External Cables; Audio Card And Connector; Table C-12 Audio Card Features - Sun Microsystems Ultra 80 Service Manual

C.1.11.2

External Cables

The RJ-45 Ethernet port supports a Category 5, UTP cable for the 100BASE-T, and a
Category 3, 4, or 5 UTP cable for the 10BASE-T operation.
Note – The maximum cable segment lengths for the 100BASE-TX and
10BASE-TX are 109 yards (100 meters) and 1094 yards (1000 meters), respectively.
C.1.12

Audio Card and Connector

The audio card provides various audio applications from telephone-quality speech
to CD-quality music. The audio card supports four jacks of identical type: line in,
line out, headphone out, and microphone in. The following table lists the major
features of the audio card and the following figure illustrates a functional block
diagram.
TABLE C-12
Figure
Reference
1
2
3
4
Audio Card Features
Feature
Stereo line level
Stereo microphone input
Internal CD-ROM
peripheral analog outputs
Codex mono-output
Description
Attenuated by a resistor divider network and
then fed into the Line Inputs of the Codec.
Buffered by a non-inverting operational
amplifier (one operational amplifier for the left
channel and one operational amplifier for the
right channel). The left and right outputs are
then fed into the left and right Mic Inputs of
the Codec. A filtered +5 VDC is fed to the
signal inputs.
Cabled to the motherboard and AC-coupled to
the left and right Aux1 inputs of the Codec.
Fed into an active graphic equalizer to add bass
boost and mid-range attenuation. Equalizer
output is amplified and routed to the front
mounted 16-ohm, 68-mm speaker.
Appendix -27