User guide

Terminal Interface 4-37
4
Figure 4-17 is an example of the TESTS MENU. The individual loopbacks
and operation of the menu are described below in the text following the
menu.
Figure 4-17 TESTS MENU
To initiate a test, use the CURSOR keys to move the highlight bar to
DTE/NETWORK LOOPBACK or a PAYLOAD or LINE LOOPBACK on a selected port.
Use the space bar to toggle between OFF and ON until ON appears in the
display. When that selection appears in the display, move the highlight bar
to CONFIRM, and press the Enter key. To cancel a test that is running, move
the highlight bar to DTE/NETWORK LOOPBACK. Use the space bar to toggle
between the options until OFF appears in the display. Move the highlight
bar to CONFIRM, and press the Enter key.
DTE/Network Loopback
The DTE/NETWORK LOOPBACK is a bi-directional loopback that loops
the received DTE signal back to the DTE and the signal from the T1
processor back towards the T1 network. This loopback is used to verify the
operation of the DTE and associated cabling.