Registered jack connector 45. Connector used for computer networks using UTP or STP cables (4 pairs - 8 strands). The connection of particular wires should meet the official standards (e.g. EIA/TIA T568B or T568A or European ISO/IEC 11801). There exist various versions for particular types of cables: 1. for shielded and unshielded cables, 2. solid and stranded wires.