Black Box Quad Audio Balun User manual

Specifications
Environment Unbalanced line-level analog audio.
Devices DVD players, audio receivers, audio amplifiers and audio
mixers, audio matrix switchers and other unbalanced line-level
audio equipment.
Transmission Transparent to the user.
Bandwidth (3dB
roll-off point)
(400 O source & 50
kO receiver)
Up to 1,000 ft (305m): 60Hz -20 kHz
1,000 ft (305m) to 5,000 ft (1.5 km): 100Hz -20 kHz
Maximum Input
Level 1.1Vp-p (+20 dBu, unbalanced < 1% THD)
Insertion Loss per
Balun Pair Less than 1 dB per pair over the frequency range
Common Mode
Rejection (CMMR) Greater than 60 dB @ 1 kHz
Audio Source
Impedance 100 to 600 O
Audio Receiver
Impedance 10 kO to 100 kO
Impedance
Transformation
Ratio
Single unit: 4:1 (source:line)
Cable –UTP
24 gauge or lower solid copper twisted pair wire impedance:
100 ohms at 1 MHz. Maximum capacitance: 20 pf/foot.
Attenuation: 6.6 dB/1000 ft at 1 MHz
Cable -Coax 75-ohm coaxial cable
Connectors Four (4) RCA-receptacle for audio. One (1) RJ45 jack
Pin Configuration Audio 1: Pins 7 (R) & 8 (T) Audio 2. Pins 3 (R) & 6
(T)
Audio 3: Pins 4 (R) & 5 (T) Audio 4: Pins 1 (R) & 2
(T)
Impedance Video: 75 ohms (RCA) unbalanced.
Temperature Operating: 0 to 55 C. Storage:-20 to 85 C. Humidity: up to
95%
Enclosure Fire retardant plastic
Dimensions 2.40” x 2.25” x 1.00” (6.1 x 5.7 x 2.54 cm)
Warranty Lifetime
Order Information IC565A Quad Audio Balun
94-000386-ASE-000417-A
Quad Audio Balun (IC565A)
Installation Guide
Introduction
The Quad Audio Balun allows up to four (4) analog line audio signals to be transmitted
via unshielded twisted pair (UTP) cable in a point-to-point connection. Used in pairs,
the Quad Audio Balun eliminates up to four (4) coaxial cables, allowing audio-video
equipment to be connected via space-efficient and cost-effective Category 5 twisted pair
cable. The Quad Audio Balun also works in conjunction with other Black Boxanalog
audio baluns such as the IC460A.
Installation
One (1) pair of baluns support four (4) mono unbalanced analog audio channels or two (2)
stereo audio channels via Cat5 twisted pair. To install the baluns, perform the following
steps:
1. Identify the pin configuration of the baluns. Four (4) twisted pairs are required
if all four (4) signals are transmitted. The pin configuration follows the
EIA/TIA 568A/B standard. The Quad Audio Balun is reverse polarity
sensitive. Please ensure that wiring is straight-through (Ring to Ring, Tip to
Tip).
2. At the audio source end, connect a Quad Audio Balun to the audio output using
the appropriate number of RCA cables.
3. At the audio receiver end, connect a Quad Audio Balun to the audio input using
the appropriate number of RCA cables.
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4. Complete the connection between the two baluns, using standard Cat5 twisted
pair cable and connecting hardware, terminated on RJ45 plugs at both ends.
Ensure that there are no split pairs or taps.
5. Power-on the audio equipment. Check the sound quality and refer to the
troubleshooting table below if the sound quality is unsatisfactory. The
following diagram shows a typical installation.
Troubleshooting
The following tables describe some of the symptoms, probable causes and possible
solutions in respect to the installation of the Quad Audio Balun. If you still cannot
diagnose the problem, please call Black Box Tech Support at 724-746-5500.
Symptom Probable Causes Possible Solutions
Poor audio quality 1.EMI interference. Check that wiring is not too close to
transformers and ballasts.
2.Split pair Check if the UTP pairs are split and
correct. Each signal pair must be
twisted.
No audio 1.Power-off. Check power supply.
2.Open contact Check wiring to ensure continuity
3.Defective Audio Balun Change Audio Baluns for another
pair.
Audio weak 1.Exceeded distance
specifications Check DC loop resistance and verify if distance spec is exceeded. Reduce
cable length or eliminate high-loss
components.
2.Lower grade UTP cable
is introducing high
signal losses.
Use signal repeater for extended
distance.
Replace cable by higher grade.
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