Sony PCV-RX740 - Manuel (Page 26)

VAIO Computer System Reference Manual 12
Mic, Line In, and Headphones Jacks
The microphone, line in, and headphones jacks are physically identical,
but have different connections. They are standard 3.5 mm stereo mini-
jacks.
Telephone and Line Jacks
The telephone and line jacks are physically identical and have identical
connections. They are standard RJ-11 female phone jacks. However, the
line jack is for connecting to a telephone line that comes from the wall,
and the telephone jack is for connecting the computer to a telephone.
The modem installed on your computer may differ depending on the
configuration you purchased.
Connector Description
Headphones 1.0 Vrms (typical).
Mic Electret condenser microphone input.
Line In 1.0 Vrms (typical), 10 Kohm impedance.
Headphones Line In Mic
Line Telephone