Category Archives: Audio over CAT5

Problems of Assigning Channels Based on Color alone

AES, Audio over CAT5, Connections, IDentification Area, NAB, Pinout, Presentation, RJ45, T-568A
The need for 8p8c to 8p8c connectivity is of the utmost importance.
Second to is the “field breakouts”.  The colour plays a huge part.
I’ve been noticing more and more breakout tails entering the market, so it needs addressing.  We cannot use the 25 pair or TIA colour codes to determine the channels.
For the field, I would expect a simple visual inspection to influence deployment decisions.  Looking at the solid colours to determine the channel order.  Below is an image that has been the result of many conversations.  An observation I’d like to present:  If you look at RJ45 connectors the solid colours are visible. The order of the solid colour should dictate the channel order. Pair three in both cases is split around pair 2.  Pins of multiples of 2 are considered “Hot”.  QTP-B is based on the TIA-B wiring scheme. 
This is where a lot of QTP development started.  How to terminate this twisted 3M ribbon cable to an RJ45 Jack.  Since it would not fit and CAT cable is everywhere…
QTP-A and QTP-B

Making a QTP patching system using DB25 patchbays

Audio over CAT5, Balancing, CAT6-Audio Transfer, Connections, DB25, IDentification Area, Interface, Label Area, Presentation, QTP, QTP to DB25, Quad Twisted Pair, Rhumor, T-568A, Testing

Dual row, 24 Channel by 24 Channel
DB25 to DB25 patchbay wiring price:
(12)  QTP-DB25M              $12.04    = $144.48
(24) CAT6-10-Green         $7.80      =  $187.20
6 cable  price: $331.58   

Checking the spacing fit for QTP-DB25M adapters.

IMG_6285 IMG_6291 IMG_6294 IMG_6299 IMG_6301 IMG_6303 IMG_6307 IMG_6319Not a single problem detected.  With all signals balanced and power on two different phases, no measurable induced noise detected.

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