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Full Discussion: Restarting/Resetting a USB Port?
Top Forums UNIX for Dummies Questions & Answers Restarting/Resetting a USB Port? Post 302929385 by hicksd8 on Saturday 20th of December 2014 05:48:43 AM
Old 12-20-2014
Having read your post a few times I think that you may be going about this the wrong way. You shouldn't need to reset the USB port, the modem software (driver should take care of it.

Firstly, what operating system is it????

Do you definitely have the correct Conexant driver for that O/S?

A modem is a serial port device but in this case the serial port is a virtual one inside the USB driver on the host.

If the remote end hangs up, the local modem should detect carrier loss and, through the USB interface, notify it's host uSB driver, which in turn should signal to the O/S that the remote end has gone away. The local O/S responds by closing the session/process thereby clearing down the modem (virtual) port.

So do you have the right USB driver for your O/S?

and

Is the local modem configured to correctly report a loss of carrier (DCD signal)? See modem manual for that one.
 

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LEARN ABOUT CENTOS

ehci

EHCI(4)                                                    BSD Kernel Interfaces Manual                                                    EHCI(4)

NAME

     ehci -- USB Enhanced Host Controller driver

SYNOPSIS

     device ehci

DESCRIPTION

     The ehci driver provides support for the USB Enhanced Host Controller Interface, which is used by USB 2.0 controllers.

     EHCI controllers are peculiar in that they can only handle the USB 2.0 protocol.  This means that they normally have one or more companion
     controllers (i.e., ohci(4) or uhci(4)) handling USB 1.x devices.  Consequently each USB connector is electrically connected to two USB con-
     trollers.  The handling of this is totally automatic, but can be noticed since USB 1.x and USB 2.0 devices plugged in to the same connector
     appear to connect to different USB busses.

SEE ALSO

     ohci(4), uhci(4), usb(4)

HISTORY

     The ehci device driver first appeared in FreeBSD 5.1.

BUGS

     The driver is not finished and is quite buggy.

     There is currently no support for isochronous transfers.

BSD                                                               March 20, 2005                                                               BSD
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