HN440 USER’S GUIDE
I n s t a l l a t i o n 2 7
Pin
Description
1
Signal ground
2
+12 V DC fan drive voltage
3
Tachometric signal from fan
The tachometric signals are useful only on HN440 builds with
the Heceta II device.
CD audio, line-in and telephony connectors (items 15, 16
and 17 on page 10), for motherboard builds with Audio. The
CD audio connector allows the sound from music CDs played
in a CD-ROM drive to be mixed into the computer’s audio
system. The line-in and telephony connectors are respectively
intended for multimedia expansion cards and so-called
“speech modem” expansion cards with voice mail capability.
CD Audio and Line-in
Pin
Description
1
Left audio input
2
Signal ground
3
Signal ground
4
Right audio input
Telephony
Pin
Description
1
Input from modem
2
Signal ground
3
Signal ground
4
Microphone output to modem
Wake-on-LAN connector (item 12 on page 10) for network
cards that support Wake-on-LAN technology. The
Wake On
LAN
option in BIOS Setup must be enabled, and requires the
use of a logic-controlled Power Supply Unit (PSU) with at
least 720 mA +5 V standby power.
Chassis intrusion switch connector (item 19 on page 10) for
motherboard builds with the Heceta II System Monitor.
Allows the connection of a signal cable from a microswitch
that can sense when the chassis is open or closed. The design