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aurora
Sonata
Hand Held ISDN Tester—User Guide
4-8 427869
Using an external source for the network
clock
Normally, when aurora
Sonata
emulates an NT, it generates the
network clock. However, on a Basic or Primary Rate link you
can take the network clock from an external source.
-1-
Connect a network link into the top connector
for the S or PRI interface module, using the
4-4 cable.
Tip
This is useful, for example, when testing into a PBX which has
more than one network connection. If you have any queries
about this mode of operation, contact the Agilent
Technologies Help Desk.
Testing ISDN links
There are two main types of ISDN link:
• links which use ISDN protocol transactions for call
control. For Basic Rate such links may be either
point-to-point or point-to-multipoint, while for
Primary Rate they are always point-to-point (see the
Introduction to ISDN for details).
• ‘fixed’ links, which do not use protocol support
For guidelines on how to set up aurora
Sonata
to test each type of
link, see Setting the emulation mode in Chapter 3 section 1.
Notes on testing fixed links
A fixed link is a point-to-point link consisting of a single,
dedicated ISDN circuit between a TE and an NT. No ISDN
protocol support is used for call control, so there is no call
setup process.
To test a fixed link, you must set
L2 protocol
(see Setting the
emulation mode in Chapter 3 section 1) to
No D Chan
.
During a fixed link call aurora
Sonata
displays
No D Chan
.