Sony PCV-RX540 - Vaio Desktop Computer System Reference Manual page 24

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VAIO Digital Studio System Reference Manual
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.
Headphones
Connector
Headphones
Mic
Line In
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.
Your computer has only one RJ-11 female phone jack if you have a
HomePNA modem installed. The modem installed on your computer
may differ depending on the configuration you purchased.
Line
✍
Accidentally plugging a phone line from the wall into the modem's telephone jack, and a
telephone into the line jack, does not damage the modem card or telephone equipment.
However, the modem will not work correctly.
Line In
Description
1.0 Vrms (typical).
Electret condenser microphone input.
1.0 Vrms (typical), 10 Kohm impedance.
Phone
Mic