D-Link DI-308 - Manual (Page 99)

DI-308 ISDN Remote Router
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Press <Enter> to access the next screen:
•
Phone Number – Enter your own phone number here to establish a connection
between your ISDN B1 and B2 channels.
•
Packet Length – [1 to 1500 bytes]. This field allows you to define different sized
data packets to test the ISDN line.
•
Start Test - press <Enter> or <Return> to begin the test.