Category Archives: AES

QTP DB25 Pin out standards

I had an integrator call today asking what the compatible pin outs of the QTP-DB25 adapters were .

QTP-DB25M and QTP-DB25M use the Tascam DB25 Pinout.
Channels 1-4 terminate to one RJ45 and 5-8 to the other. 

QTP-DB25F - Face 3:4Screenshot 2015-05-05 14.25.00QTP-DB25F - Face 3:4

If you are using AES in and out the pin out is identical.
CH 1-4 are IN 1-4  and CH 5-8 are OUTPUT 5-8 Tascam1

The Third Compatible pin out is the Yamaha AES pin out.  The QTP-DB25Y is only available in a male DB25 connector.  The IN the first RJ45 and OUT the second.

All the RJ 45 connectors terminate to the TIA -B standard and use the following pair and polarity designation
Screen Shot 2015-03-14 at 10.10.47 AM

QTP AES 110Ω to 75Ω SPDIF BNC over Quad Twisted Pair!



Some more Quad Twisted Pair results are in using custom wound transformers found in the renown Ward-Beck Systems  IMP series.

We’re finding an insignificant Jitter of less that 200 pico seconds across the spectrum at a clock speed of 192Khz, making QTP perfect for the transmission of digital AES signals up to 192Khz.  More to come!   Screenshot 2015-03-16 17.23.46
Screenshot 2015-03-16 17.36.04