What max current will the rear USB actually supply 5V at?

[/df]

https://www.downloads.netgear.com/files/GDC/DS108/DS100series_datasheet.pdf

 

[prpr]

It's a 10 megabit hub and a 100 megabit hub with a switch between them.

Your evidence for this is what? It doesn't mention anything in the manual apart from the hubs are bridged (which admittedly is usually used to describe a software "switch" - but I don't believe it's not done in hardware).
Are you saying that two 10 Mbps devices nattering to each other won't generate any traffic on a 100 Mbps port?
I could probably set up a test with devices I can force the interface speed on, but it's not really worth the time.

Now I've found it, my unit is a DS106, compared to your DS108 which is somewhat of a different beast, as far as the front indicators go, to the other models in the series, but is probably (almost) identical internally.
(I think I must've chucked my EN104, or whatever it was, as being completely useless. I'm not sure now why I've kept the DS106 either.)

 

[Owen Smith]

Are you saying that two 10 Mbps devices nattering to each other won't generate any traffic on a 100 Mbps port?

Correct. Think about it, if traffic between devices on 100Mbps ports also sent that traffic to all 10 Mbps ports the 100 ports would be limited to 10 and there would be no point it being a dual speed hub, a 10Mbps hub would work just as well. Also there are separate collision LEDs for 10 and 100, if all traffic was repeated across all ports whether running at 10 or 100 there would only be one collision LED.

We used these at work over 20 years ago, and I assure you the 10Mbps traffic does not go to 100Mbps ports or vice versa. We were dealing with multiple video streams at 6Mbps so were easily capable of saturating 10Mbps.