User`s guide

Diagnosing and Troubleshooting the DL3100 6-7
6
DTE Loopback
To initiate a DTE loopback from the front panel, press ENTR when DTE
Loopback appears in the display.
To end the loopback, press ENTR again while still in the DTE Loopback
Menu.
Running HSDB/HVDB Tests
You can also run an HSDB/HVDB Net/DTE Loopback from the front
panel. To select the desired HSDB/HVDB on which to run the loopback,
press ENTR when TESTS appears in the display. Cycle through the Test
menus, using the up or down arrows, until the desired HSDB or HVDB (1,
2 or 3) appears in the display.
To run a Net/DTE Loopback from the front panel, press ENTR from the
HSDB/HVDB (1, 2, 3) Tests menu, when Net/DTE Loopback appears in
the display.
To end the loopback, press ENTR again while still in the Net/DTE
Loopback Menu.
Running a Lamp Test
To verify that all the front panel LED lamps are working, you can run a
Lamp Test.
To run a Lamp Test, press the STAT and ENTR buttons simultaneously. All
the LEDs on the front panel should light.
If any LEDs do not light, call Digital Link Customer Support at (408) 745-
4200.
For a description of front panel LEDs, see Appendix A, ÒDL3100 Technical
SpeciÞcations.Ó
Troubleshooting the DL3100
This section describes problems you may encounter on the DL3100 and
suggests ways you can troubleshoot them.