Date of Last Update : 16 May 1995 List of ITU-T K-Series Recommendations in force ** - Series K * Protection against interference K.1 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Connection to earth of an audio-frequency telephone line in cable K.2 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Protection of repeater power-feeding systems against interference from neighbouring electricity lines K.3 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Interference caused by audio-frequency signals injected into a power distribution network K.4 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Disturbance to signalling K.5 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Joint use of poles for electricity distribution and for telecommunications K.6 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Precautions at crossings K.7 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Protection against acoustic shock K.8 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Separation in the soil between telecommunication cables and earthing system of power facilities K.9 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Protection of telecommunication staff and plant against a large earth potential due to a neighbouring electric traction line K.10 (1993) [Rev.1] [14 pp.] [Publ.: Sep.94] Unbalance about earth of telecommunication installations K.11 (10/93) [Rev.3] [11 pp.] [Publ.: Jul.94] Principles of protection against overvoltages and overcurrents Note - C: 6/17/32 K.12 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Characteristics of gas discharge tubes for the protection of telecommunications installations K.13 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Induced voltages in cables with plastic-insulated conductors K.14 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Provision of a metallic screen in plastic-sheathed cables K.15 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Protection of remote-feeding systems and line repeaters against lightning and interference from neighbouring electricity lines K.16 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Simplified calculation method for estimating the effect of magnetic induction from power lines on remote-fed repeaters in coaxial pair telecommunication systems K.17 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Tests on power-fed repeaters using solid-state devices in order to check the arrangements for protection from external interference K.18 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Calculation of voltage induced into telecommunication lines from radio station broadcasts and methods of reducing interference K.19 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Joint use of trenches and tunnels for telecommunication and power cables K.20 (1993) [Rev.2] [11 pp.] [Publ.: Jul.94] Resistibility of telecommunication switching equipment to overvoltages and overcurrents K.21 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Resistibility of subscribers' terminals to overvoltages and overcurrents K.22 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Overvoltage resistibility of equipment connected to an ISDN T/S bus K.23 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Types of induced noise and description of noise voltage parameters for ISDN basic user networks K.24 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Method for measuring radio-frequency induced noise on telecommunications pairs K.25 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Lightning protection of optical fibre cables K.26 (1988) [Blue Book Fasc. IX] [Publ.: Mar.90] Protection of telecommunication lines against harmful effects from electric power and electrified railway lines K.27 (03/91) [New] [1 pp.] [Publ.: Jun.91] Bonding configurations and earthing inside a telecommunication building K.28 (1993) [Rev.1] [11 pp.] [Publ.: Jul.94] Characteristics of semi-conductor arrester assemblies for the protection of telecommunications installations K.29 (01/92) [New] [4 pp.] [Publ.: Apr.92] Coordinated protection schemes for telecommunications cables below ground K.30 (1993) [New] [7 pp.] [Publ.: Jul.94] Positive temperature coefficient (PTc) thermistors K.31 (1993) [New] [7 pp.] [Publ.: Jul.94] Bonding configurations and earthing of telecommunication installations inside a subscriber's building ---------------------------------------------------------------------- Some 1120 Recommendations from the Blue Book are still in force. 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