Instruction manual

Page 22
UTY4422-001 Page 22 of 74
Table 12. Analog Audio Channel 1 and Channel 2 Connector Pinouts
Channel 1, J5, DB9 Channel 2, J6, DB9
Pin # Signal Pin # Signal
1 AUDIO1R+ 1 AUDIO2R+
2 GNDD 2 GNDD
3 AUDIO1R- 3 AUDIO2R-
4 AUDIO1L+ 4 AUDIO2L+
5 GNDD 5 GNDD
6 AUDIO1L- 6 AUDIO2L-
7NC 7 NC
8NC 8 NC
9NC 9 NC
2.5.1 Balanced Audio Outputs
There are two audio channel outputs on the rear panel. Each Channel (Ch1 & Ch2) has a right
and left pair. Each of these pairs is a balanced, low-impedance audio output. These are accessed
through DB-9 connectors, which plug through the rear panel into the main PWB.
Please note that audio should be terminated with 600-ohm loads for correct output levels.
2.5.2 FCC-Mandated Suppression of Radiated Emissions
In order to comply with the requirements of FCC Part 15 Subpart B, Class A
emissions, please read the following instructions on the protection of all output
wiring and cabling:
For each alarm or user-controlled relay output THAT IS USED, a single ferrite
core must be used for EMI emission suppression. The ferrite cores are supplied
in the shipping container along with the Unity4422 IRD. Details on assembly of
the ferrite cores on the wiring are shown in Figure 2. Note that each pair of wires
must pass through the core twice. Be sure that this is done as close to the
removable screw-terminal strip as possible. If minimal slack is used in the outer
“turn,” the ferrite core should be properly restrained by the wiring alone.
In addition to the above precautions for the wiring to the screw-terminal strips,
the user is cautioned to only use high-quality shielded cabling for the SERIAL 1
and SERIAL 2 connectors.
2.5.3 Alarm Relay and Addressable Contact Closures
The rear panel has an alarm relay and two solid-state contact closures addressable from the
COMPEL™ uplink computer. This relay’s “alarm” conditions are the same as the front-panel
ALARM LED. The alarm relay is factory-set so that an alarm condition or the loss of unit power