20
A distributed line level signal is used between audio nodes in a Multiple Digital Command Centre
(MCC) network system where nodes have local analog audio but need to be able to play the
microphone, the tones, and the messages from a separate node’s Digital Audio Controller.
For this MCC application, the 4100-1341 Digital Riser Interface (566-833) has a single digital to
analog converter that can be set to convert any single channel of the Digital Audio Riser (DAR)
stream to line level analog. This analog output is connected to an Analog Audio Controller’s input
option cards (4100-1240, 566-037) line level input. DIP switches configure the channel selection
and density.
Figure 13 is an illustration of this MCC application wiring. Refer to the Switches and Indicators
section for switch settings to configure the MCC DARICs channel output.
4100U ANALOG AUDIO NETWORK NODE DETAIL
NETWORK AUDIO
RISER CONTROLLER
MODULE
4100-1341
MCC DIGITAL AUDIO
RISER INTERFACE
(566-833)
4100-1210
ANALOG AUDIO
CONTROLLER
(566-218)
SHIELDED CABLE
MCC ANALOG OUTPUT
SEE NOTE 7
AMPLIFIER
(OPTIONAL)
PDI
PDI
4100-1240
INPUT OPTION CARD
(566-037)
1400U PC U
014D 0iatiguA loid
oCortn0014 rell31-11
eNowtrk
CIT
&
D AIR C
4-0012602
14N 02ewtkroon edtiwh
4U001 D itigaA l udiV o CC
0140 UPC U
14D 00itigaA luoid
Co rtnoell14 r1-00 113
1420N ewtrok on edw ith
014 0U Digi duA latiCV o C
Backup
ECS command center #2
ECS command center #1
eNowtrk
CIT
&
D AIR C
4-0012602
DAR
This connection is for
Class A Operation
Figure 13. Multiple Digital Command Center (4100U FACP shown)
Wiring,
Continued
Notes:
1. All wiring is 24 AWG (0.2047 mm
2
) to 18 AWG (0.8321 mm
2
), twisted pair.
2. Maximum distance between subsequent nodes: 2,500 feet (762 meters).
3. Maximum line resistance and capacitance between nodes:
18 AWG (0.8321 mm
2
): 40 Ohms maximum,
0.055 μF maximum
24 AWG (0.2047 mm
2
): 135 Ohms maximum,
0.055 μF maximum
4. All wiring that leaves the building requires the 2081-9044 Overvoltage Protector at each entry or exit to the building. A maximum of four
overvoltage protectors are allowed. Each 2081-9044 adds 6 Ohms and 0.006 μF.
5. Wiring must be free of all grounds.
6. Audio wiring is not to be mixed in the same jacket with other wiring (including other audio wiring).
7. When using the Option Card for a MCC, you must configure the card for a line level input. See the Option Card manual (579-160) for details.
8. Typically, the Master Microphone is located in Node 1 but could be in a different node depending on the application.
Multiple Digital
Command Center
Interconnections
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