[c-nsp] Cisco USB to serial cable/pinouts

Eric Van Tol eric at atlantech.net
Wed Jan 13 13:13:09 EST 2016

> OTOH, Fig. 3-23 suggests that there is a "real" USB host port
> (the "EIA Console Port") which might be able to drive a USB-to-serial,
> if it's the right now - if it can be used to connect a modem, it can
> be used to connect to a console server.  But I'd assume that it only
> works with a Cisco Certified USB To Serial Cable, which is made by
> the Cisco Certified Optics Department and appropriately priced.

There are actually 4 USB 'ports' on the ASR920:

'USB MEM' - This is for a USB memory stick.
'USB CON' - This is the Type-A USB port.
'AUX CON' - I had thought this is for a USB modem?
'CONSOLE' - This is the EIA connection. I tried connecting my USB-to-Serial adapter to this, too, but no luck.

Thanks for the documentation link - I actually found another link on there that has the pinouts, but as you say, I don't think it will do me much good:


On the bright side, I seem to have learned more about USB today than I think I ever wanted to know.


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