Netopia Router PN Series - Manual (Page 213)

Utilities and Tests 10-9
Factory defaults
You can reset the Netopia Router to its factory default settings.
Select the Revert to Factory Defaults item in the Statistics,
Utilities, Tests screen and press Return. Select CONTINUE in the
dialog box and press Return. The Netopia Router settings will return
to the factory defaults, deleting your configurations.
The ISDN loopback test
The ISDN loopback test is designed to confirm the existence of a
working ISDN line and the proper configuration of certain Netopia
Router parameters. This test is available only on switched ISDN
lines.
Using the first B-channel, the test calls the Netopia Router on the
second B-channel, creating a call loop back to the unit.
To run the ISDN loopback test, select ISDN Switch Loopback Test
in the Statistics, Utilities, Tests screen and press Return to go to
the ISDN Switch Loopback Test screen.
ISDN Switch Loopback Test
Run Test Now
Status: Untested
Select Run Test Now and press Return. The loopback test is
executed immediately.
Note: Make sure neither B-channel is in use before you execute the
loopback test.