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Serial port left marked busy?

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The Question is:

4 Clustered AlphaServers 2100/A 4/275
We have a modem hanging off TTA0:
Every so often we get in a situation while using the modem where there is a
 communication problem and TTA0: thinks that it is still busy. We don't think
 that it's the config of the modem or the terminal settings as 99% it is fine.
The question is how can I reset TTA0: to become idle again when it's got itself
 into this busy state.
There was a problem with the transmission, nothing is using this port anymore
show dev tta0:/full
Terminal TTA0:, device type unknown, is online, record-oriented device,
 carriage control, device is busy.
Error count                    0
Operations completed            4309978
Owner process                 ""
Owner UIC            [SYSMANAGERS,MATT]
Owner process ID        00000000
Dev Prot         S:RWPL,O:RWPL,G,W:RWPL
Reference count                0
Default buffer size                  80
The only way we have been able to clear it is to reboot the machine.
The workaround at the moment is to use a com port on one of the other Alphas
 and reboot the machine in an outage.

The Answer is :

  Please contact the Compaq Customer Support Center, as this would
  appear to be a rather unusual state within the terminal driver.

answer written or last revised on ( 8-MAY-2001 )

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