Black Box IT1000, Руководство пользователя

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30
IT1000 Basic Rate ISDN Tester
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5 INDIVIDUAL TEST DETAILS
5.1 Introduction
This section describes the individual tests which your IT1000 tester can perform in further detail. To
select a test in stand-alone mode, ensure that the test selection indicators are set to the correct value
as in 2.2.3 above
5.2 D Channel Activity Monitor
When the unit is connected to a functioning ISDN line with D Channel active, the ‘Line Active’
LED will automatically illuminate to show that an ISDN line is present.
5.3 D Channel Data Call
This test attempts to make a call to a nominated X.25 host. It first checks for a functioning Layer 2
circuit to the local exchange then attempts to send SAPI 16 traffic over the D Channel.
If this succeeds, the test will then send a request for information over X.25 to the remote host. The
host used is configurable and is set at the factory to query the BT test clock, this can be changed to
any host whose NUA (Network User Address) you have, but if you do this you should note the
factory parameters before changing it.
The test will be considered successful if the remote host returns properly formatted X.25 data over
the D channel.
5.4 B Channel Data Call
This test attempts to make a call to a nominated X.25 host using any available ISDN B channel. It
first checks for a functioning Layer 2 circuit to the local exchange then attempts to call a remote
X.25 PAD.
On receiving a call connect message from the remote PAD, it then attempts to send a request for
information to a nominated remote host.
The test will be considered successful if the remote host returns a properly formatted response over
the B channel.
5.5 Voice Call (outgoing)
When this test is selected, the tester attempts to dial a specified voice number using any available B
channel. The number to be called is programmed by using the IT-Explorer software and is
remembered in the unit even when it is switched off.