2 audio, For this catvision-cpu has, Line in – Guntermann & Drunck CATVision Benutzerhandbuch
Seite 133: Line out, Catvision-con has the following connections, Micro in, Speaker, The connecting is designed as 3.5 mm jack

Guntermann & Drunck GmbH
Operating Instructions
CATVision (MC)
8.2
Audio
CATVision offers a bidirectional Stereo-Audio transmission nearly in CD
quality.
For this CATVision-CPU has
-
Line In
-
Line Out.
Keyb PS/2.
Mouse PS/2
Monitor
CPU In
Main Power
Line In Line Out
RS 232
CPU
Keyb. Mouse In
VGA
5V DC/5A
Red. Power
AC 100-240 V, 47-63 Hz
Trans
USB K/M
CPU In
USB 1.1
Transmission
page 59
CATVision-CON has the following connections:
-
Line In
-
Micro In
-
Speaker
Line In Micro In
RS 232
Speaker
Keyb.
Mouse
PS/2
5V DC/5A
Main Power
AC 100-240 V, 47-63 Hz
Monitor
Transmission Red. Power
Service
USB Trans
Keyb.
Mouse
USB
The output is for sending the corresponding audio signals which come in at the
other end of the transmitting distance.
The transmission of the audio signals is digital via CAT-x cable and so
independent from the length of the cable.
Digitalisation is done with a resolution of 18 Bit and a scan rate of 48 kHz.
The connecting is designed as 3.5 mm jack.
The inputs Micro In and Line In of the corresponding devices can not be used
at the same time.
The input Micro In has a preamplification of 20 dB.
Here the connections used most often:
PC CAT
Vision-CPU
CAT
Vision-CON
Periphery
1. Line-Out =>
Line-In
Line-Out
<= active speaker
2. Line-In =>
Line-Out
Micro-In
<= microphone