IBM ThinkPad 755CX Operation User's Manual page 92

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Microphone/Line-in
Jack
Modem/Fax Port
Headphone
Jack
Microphone/Line-in
Jack
Headphone
Jack
Modem/Fax Port
Headset
Note:
The headset is available as an option
in some countries.
When the DAA /Telephony Option Kit is installed:
Microphone/Line-in
Jack
Modem/Fax Port
Headphone
Jack Data Access
Arrangement