I would definitely check the current draw on the 8816. When we had the storms earlier in the year, I quickly threw a 7805 (with a 10cm*10cm copper board as a heatsink) onto the 24v output of my APC DC UPS that powers my CRS109, and plugged that into my 8817. It runs fine, but the 7805 is ~40C when there is no traffic, and hits 75C while downloading linux ISO's. Which would suggest that it's pulling far more than the 500mA that USB will want to provide. I'd test it myself, but I gave the 8817 up as a bad joke, and went back to a Cisco 877 in bridge mode so I could control the SNR margin to get some stability on the line. :) FTTN ordered today, so not much longer on ADSL. Hoping that fixes our constant dropouts! On 6 October 2015 at 09:57, Mike Everest <mike@duxtel.com> wrote:
Hi All!
I've been discussing possibility of using USB port on 2011/951 series to power up a modem like TP-link 8816 which uses 5v power supply using a cable like this:
http://miniimg2.rightinthebox.com/images/384x384/201403/ljhnpo1394624693508. jpg
I checked with MT engineering team, and received promising response:
"The minimum output current both models can provide is 500mA. RB951Ui-2HnD and RB2011 with wireless should be able to supply even up to 1A of output current. RB2011 without wireless should be able provide up to 2A output current. Only note that we guarantee the minimum output current"
So TP-Link ships with a 5v/1A power supply and so assuming that the device actually consumes 'up to 1A' then perhaps routerBoards able to supply 'up to 1A' might actually work as a pair.
Although I'm thinking that the power consumption will increase as packet throughput increases on both, then perhaps as the transfer load ramps up, power available to the modem may be constrained, and so might cause trouble under load.
So I find myself wondering whether someone else may have already been own this path and so if you have, and are willing to share your observations, I'm most curious as to how it turned out! :-)
Cheers!
Mike.
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