Optical cable polarity

[b345t]

Hi, I have recently purchased an MSB Premier, a really great DAC..Prior to this I have never used an optical cable in my system and noticed what I believe to be polarity labels, with 'A and B' on each side of cable. I also checked the inputs on the optical side on the Pro usb module, as well as the optical input in the module inside the DAC and there are two different colours, Yellow and Black.

What is the correct way to connect the cable? Thanks!

 

[djsina2]

Connect it and see if you get link. If you get link the polarity is correct. A LC connector can only plug in one way. You should get link. If you don’t you can switch the polarity by removing the plastic piece which holds the two simplex connectors together and reverse them (on one end only).

 

[Sablon Audio]

A million years ago, I had an Audio Synthesis transport and decade which relied upon a bespoke dual st (glass) lead interface. There was definitely an audible directionality to the cables, which you should experiment to find your preference. I was also recommended the Aural Symphonics ioGel to apply to the glass cable ends and this was very worthwhile in reducing glare and making the presentation more solid.

 

[djsina2]

A million years ago, I had an Audio Synthesis transport and decade which relied upon a bespoke dual st (glass) lead interface. There was definitely an audible directionality to the cables, which you should experiment to find your preference. I was also recommended the Aural Symphonics ioGel to apply to the glass cable ends and this was very worthwhile in reducing glare and making the presentation more solid.

Impossible. Polarity can only be one way or there will be no functioning link. In a duplex fiber configuration the transceiver Tx on one side needs to mate with the transceiver Rx from the other side.

Fiber Polarity Basics

Polarity defines direction of flow, such as the direction of a magnetic field or an electrical current. In fiber optics, polarity is directional; light signals travel through a fiber optic cable from one end to the other. A fiber optic link’s transmit signal (Tx) at end of the cable must match...

www.flukenetworks.com

The video also shows how to change polarity as I mentioned above by removing the clip and reversing the connectors. Again, this should not be needed under normal circumstances and the link is only going to work one way.