Lenovo ThinkCentre M55 (English) User guide - Page 34
Obtaining, device, drivers - ethernet driver
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Connector Description USB connectors Used to attach a device that requires a Universal Serial Bus (USB) connection, such as a USB mouse, USB keyboard, USB scanner, or USB printer. If you have more than eight USB devices, you can purchase a USB hub, which you can use to connect additional USB devices. Parallel connector Used to attach a parallel printer, parallel scanner, or other devices that use a 25-pin parallel connector. Serial connector Used to attach an external modem, serial printer, or other devices that use a 9-pin serial connector. 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. Obtaining device drivers You can obtain device drivers for operating systems that are not preinstalled at http://www.lenovo.com/support/ on the World Wide Web. Installation instructions are provided in README files with the device driver files. 18 User Guide