User guide

Front Panel Interface 5-15
5
Line Loopback
The network loopback is used to verify the operation of the T1 network
connection (T1 through T8). The network loopback loops the data received
from the T1 network back towards the network. The data is regenerated
prior to being looped back, however, no additional processing of the data
is performed by the DL3800. This minimizes the impact of the DL3800
during this test so that the problems can be isolated.
To initiate a LINE LOOPBACK from the DL3800, press the ENTER button
when LINE LOOPBACK appears in the display.
When a Line Loopback is in operation, a "plus sign" will appear after the
words LINE LOOPBACK in the display as shown below:
Line Loopback +
To end the loopback, press ENTER again while still in the LINE
LOOPBACK MENU. When the loopback is terminated, the plus sign
disappears.
Local Loopback
The local loopback is used to verify the operation of the DTE and
connections. The local loopback loops the data received from the DTE back
towards the DTE at the network interface.
To initiate a LOCAL LOOPBACK from the DL3800, press the ENTER
button when LOCAL LOOPBACK appears in the display.
When a LOCAL LOOPBACK is in operation, a "plus sign" will appear after
the words LOCAL LOOPBACK in the display as shown below:
Local Loopback +
To end the loopback, press ENTER again while still in the LOCAL
LOOPBACK MENU. When the loopback is terminated, the "plus sign"
disappears.
You can cancel a test or loopback from any place in the Menu by pressing
the up arrow and down arrow at the same time. However, this will cancel
all tests and loopbacks currently in progress.
CONFIGURATION MENU
The CONFIGURATION MENU is used to back up the database and to
view and change the unit and Comm Port ConÞguration parameters,
network interface parameters, and DTE interface parameters. The remote
unit conÞguration may also be viewed and changed.