Extension arrangement and station connecting method for a ring communication system.

摘要

A ring communication system comprises distribution panels (13) for inserting extension lines (15) and attached stations (19) into the communication ring (11); insertion is requested and controlled by DC signaling from the station via a phantom path. To allow attachment of several stations via additional extension lines (25) to a single basic extension line (15), extension distribution panels (23) are provided comprising line insertion modules (31) like the basic distribution panels. Insertion of a station and its additional extension line (25) up to the EXP is still controlled by DC signaling from the station, but insertion of the basic extension line(15) is controlled by a tone signal transferred from the EXP to the basic distribution panel via a phantom path. The EXP (23) needs no own power supply because DC power is provided from the basic distribution panel (13) via the phantom circuit of the basic extension line.