Lenovo 4269, 4271, 4272, 4265, 4264, 4266, 4263 manual Connector Description

Connector	Description
Audio line-in connector	Used to receive audio signals from an external audio device,
	such as a stereo system. When you attach an external audio
	device, a cable is connected between the audio line-out
	connector of the device and the audio line-in connector of the
	computer.
Audio line-out connector	Used to send audio signals from the computer to external
(front speaker connector)	devices, such as powered stereo speakers (speakers with built-in
	amplifiers), multimedia keyboards, or the audio line-in
	connector on a stereo system or other external recording
	devices.
	When used with 5.1 or 7.1 surround-sound speakers, this
	connector should be attached to the front left and right
	speakers.
Audio line-out connector	When used with 5.1 or 7.1 surround-sound speakers, this
(rear speaker connector)	connector should be attached to the rear left and right speakers.
Audio line-out connector	When used with 7.1 surround-sound speakers, this connector
(side speaker connector)	should be attached to the side left and right speakers.
Audio line-out connector	When used with 5.1 or 7.1 surround-sound speakers, this
(subwoofer/center speaker	connector should be attached to the center speaker or
connector)	subwoofer.
eSATA connector	Use this connector to attach an external hard disk drive.
Ethernet connector	Used to attach an Ethernet cable for a local area network
	(LAN).
	Notes:
	1. To operate the computer within FCC Class B limits, use a
	Category 5 Ethernet cable.
	2. If your computer has two Ethernet connectors, it is
	recommended that you connect your primary Ethernet cable
	to the Ethernet connector marked as number ″1″ for optimal
	performance.
IEEE 1394 connector	Used to send and receive IEEE 1394 signals between the
(available on some	computer and a compliant device, such as a video camera or
models)	external storage drive. This connector is sometimes called
	FireWire because it transmits data rapidly.
Microphone connector	Used to attach a microphone to your computer when you want
	to record sound or if you use speech-recognition software.

8User Guide