This is an interesting thread. It shows how difficult to
convince Apple that there is an issue. Probably the
answer from a prominent Linux USB developer finally
wakes them up...

The center of the issue is that often MCU developers use
CDC-ACM for virtual serial port usage. And Apple insists
popping up network preferences dialog for these device
even though they are clearly not a modem.

Start of the thread.
http://lists.apple.com/archives/usb/2011//May/msg00051.html

Then quite a few follow-ups in June.
http://lists.apple.com/archives/usb/2011//Jun/index.html

Apple claims that they are correct since CDC-ACM device
are networking device.
http://lists.apple.com/archives/usb/2011//Jun/msg00006.html
"Since your device is declaring itself to be a networking device.
That is what a CDC ACM device is.  We are actually doing the right thing.
In the past we had complaints because when a user plugs in a real
CDC ACM device there was no way for the user to know where to
go to configure the dial up connection.  As far as I know the USB
Device working group is not working on any standards for serial devices
that are not related to networking.  When you use a Standard device
type for some other use we have no way of knowing this."

Paul kind of gave up.
http://lists.apple.com/archives/usb/2011//Jun/msg00009.html

The discussions came back on September.
http://lists.apple.com/archives/usb/2011//Sep/index.html

Paul has more findings here.
http://lists.apple.com/archives/usb/2011//Sep/msg00027.html

Then I asked in the Linux usb mailing list and got the answer back
to confirm his findings.

Summary of the issue:
http://lists.apple.com/archives/usb/2011//Sep/msg00031.html
"The issue is the network preferences dialog popup appearing the
first time a OS-X user first connects any USB Communication
Class device.

In the common case where the device is a modem or network
interface, it's a real benefit.  Modems in particular need manual
user settings, so automatically prompting the user has excellent
usability.

But the usability is terrible in the increasingly common scenario
where a non-modem device uses this protocol.  Unexpected
appearance of the network preferences can very falsely alarm
users.  At the least it's confusing or distracting."

Apple finally seems to recognize that there is an issue. Hopefully
they will fix in future version of Mac OS X.
http://lists.apple.com/archives/usb/2011//Sep/msg00032.html

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Xiaofan
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