Plugged control card for telecommunication switching system - is of simple and pre-wired construction and engages with female contacts

摘要

The control card is of the type which has a rectangular electrically conducting base whose two longest sides have slides on them. One of the short sides has an insulating piece (4) on it. This insulating piece has on its front face pins (6) which are connected to connecting wires on the rear face of the piece. An insulating plaque (8) being fitted onto the card base. The base has a frontal part designed to be plugged into female contacts of the connector. Each of the pins (6) press against the shoulder of one of the contacts. Each of the connection wires (9) is connected in series with a resistance (R) and one of the terminals of a lamp (L) mounted on the insulating plaque. The other terminal of the lamp (L) is connected to a voltage source (U) whose other terminal is connected to the metal base.