Powered USB Hub

Since USB is so, um, universal it's not surprising to find a manufacturer who keeps model numbers and prices the same but has changed the chip(s) inside which may noticeably change performance, unfortunately. I.e., the popular D-Link DUB-H7

I have one of these that I like:

Note that very few hubs -- almost none once you're above 4 ports -- comes with a power supply beefy enough to provide a full 500mA to all ports; I've often felt that the ratio of the power supply's current output to "number of ports multiplied by 500mA" gave at least some indication of the quality of the design. (I.e., if they cut a bigger corner with the power supply, they probably made bigger cuts elsewhere...)

Manufacturers do this, of course, since it's incredibly unlikely anyone would actually have, e.g., 10 peripherals that all truly need 500mA on a

---Joel

Good direction pointing, Joel!

Based on power, I found this...

I have not nearly that much load, but that looks like a safe bet. ...Jim Thompson

Consider a powered USB 3.0 Hub? I see that they are not that much more expensive. Anyone know of problems with these?

-- Noah's Ark was built by amateurs, The Titanic was built by professionals. Row, row, row your boat gently down the stream ... Life is but a dream!

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

I have one of their USB-1gbs Ethernet adaptors. Its made well, and works. (although USB is only good for ~200mbs)

Cheers

Really? I thought it was 480mbs? That is, the main port..

Jamie

Belkin

It is, at least per the spec. max for USB 2.0. 480 Mbps, that is; 480 millibits per second wouldn't be all that useful...;-)

Bob M.

millibits per second wouldn't be all that useful...;-)

Neither is 'm'aynard.

Get a PCI card that adds USB functionality.

I was all set to buy a hub when I came across a computer lying on the sidewalk, and it had a USB board inside. No need for a hub after that, but I do get more USB ports.

Of course, if there was a special reason for a hub, you didn't mention it.

Michael

Let me know when you find some four port low profile USB boards laying around, for salvage. I need two. :)

Eeek, Senior moment? Well, I sure didn?t get the full 667mbs theoretical thruput, but is was somewhere around the USB port speed. Which must have been ~400mbs, not 200mbs. I should check it again. But the point was that it worked with out a hitch.

Cheers

'Cept for really cheap crap, i haven't had any hub problems.

You may wish to get some USB 3 hubs, but they are never more than 4:1.

Not a lurker, i post.

?-)

If you can't get 'em for free (and shipping is never really free), these are pretty cheap and have five ports:

That's not low profile. I bought two of these from another seller. Three weeks later I got an e-mail stating that the entire shipment was defective, and they refunded the money.

This is interesting:

Wow, that is.

I guess there's a lot of those "industrial" keyboards (either ruggedized or with extra keys or whatever), barcode scanners, etc. that have PS/2 interfaces and aren't going away any time soon? So on new builds it ends up being easier to stick in a card like that than to pick from the small number of motherboards that still have PS/2 keyboard/mouse support?

I've seen plenty of PS/2 to USB converters for keyboards and mice, but for industrial PCs I can see that a PCI card might be a bit more attractive.

There are gender flippers both ways.

The difference with this card is that it goes under the PCI bus and gets an interrupt assigned to it as in the legacy method and will almost always underlying OS support, whereas a USB to PS2 device will not get an interrupt and *has* to also have underlying OS support for an HID device.

It might even be Jorge proof. ;-)