Multiple choice general knowledge science & technology What type of connector is used to plug a telephone line into a modem? COM1 RJ-45 RJ-11 RJ-10 Reveal answer Fill a bubble to check yourself C Correct answer Explanation RJ-11 is the standard connector used for telephone lines. It has 4-6 pins and is the small plastic plug found in phone jacks. RJ-45 is larger and used for Ethernet networks, while COM1 is a serial port designation, not a physical connector type.