Issue link: https://resources.mouser.com/i/1442796
| 29 | To name just two: K.12: "Characteristics of gas discharge tubes for the protection of telecommunications installations" K.99: "Surge protective component application guide - Gas discharge tubes" These recommendations describe the test for characterization and application of Gas Discharge Tubes (GDTs). GDTs are often used for primary protection of telecom applications due to their robustness and low capacitance. Additional details on characteristics (waveshapes and peak values) of expected surges due to lightning on telecommunication lines of the access network and on signaling lines at the customer premises using metallic conductors are given in: K.67: "Expected surges on telecommunications and signaling networks due to lightning" The ITU-T K.67 and K.98 recommendations can be used as a guide on how to protect telecommunication equipment from overvoltage damage due to lightning strikes to the power and telecommunication lines/cables. K.98: "Overvoltage protection guide for telecommunication equipment installed in customer premises" Further recommendations that offer application guides on protection components are: K.102: "Parameters of fixed-voltage thyristor overvoltage protector components used for the protection of telecommunication installations" K.103: "Surge protective component application guide - Silicon PN junction components" In addition to components used for protection, there are recommendations to assist with ITU-T compliance in other areas of the equipment design. For instance, components tested to fulfill certain functionality, and thus to protect equipment. The ITU-T recommendation has tests for Ethernet ports that can be especially sensitive and require added protection: K.117: "Primary protector parameters for the surge protection of equipment Ethernet ports" K.118: "Requirements for lightning protection of fiber to the distribution point equipment" Safety recommendations are also included: K.50: "Safe limits for operating voltages and currents of telecommunication systems powered over the network" The ITU-T K.50 Recommendation provides guidance on voltages and currents that may safely be used to power telecommunication systems that are part of the telecommunications service providers' network. K.51: "Safety criteria for telecommunication equipment" The ITU-T K.51 Recommendation supplies guidance on safety criteria for telecommunication network infrastructure equipment. ITU-T K.51 Recommendation specifies requirements intended to reduce risks of fire, electric shock or injury for specified classes of persons who may come into contact with the equipment. These recommendations refer to the IEC safety standards IEC 60950-1 and IEC 62368-1 and provide additional requirements when these are not covered by the IEC standards.