Postal services [documento electrónico] : address databases: part 1: components of postal addresses: EN 14142-1: February 2003 / European Committee for Standardization
EN 14508 [documento electrónico] : postal services: quality of service: measurement of the transit time of end-to-end services for single piece non-priority mail and second class mail / European Committee for Standardization
EN 50065 -1 : July 1991: signalling on low-voltage electrical installations in the frequency range 3khz to 148,5 khz: part 1: general requirements, frequency bands and electromagnetic disturbances / European Committee for Electrotechnical Standardization
EN 50065 -2-1 : January 2003: signalling on low-voltage electrical installations in the frequency range 3khz to 148,5 khz: part 2-1: immunity requirements, for mains communications equipment and systems operating in the range of frequencies 95 kHz to 148,5 kHz and intended for use in residential, commercial and light industrial environments / European Committee for Electrotechnical Standardization