Lenovo 3000 J Series manual Connector, Description

Connector	Description
Mouse connector	Used to attach a mouse, trackball, or other pointing device that
	uses a standard mouse connector.
Keyboard connector	Used to attach a keyboard that uses a standard keyboard
	connector.
Serial connector	Used to attach an external modem, serial printer, or other
	devices that use a 9-pin serial connector.
Parallel connector	Used to attach a parallel printer, parallel scanner, or other
	devices that use a 25-pin parallel connector.
Audio line out connector	Used to send audio signals from the computer to external
	devices, such as powered stereo speakers (speakers with
	built-in amplifiers), headphones, multimedia keyboards, or the
	audio line in connector on a stereo system or other external
	recording device.
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.
Microphone connector	Used to attach a microphone to your computer when you want
	to record voice or other sounds or if you use
	speech-recognition software.
USB connectors	Used to attach a device that requires a Universal Serial Bus
	(USB) connection, such as a USB scanner or USB printer.
	Depending upon the model, if you have more than four or six
	USB devices, you can purchase a USB hub, which you can use
	to connect additional USB devices.
Ethernet connector	Used to attach an Ethernet cable for a local area network
	(LAN).
	Note: To operate the computer within FCC Class B limits, use
	a Category 5 Ethernet cable.

Chapter 3. Installing options 19