4-26
Chapter 4 Networking
Network Audio Wiring (continued)
Distributed
Microphone
Interconnections
A Distributed Microphone is used between audio nodes in a network system where each node
has its own local audio (its own Digital Audio Controller) but needs to be able to play the
microphone channel from a separate node’s Digital Audio Controller.
For a distributed microphone application, the 4100-0622 Digital Riser Interface
(566-407, -1000) has a single digital to analog converter that can be set to convert any single
channel of the Digital Audio Riser (DAR) stream to analog. This analog output is connected to
a second Digital Audio Controller’s remote microphone input or to the microphone input of a
4100-1240 Input Option Card (566-037). DIP switches configure the channel selection and
density.
Figure 4-21 is an illustration of the distributed microphone application wiring. Refer to the
Switches and Indicators section for switch settings to configure the distributed microphone
channel output.
Reference for
MCC DARIC
Installation
For information of the installation of Multiple Digital Command Centre (MCC) Digital Audio
Riser Input Option Cards (DARICs) refer to the latest revision of document 574-844.
Figure Notes:
1. Leave the 4.7 K, ½ W
resistors (378-056;
yellow/violet/red) on the
“+” to “-” terminals of
unused contacts.
2. All wiring is 18 AWG to 14
AWG, twisted-shielded
pair.
3. Audio wiring is not to be
mixed in the same jacket
with other wiring
(including other audio
wiring).
4. AC voltage rating: 10
VRMS (maximum)
5. DC voltage rating: 1 VDC
(maximum)
6. Maximum number of
analog interface cards per
audio riser: 31.
7. All wiring that leaves the
building requires the
2081-9044 Overvoltage
Protector at each entry or
exit to the building.
8. Maximum wire distance:
10,000 feet (3,048
meters).
9. Wiring must be free of all
grounds.
10. Set audio input card
jumpers as shown in Aux
Audio Input Module
Installation Instructions
579-160.
11. All riser wiring is
supervised and
power-limited.
Figure 4-21. Distributed Microphone Interconnections
(566-409, -1028)
(566-407, -1000)
(566-409, -1028)
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