Lenovo ThinkStation D20 - Manual (Page 12)

Connector Description
USB connector Used to attach a device that requires a Universal Serial Bus (USB) connector,
such as a USB keyboard, a USB mouse, a USB scanner, or a USB printer. If you
have more than 10 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).
Notes:
1. To operate the computer within FCC Class B limits, use a Category 5
Ethernet cable.
2. Your computer has two Ethernet connectors. For optimal performance,
connect your Ethernet cable for the primary LAN to the connector marked as
number “1.”
Serial port Used to attach an external modem, a serial printer, or other devices that use a
9-pin serial port.
Microphone connector Used to attach a microphone to your computer when you want to record sound or
if you use speech-recognition software.
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 to your computer, connect
the cable to the audio line-out connector of the device and the audio line-in
connector of the computer.
Audio line-out connector (front
speaker connector) Used to send audio signals from the computer to external 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 speakers, this connector should be attached
to the front left and right speakers.
Audio line-out connector
(subwoofer/center speaker
connector) When used with 5.1 or 7.1 surround speakers, this connector should be attached
to the center speakers and subwoofer.
Audio line-out connector (rear
speaker connector) When used with 5.1 or 7.1 surround speakers, this connector should be attached
to the rear left and right speakers.
Audio line-out connector (side
speaker connector) When used with 7.1 surround speakers, this connector should be attached to the
side left and right speakers.
Optical SPDIF out connector Used to send 5.1 digital audio signals from a computer to an external device (such
as an amplifier or a receiver) through a TOSLINK (ToshibaLink) optical cable.
Optical SPDIF in connector Used to receive 5.1 digital audio signals from external equipment (such as a
receiver or other multimedia device) through a TOSLINK optical cable.
eSATA connector Use this external Serial Advanced Technology Attachment (eSATA) connector
to attach an external hard disk drive.
IEEE 1394 connector Used to send and receive IEEE 1394 signals between the computer and other
compliant devices, such as a video camera or external storage drive. This
connector is sometimes called Firewire because it transmits data rapidly.
6 ThinkStation Hardware Installation and Replacement Guide