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aurora
Sonata
Hand Held ISDN Tester—User Guide
4-6 427869
Simulation on the U interface
On the U interface, you can use aurora
Sonata
to emulate
Terminal Equipment (a TE) or a Line Termination (LT) device.
Emulating a TE on the U interface
When aurora Sonata emulates a TE on the U interface, it operates
as both the NT1 and the TE. You would use this:
• to check the interface during line installation
• to find out whether a suspected fault is on the
U interface side of the NT
aurora
Sonata
can emulate a TE on the U interface using 2B1Q,
4B3T or Up0 line coding, when the appropriate module is
fitted.
Emulating an LT on the U interface
You would use aurora
Sonata
to emulate an LT:
• to test towards the NT (check the local loop)
• to test the line from the exchange end
aurora
Sonata
can emulate an LT on the U interface using 2B1Q,
4B3T or Up0 line coding, when the appropriate modules are
fitted.
‘NT replacement’ test
When your aurora
Sonata
is fitted with one S and one U interface
module, you can disconnect the NT and replace it with
aurora
Sonata . This allows you to test whether the NT is faulty.