CDM-625 Advanced Satellite Modem Revision 13
Front Panel Operation MN-CDM625
5–4
5.1.3 Vacuum Fluorescent Display (VFD)
The CDM-625 features a Vacuum
Fluorescent Display (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 VCD provides
superior viewing characteristics and does not suffer problems of viewing angle or contrast.
On most menu screens, you will observe a flashing solid block cursor, which blinks at a once-per-
second rate. This indicates the currently selected menu item, digit, or field. Where this solid
block cursor would obscure the item being edited (e.g., a numeric field) the cursor automatically
changes to an underline cursor.
5.1.3.1 Screen Saver
If the operating unit is left displaying
the same screen for weeks at a time,
the VFD could become burnt with this
image. To prevent such burn-in, a
screen saver feature activates after one hour. The screen saver messages loop from right to left
across the screen. The top line of the display shows the user-editable Circuit ID; the bottom line
shows the current status of the modem followed by the message ‘Press any key…’ as shown
here. Press any key to restore the previous screen.
5.1.3.2 Opening Screen
The front panel displays provide the visual means to fully control and monitor operation of the
CDM-625. The first screen to display, after turning the power on, is the read-only opening
screen:
Comtech CDM-625 Advanced Satellite Modem
Ver2.1.0
This screen identifies the modem model, its installed firmware version, and information about
installed hardware options. From any other nested menu, press CLEAR repeatedly to access this
screen.
5.1.3.2.1 Feature Availability/Operation Indicators via the Opening Screen
Comtech CDM-625 Advanced Satellite Modem
TPC,CnC,VFEC,PktP present Ver2.1.0
• TPC/LDPC Codec – If installed, the display also indicates TPC.
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