How come DisplayPort is suddenly behind HDMI in bandwidth?
DisplayPort 2.1b Arriving This Spring With DP80LL Cables
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Originally posted by anarki2 View Post
Nah.
The real reason is that pretty much all TV makers are members of the HDMI consortium. So to them, license fees don't really matter, it's just a matter of accounting, they're moving money from one pocket to the other.
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Originally posted by DumbFsck View PostPeople talking about using optical could be better informed.
It is too expensive, the light has to be high quality, fast pulsing, that is expensive and it gets hot, so you must have a way to distribute the heat and possibly actively cool it.
All of it is undesirable to put in consumer and "cheap" home appliances like TVs.
SPDIF is VERY different, as that has basically no bandwidth at all (in comparison).
40G QSFP+ SR4 100m 850nm MPO Optical Transceiver
QSFP+ 40G SR4 Transceiver module is a parallel 40Gbps Quad Small Form-factor Pluggable (QSFP) optical module. It provides increased port density and total system cost savings. The QSFP full -duplex optical module offers 4 independent transmit and receive channels, each capable of 10Gbps operation for an aggregate data rate of 40Gbps over 100 meters of OM3 multi-mode fiber.
An optical fiber cable with an MPO/MTPTM connector can be plugged into the QSFP module receptacle.
A 200G transceiver from the same supplier operates at 5 Watts
Price could well be the stopper. Heat management won't be.
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Originally posted by Old Grouch View Post
Hmm, this 40G transceiver for 100M fibre dissipates 1.5 Watts. Admittedly, the price might be a little high.
A 100 Gbit/s BiDi Optical Transceiver (Bidirectional, operating at two separate wavelengths, one for send, one for receive, so you need but a single fibre) uses 3.5 Watts. You'll need to download the PDF product spec. to see the number.
A 200G transceiver from the same supplier operates at 5 Watts
Price could well be the stopper. Heat management won't be.
Also, apparently HDMI over fibre for like 50gbps can be bought at amazon for 50 quid. Of course I don't know about the quality, but for 100ft, it can't be too bad right?
So cost must be the reason, maybe their "lack of toughness"/fragility.
As clearly demonstrated I don't know enough about it to make an educated guess. I could've sworn I read on some discussion of SPDIF people talking about heat. So now I'm not even sure what I do know from what I don't.
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Originally posted by DumbFsck View Post
I stand corrected. Thank you.
Also, apparently HDMI over fibre for like 50gbps can be bought at amazon for 50 quid. Of course I don't know about the quality, but for 100ft, it can't be too bad right?
So cost must be the reason, maybe their "lack of toughness"/fragility.
As clearly demonstrated I don't know enough about it to make an educated guess. I could've sworn I read on some discussion of SPDIF people talking about heat. So now I'm not even sure what I do know from what I don't.
The diameter of the core of multi-mode fibre is 62.5 micrometres - for comparison, human hair varies in diameter from about 60 to 120 micrometres. The connector needs to align two optically-flat faces of that diameter together, without dust between them, or scratches on the surface. This is routinely done with optical connectors that simply click into place, which is a minor miracle. The interface is easily damaged, and not the kind of thing you want exposed the environment of a laptop in a carrying bag. There's also a minimum bend radius for optical fibre, which can be 20 times the diameter of the fibre+cladding if the fibre is under tension (typically when being installed), which is easy to undershoot and damage the fibre. So while optical fibre has impressive data-carrying capacity, it is not robust in everyday use. TOSLINK™ is very forgiving because its data-carrying capacity is so low.
Electrical connectors can be designed to wipe themselves clean of dust and surface oxidation when things are connected, and be designed to do so for a certain (high) number of connection-attempts, giving good electrical contacts - doing so on optically-flat optical-fibre surfaces will lead to scratches in no time, If you are doing a 'one-time' install, then optical is a great technology. Continually connecting and disconnecting - no so much.
HDMI connectors are specified to be able to cope with 10,000 insertions/disconnection cycles. By contrast, typical optical connectors are rated for 500-1,000 cycles.
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Originally posted by DumbFsck View PostSo cost must be the reason, maybe their "lack of toughness"/fragility.
Certified 8K cables are also thick as finger and break at connector edges as you have to bend them to hide behind the wall, but it is a pain. Optical ones are pretty sleek and elastic.
Basically my idea was, without the bull crap complaints, the DACs are already there in the market, around 50€. There are connectors, ICs, just make it standard.
Why fooling around with 3d party? Like creating additional market for things that should be there by default.
Optical is the way to go.
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at this point i wonder why there is not a video card like device (as end-point) connected with some direct output to the tv/monitor and just transport PCIe/CXL to the host device over some standardized fiber cabling with QSFP28 connectors... to much drama and frustrations over doing the same thing as everything in networking (namely moving bits fast over cabling)
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