There is a lot of interest in lower-cost optics, but manufacturing costs for the alternatives to today's active optical cables have not provided the promised cost savings. Silicon photonics seems to be just a few years away just as fusion is just a decade away.
On Wed, Jan 17, 2024 at 6:16 PM Lux, Jim (US 3370) via Beowulf < beowulf@beowulf.org> wrote: > To a certain extent, faster Ethernet is more likely to be a commodity – > and at rates above 1 Gbps, there’s substantial “art” in making a PHY that > works reliably. At the 10G speed, there’s things like RapidIO and SRIO, > but they > > 1. Only work for short distances (<<1 meter) > 2. Are **very** board layout and other implementation sensitive. Fine > for getting in and out of a package, but not great for running any > distance. > > Then there’s XAUI (pronounced Zowie!) which is a multiwire wire interface > between logic and 10G (or whatever) PHY. But it’s got the same problems > as SRIO/RapidIO (or for that matter, the venerable (now) TLK2711 SERDES). > > > > 10G and 40G Ethernet do actually work over distances of meters, and over > some moderate range of temperatures, and are likely to meet EMI/EMC > requirements. > > > > It is interesting that there doesn’t seem to be the same commercial > pressure for optical versions. They all exist, but typically as modules > you’d slide into your switch, not components you’d solder to a board. And > there are plenty of XAUI->optical kinds of interfaces. And optical cables > are cheap and relatively rugged. > > > > > > *From:* Beowulf <beowulf-boun...@beowulf.org> *On Behalf Of *Scott Atchley > *Sent:* Wednesday, January 17, 2024 7:18 AM > *To:* Larry Stewart <stew...@serissa.com> > *Cc:* Mark Hahn <h...@mcmaster.ca>; beowulf@beowulf.org > *Subject:* [EXTERNAL] Re: [Beowulf] anyone have modern interconnect > metrics? > > > > While I was at Myricom, the founder, Chuck Seitz, used to say that there > was Ethernet and Ethernot. He tied Myricom's fate to Ethernet's 10G PHYs. > > > > On Wed, Jan 17, 2024 at 9:08 AM Larry Stewart <stew...@serissa.com> wrote: > > I don't know what the networking technology of the future will be like, > but it will be called Ethernet. > - unknown (to me) > > _______________________________________________ > Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing > To change your subscription (digest mode or unsubscribe) visit > https://beowulf.org/cgi-bin/mailman/listinfo/beowulf >
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