Is coax 75ohm stupid legacy for home use?

[antcollinet]

Did you read the post?

Read the post again!

A strangely aggressive tone to use when you are asking for help.

 

[DonDish]

A strangely aggressive tone to use when you are asking for help.

You may just be right about that. If you read my post and its totally incomprihensible, Ill give you another right! Sounds like a deal to you?

 

[DonDish]

@voodooless Sorry for harsh language! Peace and love <3

 

[Kal Rubinson]

AES-EBU digital audio normally uses 110ohm twisted-pair cable, for the reason that this cable can be used equally well for balanced analogue audio, so when wiring a studio facility, only one type of cable needs to be installed, which can then be used for both digital and analogue audio.

And, fwiw, Cat6 consists of multiple 110ohm twisted-pair cables.

 

[voodooless]

And, fwiw, Cat6 consists of multiple 110ohm twisted-pair cables.

Any ethernet cable does CAT6 just rated for higher speeds.

 

[DonDish]

The thing with ethernet its four twisted pairs. Its four streams of data or eight? I need to accomodate 8 plus AES earth. 9 pins. Hmmm...

 

[voodooless]

The thing with ethernet its four twisted pairs. Its four streams of data or eight? I need to accomodate 8 plus AES earth. 9 pins. Hmmm...

You have:

- AES In
- AES Out
- SPDIF In
- SPDIF Out

That can be done over the 4 pairs.

Take shielded cable so you can connect ground. The SPDIF - pins are probably already ground..

 

[sergeauckland]

The thing with ethernet its four twisted pairs. Its four streams of data or eight? I need to accomodate 8 plus AES earth. 9 pins. Hmmm...

Just get an 8 pair STP cable, and common up all the screens.
S.

 

[DonDish]

You have:

- AES In
- AES Out
- SPDIF In
- SPDIF Out

That can be done over the 4 pairs.

Take shielded cable so you can connect ground.

That would work. Shield and chassi ground is connected anyway. My question: The twisted pair tech utilizes the elctromagnetic field around the cable in some way right. Does it act as one cable with paralell streams, or is it two cables with two different streams. I have some quad star and other stuff, but really never grasped the concept.

 

[DonDish]

Just get an 8 pair STP cable, and common up all the screens.
S.

Thnxs. I dont have to dremel into the shell either

 

[voodooless]

That would work. Shield and chassi ground is connected anyway. My question: The twisted pair tech utilizes the elctromagnetic field around the cable in some way right. Does it act as one cable with paralell streams, or is it two cables with two different streams. I have some quad star and other stuff, but really never grasped the concept.

It’s four individual twisted pairs, with an optional shield, or optionally, every pair can be shielded as well. For Ethernet, it will carry 4 separate data streams.

 

[DonDish]

The twisted pair tech utilizes the elctromagnetic field around the cable in some way right

They used it on phone lines with four twists per kilometer, to match electromagnetic interference from neighbour power lines. Amazing! I gotta get a dummies book. Thnxs for all the help guys! All this will come handy

 

[voodooless]

They used it on phone lines with four twists per kilometer

Where do did you get that information? That sounds like you misunderstood something. 4 twists per km would not do anything useful, and phone lines aren’t usually differential either.

 

[Blumlein 88]

Where do did you get that information? That sounds like you misunderstood something. 4 twists per km would not do anything useful, and phone lines aren’t usually differential either.

Early phone days. Power lines and trolley supply lines were causing phone interference. Alexander Graham Bell started swapping lines on a pole 4 times per kilometer or about 6 times per mile. The earliest twist to stop interference at 60 hz. Those were balanced too. So yes, some misunderstanding.

 

[Timcognito]

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[voodooless]

Early phone days. Power lines and trolley supply lines were causing phone interference. Alexander Graham Bell started swapping lines on a pole 4 times per kilometer or about 6 times per mile. The earliest twist to stop interference at 60 hz. Those were balanced too. So yes, some misunderstanding.

Ah, I didn’t look that far back! Great info

 

[Kal Rubinson]

It’s four individual twisted pairs, with an optional shield, or optionally, every pair can be shielded as well. For Ethernet, it will carry 4 separate data streams.

The thing with ethernet its four twisted pairs. Its four streams of data or eight? I need to accomodate 8 plus AES earth. 9 pins. Hmmm...

It's all explained if you look up AES72. https://www.aes.org/publications/standards/search.cfm?docID=108

 

[voodooless]

It's all explained if you look up AES72. https://www.aes.org/publications/standards/search.cfm?docID=108

That is paywalled.. plus I don’t see how AES72 is relevant to the problem at hand?

 

[Kal Rubinson]

That is paywalled.. plus I don’t see how AES72 is relevant to the problem at hand?

Well, if you could read it, you would see that it defines standards for audio (digital and analog) over multiple twisted pairs (CATn) wiring. It also links to academic papers that evaluate (very positively) its performance compared to standard audio cables.

 

[antcollinet]

Well, if you could read it, you would see that it defines standards for audio (digital and analog) over multiple twisted pairs (CATn) wiring. It also links to academic papers that evaluate (very positively) its performance compared to standard audio cables.

That is interesting - and not totally surprising. Any cable capable of Gb/s data over 100m should stomp all over audio stuff.

But why are we not using it?