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Installing options 69
USB cables and hubs: You need a 4-pin cable to connect devices to USB 2 or USB 3. If
you plan to attach more than two USB devices, you must use a hub to connect the
devices. The hub provides multiple connectors for attaching additional external USB
devices.
USB technology transfers data at up to 12 megabits-per-second (Mbps) with a
maximum of 127 external devices and a maximum signal distance of five meters (16
ft) per segment.
USB connectors: There are two USB connectors located on the rear of the server for
attaching USB-compatible devices, see “I/O connector locations” on page 60 for the
location of the USB connectors. The table below shows the pin-number assignments
for the USB connectors.
Audio connectors
The audio connectors are used to connect external audio equipment to your server,
see “I/O connector locations” on page 60 for the location of these connectors.
Line out: This connector is used to send audio signals from the server to external
devices, such as powered speakers with built-in amplifiers, headphones, multimedia
keyboards, or the audio Line in connector on a stereo system.
Line in: This connector is used to accept audio signals from external devices, such as
line output from a stereo, television, or musical instrument into the server sound
system.
Mic: This connector is used to connect a microphone to your server when you want
to record voice or other sounds on the hard disk drive. It might also be used by speech
recognition software.
MIDI connector
The musical instrument digital interface (MIDI) connector allows your server to
interact with musical instruments and other musical equipment. You might use the
MIDI connector as an interface between your server and a synthesizer to edit and
store sound information for the synthesizer on the server. See “I/O connector
Table 12. USB connector pin-number assignments.
Pin Signal
1+5 V
2-Data
3+Data
4Ground
14
Line
out
Line
in
Mic