MuxLab VideoEase MonoPro XLR Guida utente
VideoEase MonoPro XLR Application Guide
© MuxLab Inc. 2005-2006 1
VideoEase MonoPro™ XLR
Application Guide
Version 1.01
Jan 2006
VideoEase MonoPro XLR Application Guide
© MuxLab Inc. 2005-2006 2
Purpose
The purpose of this document is to explain how to apply MuxLab’s MonoPro XLR in different
operating scenarios and to discuss issues not covered in the Installation Guide that comes with
the product.
Function of the MonoPro XLR
The function of the MonoPro XLR is to provide a cost-efficient and user-friendly method of
connecting pro-audio equipment via Cat5 twisted pair cable in a point-to-point connection.
Traditionally, pro-audio users have avoided the use of Category 5 cable because of concern
about the integrity of the connections. The MonoPro XLR has been designed to alleviate these
concerns by providing a secure and reliable connection point for Cat5 cable.
Equipment Supported
Used in pairs, the MonoPro XLR works with any professional audio-video equipment that
supports AES balanced analog or digital audio. The list includes equipment such as the
following:
Audio Amplifiers
Audio Mixing Consoles
Mixer-Amplifiers
Passive microphones
Active microphones
Microphone Pre-amplifiers
Amplified speakers
Digital Audio Rate Converters
Analog/Digital Audio Converters
Digital Audio Recorders (DAT)
CD and DVD players
Equalizers
Signal processors
VideoEase MonoPro XLR Application Guide
© MuxLab Inc. 2005-2006 3
Typical Applications
The MonoPro XLR may be used to establish a variety of point-to-point connections via Cat5
twisted pair. The following diagrams illustrate several configurations that have been tested in
MuxLab’s laboratory.
Mixer to Active Speaker
The following setup tested the balun in stereo analog audio mode. Qualitatively, the sound
characteristics were excellent up to 5,000 ft. Over 5,250 ft, the sound started to have
noticeable high frequency attenuation.
Audio Distribution
The following setup tested the compatibility of the balun with MuxLab’s Audio-Video Hub
(500200) in professional digital audio mode. Qualitatively, the sound quality was clear up to
1,000 ft.
Microphone (MIC input, no phantom) to Mixer
The following setup tested the balun in mono analog audio mode for use with a microphone.
Qualitatively, the sound was good up to 3,000 ft. Above 3,000 ft, the sound quality was
reduced significantly.
VideoEase MonoPro XLR Application Guide
© MuxLab Inc. 2005-2006 4
Digital Audio to Mixer via Rate Converter and D/A
The following setup tested the balun in professional digital audio mode. Note that part of the
UTP cable was winded around a running 60 Hz AC motor to simulate an AC noise source
superposed on the signal. Quantitatively, the maximum distance varied according to the
sampling rate of the rate converter.
Terminating the Cat5 Cable Inside the MonoPro XLR
The following photos show a close-up of the internal wiring connection of the MonoPro XLR.
When is the Ground Terminal Needed
Since the audio signal is transmitted as a balanced signal via twisted pair, the ground terminal is
normally not needed. However, if the MonoPro XLR is used in an application that requires
48VDC phantom power (48VDC), then the ground terminal is needed since phantom power is
transmitted with reference to ground. In regard to safety, this is not an issue since phantom
power is well protected against erroneous connections.
VideoEase MonoPro XLR Application Guide
© MuxLab Inc. 2005-2006 5
Adding a Cat5 line cord to the balun
In applications where the MonoPro XLR must be connected to a modular RJ45 wall outlet, a
line cord may be added for increased versatility. In order to conform to structured cabling
standards, it is recommended to terminate the twisted pair according to TIA 568 standard as
shown in the diagram below and to use stranded Cat5 UTP and a stranded RJ45 plug.
The following photo shows the MonoPro XLR that has been prepared with an RJ45 line cord.
VideoEase MonoPro XLR Application Guide
© MuxLab Inc. 2005-2006 6
Use In Conjunction With Analog Audio Balun (500019)
The MonoPro XLR also works in conjunction with the 500025 at the source and the 500019 at
the receiver. For example, in a building paging system, there may be a central audio distribution
amplifier with pro-audio balanced (XLR)outputsthatneeds to connect to remote audio
amplifiers with line-level (RCA) inputs in another location via Cat5 cable.
However, it is important to note that the nominal professional audio signal is +4dBu and that
unbalanced line level audio is typically -10dBu. For example, if one connects the 500025 to the
500019 via 10 feet of Cat5, the signal level will be too high.
The risks are:
a)the signal may be distorted (s/n ratio)
b)there will be poor frequency response or
c)there may be possible damage to the receiver.
In order to ensure reliable operation, the following precautions should be taken:
a) Ensure straight-through polarity between the 500025 and 500019.
b) Ensure that the signal level at the XLR output is not too high and corresponds to -10dBu at
the receiver either by calculating the signal loss due to the cable and/or adjusting the volume
controls.
VideoEase MonoPro XLR Application Guide
© MuxLab Inc. 2005-2006 7
Using Spare Twisted Pairs from a LAN Connection
In some installations where a point-to-point audio-video connection is needed and it is not
practical to add twisted pair cable, there is the possibility of using spare twisted pair cable that is
behind the wall. For example if an Ethernet 10/100 LAN is installed and there is a LAN outlet
connecting two rooms between a PC and a LAN hub, it may be possibly to use the unused
twisted pairs from this connection. Ethernet 10/100 requires two (2) twisted pairs. These
twisted pairs must be terminated on pins 1&2, 3&6 of the RJ45 jack. Assuming a four-pair
Cat 5 cable was installed between the PC and the hub, there may be two unused twisted pairs
available behind the wall if they have not already been used for other services.
Assuming the spare pairs are available, the two spare twisted pairs could be diverted to a
second and/or third RJ45 outlet at both ends. This would allow up to two audio-video
channels to be transmitted via Cat5 between the two locations. The following diagram shows
how the two spare twisted pairs could be used to transmit stereo-audio or composite video and
monaural audio from one room to another.
In regard to crosstalk, there will be no interference between the audio-video signal and the
LAN signal under the same Cat5 cable jacket.
VideoEase MonoPro XLR Application Guide
© MuxLab Inc. 2005-2006 8
Rental and Staging Installations
In applications such as rental and staging, it is often desirable or necessary to use pre-existing
Cat5 cable, the MonoPro XLR is a cost-efficient method for accessing the structured cabling
system.
For example an audio source may be situated at one end of a hall and a cluster of active
loudspeakers are at the opposite end, the loudspeakers may be connected to the audio source
via a local telecom room and modular outlets. A single home run Cat5 cable will support up to
four (4) audio connections. By breaking out the cable to four individual modular jacks, up to
four loudspeakers can share the same Cat5 cable.
Adding a Cat5 stranded UTP cable to each MonoPro XLR and plugging the final assembly into
the wall outlet makes the connections between the equipment simpler as shown in the following
diagram.
Conclusion
Should you require additional information, please contact MuxLab Customer Technical Support
for assistance or visit MuxLab’s website at www.muxlab.com.
MuxLab Inc.
8114 Trans Canada Hwy
St. Laurent (Quebec)
Canada H4S1M5
Telephone : ....................................514-905-0588
Toll-free (North America) : .........1-877-689-5228
Fax : ..............................................514-905-0589
E-mail: vide[email protected]
URL: www.muxlab.com
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