Take A Closer Look; The Front Panel - Black Box IT1000 Manual

2.3 Take a closer look.

Now that you have the tester out of the box, take a closer look so that you are familiar with the
various connectors and indicators.
2.3.1

The front panel

The front panel of the tester features 8 LED indicators that will illuminate steady or flashing when
the unit is in use to indicate the status of various tests which the unit can perform.
The indicator labelled Power will illuminate steady red when the unit is switched on by pressing
AND HOLDING the red button marked ON (auto-off).
Tests are selected by repeatedly pressing the green button marked MODE / RUN until the pattern of
lights on the indicators matches the required test marked on the unit's label. Further details on this
function can be found in Section 2.2.
The indicator marked Line Active will illuminate when the tester has been correctly attached to an
ISDN line and a physical (Layer 1) connection has been established between the tester and the local
exchange.
The next group of three indicators labelled Call Control L2, D-X.25 L2 and X.25 Call L3 reflect
the status of the SAPI 0 and SAPI 16 traffic between the tester and the exchange and will illuminate
as the tests progress to indicate that the tester has established a connection at this level.
The B1 or B2 indicators will illuminate steady when the respective B-channel is active. If data is
being transmitted or received over any of these channels the appropriate indicator will flash. These
indicators together with the Pass / Fail indicator are also used to select the required test (see below).
Figure 1. IT1000 front panel
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IT1000 Basic Rate ISDN Tester
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