Physical Features; Front Panel; Rear Panel; Figure 1-3. Cdm-750 Front Panel View - Comtech EF Data CDM-750 Installation And Operation Manual

CDM-750 Advanced High-Speed Trunking Modem
Introduction
1.3.4

Physical Features

1.3.4.1

Front Panel

Figure 1-3 shows the front panel of the CDM-750 High Speed Trunking Modem. The front panel
features (from left) eight Light-Emitting-Diode (LED) indicators; a six-button keypad; and a
Vacuum Fluorescent Display (VFD):
•
The LEDs indicate, in a summary fashion, the status of the unit.
•
The keypad comprises six individual keyswitches. The switches provide a positive 'click'
action for tactile feedback. The user enters data via the keypad, and messages are
displayed on the VFD.
•
The VFD is an active display showing two lines of 40 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 are described in detail in
Chapter 5. FRONT PANEL OPERATION.
1.3.4.2

Rear Panel

Figure 1-4 shows the rear panel of the CDM-750 High Speed Trunking Modem. External cables
are attached to connectors provided on the modem rear panel. Each connector is described in
detail in Chapter 3. REAR PANEL CONNECTORS

Figure 1-3. CDM-750 Front Panel View

Figure 1-4. CDM-750 Rear Panel Views

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