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by GeertJohan7 hours ago |
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upvoteby topspin7 hours ago|
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That link notes:

"Card supports 10Gbit/s and 10/100/1000/2500/5000/10000Mbit/s Ethernet"

Nice to see; some NICs are shedding 10/100 support. Apparently, it's not necessary to do this, even in a low cost device.

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upvoteby jcalvinowens23 minutes ago|
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I also appreciate the 10/100 support. I recently needed it for some old voip equipment, and it was shockingly difficult to find an SFP+ module that worked in my 10G switch and supported 100mbps.
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upvoteby Tade05 hours ago|
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100 mode saved me once when I really really really needed to have a connection in that moment, but the ethernet cable glued to the wall that I was using had only three out of eight wires even functioning.
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upvoteby winter_blue4 hours ago|
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Don’t we need at least four for 100 Mbps?
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upvoteby Tade01 hours ago|
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According to the technician I spoke with, he could only detect three on their end.

The cable was chewed through by cats, so perhaps it was three just in that moment.

The connection was overall unreliable, so I guess it must have been four, just not all of the time.

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upvoteby reaperducer25 minutes ago|
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According to the technician I spoke with, he could only detect three on their end. The cable was chewed through by cats, so perhaps it was three just in that moment.

Ah, the old Cat-3 cable. Been there.

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upvoteby bluGill1 hours ago|
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There is two wire ethernet that supports 100. It isn't common, but automotive is starting to use it.
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upvoteby gsich46 minutes ago|
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3 pairs probably. But then again you only need 2.
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upvoteby lucb1e49 minutes ago|
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Low cost? The link mentions no price, only a "notify me" button as far as I can see. Does it show a(n estimated) price point for you somewhere?
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upvoteby topspin40 minutes ago|
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Low cost, as in not data center/server grade hardware.
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upvoteby userbinator7 hours ago|
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Low-cost devices are exactly where 10/100 is still widely used. On PCs, it's a common power-saving mode.
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upvoteby lostlogin5 hours ago|
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TVs too.
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upvoteby geerlingguy1 hours ago|
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And PoE security cams.
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upvoteby hsbauauvhabzb5 hours ago|
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For those of us who don’t know, how does it save power vs a 1gbe running at low throughput?
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upvoteby jech3 hours ago|
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> how does [100BASE-TX] save power vs [1000BASE-T] running at low throughput?

100BASE-TX uses just two pairs (lanes), one for sending and one for receiving. 1000BASE-T uses all four pairs, for both sending and receiving. Therefore, a 100BASE-TX interface that's only receiving needs to power up one pair. A 1000BASE-T interface needs to power all four pairs all the time.

I recall reading about some extensions that allow switching off some of the pairs some of the time ("Green Ethernet"), but I think that they require support on both sides of the link, and I'm not sure if they are widely deployed.

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upvoteby adastra225 hours ago|
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I assume it is for wake-on-LAN. This of course requires the NIC being powered on while the system is sleeping. Lower bandwidth mode = less power draw.
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upvoteby junon3 hours ago|
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100 is needed for embedded stuff, it'd render a lot of devices unusable (wiznet chips are popular and are 100 only). That'd suck.
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upvoteby Gigachad22 minutes ago|
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IKEA smart home hub is also 100mbit.
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upvoteby rleigh3 hours ago|
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There are plenty of embedded chips which only provide RMII. No RGMII or alternatives.
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upvoteby moffkalast4 hours ago|
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Lots of industrial sensors and devices only do 4 wire 100BASE-TX so if there's no fallback to that it would be a paperweight in those situations.
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upvoteby t3122274 hours ago|
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upvoteby the_mitsuhiko4 hours ago|
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That hasn't been true on switched networks in probably 20 years or so.
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upvoteby hnlmorg4 hours ago|
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Isn’t that only relevant for network topologies that rely heavily on broadcasting to multiple nodes. Eg token ring, WiFi and powerline adapters?

For regular Ethernet, the switch will have a table of which IPs are on which NIC and thus can dynamically send packets at the right transmission protocols supported by those NICs without degrading the service of other NICs.

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upvoteby hdgvhicv3 hours ago|
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I’ve seen some vlans hit 1mbit BUM filters, I think we had about 800 users on that one. To saturate a 10m link would require a help of a lot of broadcast traffic.

100m is fine. 10m is fine but I can’t think of anything that negotiates 10m other than maybe WOL (I don’t use it enough to be sure from memory).

If I didn ahve something esoteric it would be on a specialised vlan anyway.

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upvoteby vardump4 hours ago|
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We have switches now, hubs just don't exist anymore. Switches are not affected by some devices having a lower speed.
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upvoteby oliwarner4 hours ago|
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Is that really true? If so, is there a saner way to handle this than upgrade all the things to 10GBE? Like a POE ethernet condom that interfaces with both network and devices at native max speeds without the core network having to degrade?
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upvoteby eqvinox4 hours ago|
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> Is that really true?

It's not, cf. sibling posts. The GP probably learned networking in the 80ies~90ies when it was true, but those times are long gone.

(unless you're talking wifi.)

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upvoteby HHad34 hours ago|
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That is complete nonsense and not how switched networks work.
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upvoteby sschueller2 hours ago|
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A Framework SFP+ or SFP28 expansion would be sweet.
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upvoteby 17 minutes ago|
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deleted
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