Answer:
RJ-11 connector.
Step-by-step explanation:
RJ-11 (Registered Jack-11) also known as the phone line or modem port is a network cable having twisted wire pairs and a modular jack with two, four or six contacts. It is generally used with telephones and modem.
Hence, the other connector type that can be used with CAT 3 installations is the RJ-11 connector.