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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.  
 

Summary of Contents for VideoEase MonoPro XLR

Page 1: ...VideoEase MonoPro XLR Application Guide MuxLab Inc 2005 2006 1 VideoEase MonoPro XLR Application Guide Version 1 01 Jan 2006 ...

Page 2: ...s 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 e...

Page 3: ...tatively 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 follow...

Page 4: ...e 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 t...

Page 5: ... 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 ...

Page 6: ...he 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 follow...

Page 7: ...irs 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 ...

Page 8: ...le 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 requir...

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