Lenovo THINKCENTRE 9120, Replacement Manual, Page: 15 / 62

Connector Description
Standard mouse connector Used to attach a mouse, trackball, or other pointing device that
uses a standard mouse connector.
Standard 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.
USB connectors Used to attach a device that requires a Universal Serial Bus
(USB) connection, such as a USB keyboard, USB mouse, USB
scanner or USB printer. If you have more than 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.
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.
Chapter 2. Overview
7