Subject: Re: Working USB<->serial spotted in the wild!
To: Wolfgang Rupprecht <wolfgang+gnus20011207T082751@wsrcc.com>
From: David Johnston <firstname.lastname@example.org>
Date: 12/08/2001 11:43:28
On Fri, Dec 07, 2001 at 08:47:00AM -0800, Wolfgang Rupprecht wrote:
> email@example.com (Peter Seebach) writes:
> > The local Micro Center carries (carried?) a USB/Serial converter made by
> > QVS, under the model number "USC-1000", or "USC-1009F", depending on which
> > label you believe. It looks as though the "1009F" means it comes with a 25-9
> > pin adapter.
> One thing you may want to also try is ppp over this adaptor. I spent
> quite a while trying to get ppp over a utty configured only to find
> out that the problems went away when I switched to a real tty/com
> model: DSB-S25
> umct0: MCT Corporation. USB-232 Interfact Controller, rev 1.00/1.02, addr 4
> The symptoms were that the serial-line comms worked just fine, the PPP
> LCP packets were full duplex, but none of the IP from the remote side
> made it into the IP stack in the kernel. Tcpdump showed outgoing
> packets, but only incoming LCP. Weird.
I'm currently running PPP over my USB to serial adaptor. It works pretty
well, but not flawlessly. It'll run for a few days then something kills the
USB layer and I need to re-boot the machine to get anything USB working again.
I suspect this is a problem in the USB layer, or an interrupt problem in the
macppc kernel, as I see similar problems with other USB devices (a USB to
parallel port converter will similarly kill the USB layer after printing
a few files).
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