Stewart Data Sockets A range of PCB mounting data sockets commonly used in networking and communication applications. Sockets conform to the FCC68 specification and are compatible with data plugs. Designation of socket type is identified by the number of contact positions followed by the number of contacts, Includes keyed and shielded versions. All sockets are Category 4 apart from those specified as Category 5 (Cat 5). All models are highly reliable and excellent quality.