Product specifications

CDM-710 Broadcast Satellite Modem Revision 11
Introduction MN/CDM710.IOM
1–7
1.3.4 Physical Features
1.3.4.1 Front Panel
Figure 1-5. Front Panel View
Figure 1-5 shows the front panel of the CDM-710 High-Speed Satellite Modem. The front pa
nel
features (from left) Light-Emitting-Diode (LED) indicators; a keypad; and a Vacuum Fluorescent
Display (VFD):
• The eight (8) LEDs indicate, in a summary fashion, the status of the unit.
• The keypad comprises six individual keyswitches. They have a positive ‘click’ action,
which provides tactile feedback. Note that, per the above figure, the initially-released
version featured switches behind a sealed membrane overlay.
The user enters data via the keypad, and messages are displayed on the VFD.
• The VFD is an active display showing two lines of 24 characters each. It produces a blue
light with adjustable brightness. Compared to a Liquid Crystal Display (LCD), the VFD
has greatly superior viewing characteristics and does not suffer problems of viewing
angle or contrast.
The function and behavior of the LED indicators, keypad, and VFD is described in detail in
Chapter 5. FRONT PANEL OPERATION.
LED
Indicators
Keypad
Vacuum Fluorescent
Display (VFD)