw (3/4-20 UNEF) coupled connectors for use with shielded balanced cables having twin inner conductors with inner diameter of outer conductor 13,56 mm (0,534 in) (Type TWHN)