Audio over Cat5/5e/6 cables - Page 5

POTS is the oldest "electronic audio system" in existence, it uses a differential audio connection between central office and each telephone.
ITT/Canon XLR connectors were originally developed as AC power connectors.

I'm sure your many moons have yielded much valuble experience however if none of the systems you have experience with is equivalent to the loop I described it is irrelevant to the discussion at hand. This would appear to be the case per your description of your experience. None of the systems you describe maximizes loop area to make the resulting antenna effect gross and obvious enough to really be noticeable in a typical ambient EM environment.

Cheap RCA cables bundle the plus and minus conductors in the same cable housing minimizing loop area even if it is not twisted within the housing. This is also true with the mic cords and XLR cables I have seen.

Bottom line is because you haven't noticed the effect using industry standard cabling designed to minimize it is certainly no proof it does not exist.

Since UTP data cable is most effective when used in conjunction with the differential ckt for common-mode noise rejection, do all NICs, routers, hubs, etc. on our computer ntwk have differential ckt for data x'mission? Or it is not needed due to Packet switching mode? Can someone shed some light? Thanks.

Yes, it's the transformer present on all NICs and Network ports.

I can only speak to the designs I've been involved with or products I'm aware of. All that I have experience wih use differential signaling on the ehternet side.

The phys I'm familair with send/recieve differential signals whether the transformers are present or not.

Those of us who work with line and mic level signals day in and day out know that UTP cable can easily be used and IS used with balun systems for problem free, long distance xmission of these signals. in hundreds of thousands of installations all over the world.

You are attempting to introduce claims into the discussion that are simply not backed up in the real world or germane to the OPs question. I have asked you to post a single installation or device that uses UTP in a single ended, unbalanced configuration for audio or baseband video xmission and I am still waiting.

A theoretical discussion of how UTP may be beneficial as compared to other theoretically possible implementations of cables absolutely is germane to the OP's question. I happen to prefer to take a wider view of the world which includes the possibility of non standard cabling being used. It is the preferred engineering approach as opposed to jumping to conclusions which may or may not be valid. The OP never mentioned which cables to compare the UTP with and so not jumping to conclusions about which type he prefers them be compared with makes sense.

I'm not sure what you expect from me regarding posting an example. I stated originally that I have heard there are some who like using it. I don't have any pictures of an instance since it is not something I've tried and am simply not exposed to many, if any, other installations than my own. You might take up your disagreement with someone who actually thinks the benefits of UTP are necessary in their system. I have not found cables to be the most pressing issue with my own system and so have not taken the time to try cables which I've theorized will offer improvements over what I use now. Someday perhaps I will get the time to try some UTP, STP, coax etc.

is there another side?
All ethernet over TP uses differential signalling, it's a standard.

Of course, the cpu/mac side...typically single ended.

Correct, internal TTL like communications is typically single ended, just like internal signalling in most audio and video equipment, and pretty much everything else.
Not that it has any bearing on the topic, but since you brought it up, a PCI express NIC communicates within the PC over a differential serial bus....not everything is single ended, as you claim.

There is no more flesh on this horse.

I did say "typically" as in not always. My world is embedded products with no backplanes and no need for PCI. You would have a good point though if you were to say that PC's using PCI are a significant market which I suppose would logically employ mac/phys using the signaling of whatever bus they are expected to be used with. Not my world though so I really can't comment on that. Maybe "typically" was too strong a word and should have been replaced with "sometimes".

I've written firmware for embedded devices that utilise a PCI buss, they don't always have to have edge connectors on backplane, the specification can be used internally as well.
But again, you're way off topic

Interesting. What is the purpose of using PCI with no edge connectors?