Front Panel Operation; Figure 5. Front Panel Four Character Display And Pushbuttons; Table 7. Four Character Display Modes - ADTRAN HDSL DDM+ HTU-C Installation And Maintenance Practice

HDSL DDM+ Transceiver Unit for Central Office Installation and Maintenance Practice

FRONT PANEL OPERATION

The front panel interface consists of an alphanumeric LED Four Character Display (FCD) and
two pushbuttons,
MODE
through the FCD modes listed in
and other operational conditions. In addition, the FCD is used to reset unit configuration
defaults and control loopbacks. The FCD and front panel pushbuttons are illustrated in
Figure 5.

Figure 5. Front Panel Four Character Display and Pushbuttons

Mode Display
Status STAT
Display Off Blank
View VIEW
Default DFLT
Loopback LPBK
12
and that control the FCD. Pressing the
SELECT,
Table 7. The FCD is used to report the loop margins (dB),

Table 7. Four Character Display Modes

Function
This mode displays HDSL loop margins, for detailed information, refer to
the "Status/Alarm Mode"
This mode results after five minutes of no activity, for detailed
information, refer to the
page 13.
This mode displays current option settings without the ability to change
them, for detailed information, refer to the
practice on page 14.
This mode resets all factory defaults, for detailed information, refer to the
"Default Mode" section of this practice on page 15.
This mode selects and executes HDSL circuit loopbacks, for detailed
information, refer to the
page 15.
section of this practice on page 13.
"Display Off Mode" section of this practice on
"View Mode"
"Loopback Mode" section of this practice on
pushbutton cycles
MODE
section of this
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