I meant: The copper ones also work at 2.5 and 5 Gbit/s, not sure the fiber ones can do. I think those are restricted to 1, 10 and 25 Gbit/s.
Saludos, Jordi @jordipalet El 31/1/22 19:44, "NANOG en nombre de JORDI PALET MARTINEZ via NANOG" <[email protected] en nombre de [email protected]> escribió: Hi Bill, I did that a few months ago with SFP+. Purchased few with copper (different vendors), few with fiber (from Solid Optics, they provide a very nice USB interface to configure them if needed), and used them at different speeds, depending on the equipment on both sides. The copper ones also work at 2.5 and 5 Gbit/s, not sure For example, an old 1 Gbit/s SFP-only switch works fine connecting it to a newer switch that has SFP+ (10 Gbit/s). Of course, the speed goes down to 1 Gbit/s only. In this specific case, just for fun, I tried both copper and optical, and both worked. Some DAC and AOC also work the same as I know. Note that it may depend on the specific vendor/model, and some of them you may need to "program" them to support multispeed or a fixed speed. SFP28 is just an enhanced SFP+, an in fact SFP28 work in SFP+ interfaces. So it should be the same, as the electrical signals are the same. Regards, Jordi @jordipalet El 31/1/22 19:07, "NANOG en nombre de Bill Woodcock" <[email protected] en nombre de [email protected]> escribió: Hey, does anyone know of an SFP28 capable of rate-adapting down from 25G on the cage side down to 1G on the line side? Can be copper or fiber on the line side, I don’t care, my interest is in the chip inside. Thanks, -Bill ********************************************** IPv4 is over Are you ready for the new Internet ? http://www.theipv6company.com The IPv6 Company This electronic message contains information which may be privileged or confidential. The information is intended to be for the exclusive use of the individual(s) named above and further non-explicilty authorized disclosure, copying, distribution or use of the contents of this information, even if partially, including attached files, is strictly prohibited and will be considered a criminal offense. If you are not the intended recipient be aware that any disclosure, copying, distribution or use of the contents of this information, even if partially, including attached files, is strictly prohibited, will be considered a criminal offense, so you must reply to the original sender to inform about this communication and delete it. ********************************************** IPv4 is over Are you ready for the new Internet ? http://www.theipv6company.com The IPv6 Company This electronic message contains information which may be privileged or confidential. The information is intended to be for the exclusive use of the individual(s) named above and further non-explicilty authorized disclosure, copying, distribution or use of the contents of this information, even if partially, including attached files, is strictly prohibited and will be considered a criminal offense. If you are not the intended recipient be aware that any disclosure, copying, distribution or use of the contents of this information, even if partially, including attached files, is strictly prohibited, will be considered a criminal offense, so you must reply to the original sender to inform about this communication and delete it.
