ANORDNING VID ETT BETALKORT UTNYTTJANDE BETALNINGSSYSTEM INOM TELENAETET

PCT No. PCT/SE83/00311 Sec. 371 Date May 7, 1984 Sec. 102(e) Date May 7, 1984 PCT Filed Sep. 5, 1983 PCT Pub. No. WO84/01073 PCT Pub. Date Mar. 15, 1984.A payment system utilizing a payment card (5) is employed for a telephone set (1) which forms part of the general telephone network and is connected to a telephone central office (2) via a subscriber's line (3). The telephone set and the telephone central office are provided with first devices which exchange first signals via the subscriber's line. The first devices include first subsidiary devices for identification of the payment card (5) concerned, second subsidiary devices for sensing of the residual value (5a) on the card, and third subsidiary devices for erasure and possible indication of the residual value on the card after this has been used for calls subject to a charge. The payment system also serves an installation separate from the telephone system, which can comprise an automatic parking installation. The letter includes a parking meter (14) and this and the telephone central office are provided with second devices which exchange second signals via the subscriber's line (3). Essentially the second devices correspond, as regards their function, to the first devices. The telephone call and communication signals together with the first and second signals are separated by means of filter devices (11, 11', 13, 13', 16, 16') which are or can be connected to the subscriber's line.