18
(For Constant Supervision applications with 4100U Master Firmware Revision 11.08 or
later) Figure 11 is an illustration of Class A and Class B digital wiring from the digital audio
controller to risers connected to TICs or the Network Audio Riser Controller Module.
FigureTag FD4-844-02
OR
4100-1341
MCC DIGI TAL AUDIO
RISER (566-833)
OR
4100-1341
MCC DIGI TAL AUDIO
RISER (566-833)
OR
4100-1341
MCC DIGI TAL AUDIO
RISER (566-833)
Figure 11. Digital Interconnections (4100-1311 Digital Audio Controller)
Continued on next page
Wiring,
Continued Wiring, Continued
Digital
Interconnections
(4100-1311 Digital
Audio Controller
[Constant
Supervision
Applications])
1. All wiring is 24 AWG (0.2047 mm
) to 18 AWG (0.8321 mm
), twisted-pair. Unshielded wiring is preferred. If shielded wiring is used (retrofit or
outside wiring) terminate as indicated in note 4.
2. If the length of the primary cable is greater than 500ft (152m), set jumpers P5 and P6 to position 2-3. If the length of the secondary cable is
greater than 500ft (152m), set jumpers P7 and P8 to position 2-3.
• Maximum wire distance: 2,500 ft (762 m) for unshielded cables or 1000ft (304m) for shielded cables from the digital audio controller
primary to the digital audio riser card.
• 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
3. If the length of the primary cable is less than 500ft, set jumpers P5 and P6 to position 1-2. If the length of the secondary cable is less than 500ft,
set jumpers P7 and P8 to position 1-2.
• Maximum wire distance: 500 ft (152 m) for unshielded cables or 500 ft (152 m) for shielded cables from digital audio controller primary to
the digital audio riser card.
• Maximum line resistance and capacitance between nodes:
• 18 AWG (0.8321 mm
2
): 40 Ohms maximum 0.02 μF maximum
• 24 AWG (0.2047 mm
2
): 135 Ohms maximum 0.02 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. External wiring must be twisted shielded. Connect the
primary cable’s shield to the chassis ground at the DAR Controller and connect the shield of the secondary cable to the chassis ground at the
remote DARIC cabinets.
5. Wiring must be free of all grounds.
6. Maximum number of digital interface cards per digital audio riser: 31.
7. All riser wiring is supervised and power-limited.
8. Audio wiring is not to be mixed in the same jacket with other wiring (including other audio wiring).
9. In applications where no Digital Audio Controller is connected to the field wiring (such as a synchronized audio application or a non-
synchronized application with multiple network microphones), all DAR interface cards are wired secondary to primary.
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