A single and double wire switching arrangement in which each balanced two-wire transmission circuit is transformer coupled with two single-wire network terminations with capacitive DC isolation between the transformer windings and a reference potential connected between the isolating capacitors. Either of two unbalanced single-wire paths or one balanced two-wire path can be established through the network from each transmission circuit. A single-wire path is sufficient for most functions; however, the two-wire path is available for those functions requiring a metallic or a balanced path. Network blocking is low since the majority of network paths are single wire thus freeing unused single-wire links, for other paths. Supervision can be maintained either at a transmission circuit or at a junctor circuit included in the network path.