Applies to non-accessible ID connections for which the tests and measurements of Section 3 are suitable and which are made with: - appropriately designed ID terminations; - wires having solid round conductors of 0,25 mm to 3,6 mm nominal diameter; - wires having stranded conductors of 0,05 square meter to 10 square meter cross-section; for use in telecommunication equipment and in electronic devices employing similar techniques.