Huh?
You are talking about a fiber cable, right?
So the thickness is just a jacket around the same sized fiber.
I suspect that they use a thicker jacket on shorter cables as a way to protect the cable from possible damage. Usually the longer fibers will be used for in the wall/ceiling runs so less handling.
You are making a serious confusion!
My answer is for Sirpopealot, who said that he could not connect the RS130 to the RD160 via fiber optic and used an Amphenol DAC cable instead.
The DAC (Direct Attach Copper) cable is a budget option for fiber optic connection and is a COPPER cable!!! The thickness of the COPPER wire varies depending on the length of the cable, being larger for longer cables!
Optical fiber has standardized thicknesses for single mode and multimode fiber.
To protect the fiber from damage, steel reinforcement is used!
If you had at least read the posts on this site about fiber optic connections you wouldnât have made these mistakes! Or if you had used google search before writing! 
It might help you understand a little if you read here:
Ah. Now you know why I started with a âHuh?â 
Err yes and no.
So w the SFP/SPF+ interconnects you can use copper. While it is cheaper, usually, there are some other benefits like less heat. (Your transceivers ⌠those bits at the end of the cable that plug in to the port⌠they can get hot⌠very hot depending on the transceiver and speed.) And at these interconnect speeds your copper interconnects are going to be limited by length. The longer the run, the lower the bandwidth.
CAT 8 will give you 40Gb/S speeds but at a limited length.
Also, thereâs the issue of longevity. The fiber optic transceivers can go bad over time. Copper wires⌠less of an issue.
Now when you talk about the cableâs wire gauge⌠again not sure if youâre talking about the overall outer diameter or the actual wires inside. Since youâre talking about interconnects⌠if you are looking at a component from the bottom rack to a ToR on the top rack⌠its at most 6â for a 42U rack. This is why you will sometimes see the ToR in the middle of the rack. (Oh wait⌠not sure if you actually know or have wired racks of servers.) But I digress. The point is that at these short distances you really donât need to worry about the gauge of the individual wires. While I said 6â max, most interconnects are 1m or less.
[edit] Those are patch cables 1m or less. Wiring in a cabinet is a bit longer. The point here is at these distances the wire gauge is less of an issue. (to a point) Its not like speaker wires where you have long runs.
Now w.r.t SFP/SFP+ the reason you donât see a lot of copper, it is that you end up becoming bandwidth constrained. Fiber transceivers can do 400Gb/S speeds. Copper tops out at 40Gb/S which is your CAT 8 spec. Here the Hifi Rose is what? 1Gb/s port speed or 10Gb/s port speed depending on which product and port?
And yes⌠you can find different thicknesses of a jacket around the fiber. (Note if you reread what I wrote I said the fibers are the same size.) This is done to protect the fiber.
You are totally wrong!
I was referring to the thickness of the conductor in the cable NOT the thickness of the sheath!
What is the importance of the thickness of the sheath in a cable???
The copper conductors used in the DAC cable are solid not braided and can break very easily.
SFP and SFP+ modules are guaranteed to operate for millions of hours, and the serious SFP modules have the DDM/DOM function (How to Understand DDM/DOM Function of SFP Transceiver | by Orenda | Medium).
But that is not the main objective in this discussion (to work as long as possible and be as cheap as possible), but what is the best equipment for sound!
I think youâve got the wrong forum!
About SFP modules:
Well, anyway, I did order a pair of Finisar FTLX1475D3BTL modules to try between the RS130 and RD160. My favorite connection at the moment remains the Amphenol passive copper DAC cable. I continue to be frustrated with the Rose Connect app indication that the connection is USB and not the SFP port. For that reason I utilize I2S frequently. I2S has been my connection with coffee and music this morning. Absolutely beautiful sound streaming Arooj Aftab - Night Reign via Roon/Qobuz.
Dude,
Did you actually read what I wrote?
Free clue. At l-2m length, the gauge of the wire, especially for digital data is not a major concern.
You can go google about it and see the numbers.
And yes they do put thicker jackets on certain fibers. Its to help protect the fibers when in different environments.
You are very tiring!
Either you donât understand simple concepts orâŚ
Which is why I stop reading what you write and you get a big block.
People thinking they have âCAT7â cables really should not be offering any networking advice. Neither should people believing that a fiber brand makes any difference, or that I2S sounds betterâŚ
@BorisM I do not appreciate your comments, completely inappropriate and certainly not in the spirit of what this community is all about.
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This post was flagged by the community and is temporarily hidden.
This post was flagged by the community and is temporarily hidden.
Well dude, I actually do have cat 8 rated patch cables.
Oh wait, youâre an âaudiophileâ.
Iâm just some guy who works in IT and has a cluster of servers in my home office.
Been doing IT for far too many years.
Apparently reading comprehension isnât your strong suite. And from the mention of CAT7 cables, neither is IT. Must be a tough life.
For you maybe.
I guess youâre not familiar w the IEEE 802.3 standards? Or the working group that set the standard?
The Category 8 standard was developed by the ANSI/TIA-568 standards body, more specifically, the TR42.7 committee. The document that details Category 8 cabling is ANSI/TIA-568-C.2-1, and was published in November 2016 as a standard, therefore Category 8 is no longer in a draft format.
Now I said CAT 7 which was an earlier standard. CAT 8 cables will probably be the last because of limitations on speed in terms of using copper cables.
As you were saying?
Do you also want to talk about RF Interference in terms of patch panel / cord length cables and why the gauge of wire is less of an issue at these short distances?
But I bet you can hear things over 100kHz too right?
Iâm just an old guy whoâs hearing has dropped to between 16kHz and 17kHz on a good day.
Just look up what CAT7 standard is, then get back to us, when you manage to jam a CAT7 cable up your Rose. Or, stick to discussing speaker interconnects with the equally clueless.
Poor Boris
Doesnât know much about RJ45 Ethernet cables and their CAT ratings.
I even show him the standard group and he still doesnât get it.
BTW my RS520 does have an RJ45 Ethernet port.
What Rose products do you own?
Poor schlemazl, he keeps repeating some fancy words he had heard from sisterâs nephewâs friendâs uncle who did some cable running in 1960. Or, most likely, just keeps reading Fraudioquestâs ad copy.
Now, go, look up CAT7 standard, find where does it have an RJ-45 connector (hint, hint), and stop bothering grown-ups with your nonsense.