Digital Link DL3800 DS1, User Manual

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5-14 DL3800 DS1 Inverse Multiplexer User Guide—February 1999
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of the Test Menu and then, using the other buttons, go into the Monitor or
the ConÞguration Menus to view the performance information or view and
change the conÞguration of the unit while the test is in progress.
While the test is active, the front panel
TEST
LED is on, reminding the user
that the unit is out of normal service condition. The test is terminated by
pressing the
END TEST button combination at any point in the menus.
When this combination is pressed, the currently active test is canceled and
the front panel display returns to the TEST MENU to the test that was just
terminated.
Network Tests (1 through 8)
Three NETWORK TESTS can be performed through this Menu, a
PAYLOAD (PAYLD) LOOPBACK, a LINE LOOPBACK and a LOCAL
LOOPBACK. To access NETWORK TESTS MENU from the TEST MENU,
press
ENTER when NETWORK TESTS MENU for a particular T1 circuit
(NET 1 through NET 8) appears in the display.
When in the particular NETWORK TEST MENU, pressing the up arrow or
down arrow toggles between the three options, PAYLD, LINE and LOCAL
LOOPBACK.
Payload Loopback
The PAYLOAD LOOPBACK on the DL3800 is used to verify the proper
operation of the T1 network and the DL3800.
To initiate a PAYLOAD LOOPBACK from the DL3800, press ENTER when
PAYLD LOOPBACK appears in the display for the T1 (NET 1 through NET
8) line to be looped back.
When a PAYLOAD LOOPBACK is in operation, a plus sign will appear
after the words PAYLD LOOPBACK in the display.
Payload Loopback +
When the loopback is terminated, the "plus sign" disappears.
To end the loopback, press ENTER again while still in the PAYLD
LOOPBACK MENU.