Maintenance). In addition, the highest level status
message appears on the front panel automatically if no
front panel action has occurred at the DSU/CSU for the
past five minutes.

The LCD also lists commands, configuration options,

and test results. In most cases, the top line shows the
command or option name and default value, while the
second line displays options and responses. When a
response is required, select from the options displayed
directly above the Function keys (F1, F2, F3); make your
choice by pressing the corresponding Function key.

Keypad

The 7-button keypad (Figure 3-3) enables you to

navigate through the menu tree and select choices
presented on the second line of the LCD.

Figure 3-3. Keypad

Use the

key to move up the menu.

Use the

key to exit any part of the menu in which

you may be operating. You immediately return to the
top-level menu screen shown on the front panel menu (see
Appendix A,

Front Panel Menu

Use the Function (F1, F2, F3) keys to make selections

from the choices presented on the second line of the LCD.
When this line presents choices, it is generally divided
into three sections, each displayed directly above one of
the Function keys. When your choice appears above one
of the Function keys, press that key to select that choice.