Billion Electric Company ISDN TA128s ユーザーズマニュアル

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Quick Start Guide 
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4.  Press “Loopback Test” to begin the diagnostic procedure.  It 
will make a call from the B1 channel that returns through 
the B2 channel.  The D and B channels will be tested for 
line integrity. 
 
Uninstalling the tiny USB ISDN TA128 
If you decide to permanently remove the driver and utility of the 
tiny USB ISDN TA128 from your system, you must run the 
uninstallation program from the ISDN Utility program group as 
follows: 
1.  Click “Start”, “Programs” and click the “ISDN Utility” item. 
2.  Click the “Uninstall DRV & UTL” item.  The following ISDN 
Uninstallation Program window opens. 
 
3. 
Check the items that you want to completely remove from 
the Windows system and click “OK”.