Code of practice for installation of apparatus intended for connection to certain telecommunication systems, Installation of switching apparatus that may be connected to certain analogue telecommunication systems— 12 стр.
33.040.30 Switching. Including telecommunication call charging and billing aspects / Системы коммутации и сигнализации. Включая аспекты начисления платы и выписки счета за вызов по телекоммуникациям
33.020 Telecommunications. Including infrastructure / Телекоммуникации в целом. Включая инфраструктуру
