The RJ45 connector is used for network cabling and is suitable for Ethernet connections, including Gigabit Ethernet. The RJ45 connector is utilized with twisted pair cabling, such as Cat 5e or Cat 6, which are capable of supporting Gigabit Ethernet speeds. Other connectors listed either have different purposes (such as the RJ11, which is used in telephony) or are not actual cable connectors (such as Plenum, which refers to a type of cable used in spaces with air circulation for heating and air conditioning systems).