Avlink VAX-2088 - Manual (Page 11)

VAX Matrix Switching System—User Manual
10
Pin No. Name Description
1 RED Red video signal
2 GREEN Green video signal
3 BLUE Blue video signal
4 n.c. No connect
5 GND Ground
6 RED_RTN Red video signal return
7 GREEN_RTN Green video signal return
8 BLUE_RTN Blue video signal return
9 n.c. No connect
10 GND Ground
11 n.c. No connect
12 SDA I2C data
13 HSYNC
Horizontal synchronization
signal
14 VSYNC Vertical synchronization signal
15 SCL I2C clock
Figure 5-2 VGA Connecting Cable
5.0.1.2 Audio Connecting Cable
Compared to the video connecting cable, the audio connecting cable has two different ways
of connection: the balanced and the unbalanced connection.
The “Audio Inputs” and “Audio Outputs” connectors of the VAX matrix are for connection
to the video players audio signal and multiplexers.
Balanced connection is a connection method of using two signal wires to transmit a pair of
balanced signals. Since interference to two signal wires are similar and out of phase the
interfering signals are cancelled out.The lower audio frequencies are susceptible to interference
in long distrance transmission. Therefore, balanced connection is a way to counter interference
commonly used in professional audio equipment. In household appliances, two-wire cable with
sleeve is sometimes used. However, they are used for the left and right audio signal channels and
do not belong to balanced connection.
Unbalanced connection uses only one signal cable for connection and is susceptible to
interference. Most household appliances and not-so-demanding audio equipment uses
unbalanced connection.
A specific connection of the audio signal cable is given below:
1. Unbalanced connection: The “G” leg connects to the Sleeve, and the “+” leg
connects to the red wire (TIP) while the “-“ leg connects to the “G” leg.