A system and method for providing redundant source synchronous communication links. Problems involved are solved by a curing composition characterized by including an organic polymer having one or more silicon-containing groups capable of cross linking by forming siloxane bonds, a metal carboxylate andor carboxylic acid, and a silicon compound having a hetero atom on the carbon atom in the \u03b1 or \u03b2 position with respect to the silicon atom. A conductive member is provided to be electrically in contact with a conductive layer formed of a long-sized substrate.