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Loopback Test
An error
USB connection
message
error
appears after the
test
ISDN S0 cable
error
ISDN S0 bus
error
Different types of
S0 cables used
ISDN error
Second B
0x3492
channel busy
ISDN error
Incorrect phone
0x3492
number
11. Troubleshooting
Has the PC been
Establish correct
correctly
USB connection.
connected to I-
Surf USB?
Has I-Surf USB
Establish correct
been correctly
ISDN connection.
connected to the
ISDN outlet?
Is the S0 cable
Establish correct
between the S0
S0 bus
outlet and the
connection.
ISDN NTBA
correctly wired?
Are the terminal
resistors in
place? Does a
standard ISDN
phone work when
connected to this
S0 outlet?
Disconnect other
Replace the
devices
cable of the other
connected to the
ISDN device.
S0 bus and
repeat the test. Is
it passed now?
Is a connection
Terminate all
may be active on
other
the second B
connections.
channel?
Is the phone
Enter the correct
number dialed
number.
the adapter's
MSN?
57
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