Why didn't you look in the archive? The answer was that the protocol says 
it is vendor specific.

On Sat, 8 Mar 2003, Disma Goggia wrote:

> I'm really sorry, but I've read the answer and I've deleted it...
> 
> Maybe it is a dumb question but:
> 
> bash-2.05b# cat /proc/bus/usb/devices
> T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=12  MxCh= 2
> B:  Alloc=  0/900 us ( 0%), #Int=  0, #Iso=  0
> D:  Ver= 1.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
> P:  Vendor=0000 ProdID=0000 Rev= 0.00
> S:  Product=USB UHCI Root Hub
> S:  SerialNumber=fcc0
> C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  0mA
> I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
> E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=255ms
> bash-2.05b# cat /proc/bus/usb/devices
> T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=12  MxCh= 2
> B:  Alloc=  0/900 us ( 0%), #Int=  0, #Iso=  0
> D:  Ver= 1.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
> P:  Vendor=0000 ProdID=0000 Rev= 0.00
> S:  Product=USB UHCI Root Hub
> S:  SerialNumber=fcc0
> C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  0mA
> I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
> E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=255ms
> T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  3 Spd=12  MxCh= 0
> D:  Ver= 1.10 Cls=02(comm.) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
> P:  Vendor=07b0 ProdID=0007 Rev= 1.00
> S:  Manufacturer=ISDN USB TA
> S:  Product=ISDN USB TA
> S:  SerialNumber=ISDN USB TA
> C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr= 90mA
> I:  If#= 0 Alt= 0 #EPs= 0 Cls=02(comm.) Sub=80 Prot=ff Driver=(none)
> I:  If#= 1 Alt= 0 #EPs= 0 Cls=0a(data ) Sub=00 Prot=ff Driver=(none)
> I:  If#= 1 Alt= 1 #EPs=16 Cls=0a(data ) Sub=00 Prot=ff Driver=(none)
> E:  Ad=01(O) Atr=03(Int.) MxPS=  16 Ivl=1ms
> E:  Ad=81(I) Atr=03(Int.) MxPS=  16 Ivl=1ms
> E:  Ad=02(O) Atr=03(Int.) MxPS=  16 Ivl=1ms
> E:  Ad=82(I) Atr=03(Int.) MxPS=  16 Ivl=1ms
> E:  Ad=03(O) Atr=03(Int.) MxPS=  16 Ivl=1ms
> E:  Ad=83(I) Atr=03(Int.) MxPS=  16 Ivl=1ms
> E:  Ad=04(O) Atr=03(Int.) MxPS=  16 Ivl=1ms
> E:  Ad=84(I) Atr=03(Int.) MxPS=  16 Ivl=1ms
> E:  Ad=05(O) Atr=01(Isoc) MxPS=  16 Ivl=1ms
> E:  Ad=85(I) Atr=01(Isoc) MxPS=  16 Ivl=1ms
> E:  Ad=06(O) Atr=01(Isoc) MxPS=  16 Ivl=1ms
> E:  Ad=86(I) Atr=01(Isoc) MxPS=  16 Ivl=1ms
> E:  Ad=07(O) Atr=01(Isoc) MxPS=  16 Ivl=1ms
> E:  Ad=87(I) Atr=01(Isoc) MxPS=  16 Ivl=1ms
> E:  Ad=08(O) Atr=01(Isoc) MxPS=  16 Ivl=1ms
> E:  Ad=88(I) Atr=01(Isoc) MxPS=  16 Ivl=1ms
> I:  If#= 1 Alt= 2 #EPs= 6 Cls=0a(data ) Sub=00 Prot=ff Driver=(none)
> E:  Ad=81(I) Atr=03(Int.) MxPS=  64 Ivl=4ms
> E:  Ad=82(I) Atr=03(Int.) MxPS=  64 Ivl=4ms
> E:  Ad=83(I) Atr=03(Int.) MxPS=  64 Ivl=4ms
> E:  Ad=05(O) Atr=01(Isoc) MxPS=  16 Ivl=1ms
> E:  Ad=06(O) Atr=01(Isoc) MxPS=  16 Ivl=1ms
> E:  Ad=07(O) Atr=01(Isoc) MxPS=  16 Ivl=1ms
> 
> According to the documentation (howto and acm.txt), it should be an ACM USB 
> modem (since Cls=comm and Cls=data); plugging in the modem the ACM driver is 
> "automagically" loaded, but no device is created (and if I mknod I can't 
> minicom to it).
> 
> I've tested another usb modem that has for sure a vendor-specific interface, 
> in fact it looks totally different (Cls=ff)
> 
> Am I missing something?
> 
> How can I identify an ACM modem from the package (example: I discard every 
> modem with a "Com Port simulation" print on the package...)?
> 
> Have you got a recommended (or linux-working) ISDN modem/TA?
> 
> Any help really appreciated.
> 
> Disma
> 
> 
> 
> 
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