User guide

Front Panel Interface 5-13
5
DTE TESTS
Only one loopback can be initiated through the DTE TESTS Menu, a bi-
directional DTE/NET Loopback.
To access the DTE TESTS Menu from the TEST Menu, press ENTER when
DTE TESTS appears in the display.
When in the DTE TEST Menu, pressing ENTER accesses the DTE/NET
Loopback.
DTE/NET Loopback
The DTE/NET LOOPBACK is a bi-directional loopback that loops the
received DTE signal back to the DTE and the signal from the T1 Main
Board back towards the T1 Main Board. This loopback is used to verify the
operation of the DTE and associated cabling, the DTE Board, and the link
between the DTE Board and the T1 Main Board.
To initiate a DTE/NET LOOP from the DL3800 front panel, press ENTER
when DTE/NET LOOP appears in the display.
When a DTE/DTE LOOP is in operation, a "plus sign" will appear after
DTE/NET LOOP in the display:
DTE/Net Loop +
To end the loopback, press ENTER again while still in the DTE/NET
LOOPBACK menu.
To cancel a test or loopback from any place in the Menu, press the END
TEST button combination. However, this will cancel all tests and
loopbacks currently in progress.
Only one test can be performed at a time. To start a new test, the previous
test must Þrst be terminated.
While a test is active and the user is in the Test Menu, the up arrow and the
down arrow buttons are disabled, and the user can only view the name of
the test that is currently active. The user can use the EXIT button to go out
NOTE: A menu item will appear only for those T1 network interfaces.
installed.