| 摘要 |
PCT No. PCT/SE82/00229 Sec. 371 Date Mar. 2, 1983 Sec. 102(e) Date Mar. 2, 1983 PCT Filed Jun. 28, 1982 PCT Pub. No. WO83/00238 PCT Pub. Date Jan. 20, 1983.The invention relates to a method and arrangement in a telecommunications system for obtaining, in transmitting information between terminals commonly connected by a ring bus, an adaption at the interface between the bus and respective terminal, where the terminals may assume different logical conditions. The intention with the arrangement in accordance with the invention is that a breakdown in any of the connected terminals may never cause a breakdown of the ring bus. Such breakdowns may, for example, depend on lack of power or that the terminal assumes a "passive" condition, i.e. does not desire to send. The arrangement includes a connecting unit (CU) at each interface of a terminal and the bus. The unit comprises: A regenerative differential amplifier (F1) containing an amplifier, a clock pulse unit (CL) and a regenerator; switching logic (G1, G2) and an output circuit. Transceive logic (A) in the terminal coacts with the connecting unit such that it supplies control signals to the switching logic of the connecting unit. The connecting unit functions as a switch between terminal and bus, such that when the terminal assumes the PASSIVE condition, or is without power, the signals from the bus (RB) pass through the connecting unit and bypass the terminal. When the terminal desires to transmit and assumes the ACTIVE condition, it sends inhibiting signals (I) to the switching logic (G1, G2) in the connecting unit, whereon the signal path is broken through the latter, the signals flowing through the terminal instead. |
