Comtech EF Data SLM-5650A - Manual (Page 86)

SLM-5650A Satellite Modem Revision 8
Front Panel Operation MN-SLM5650A
5–4
5.1.3 Vacuum Fluorescent Display (VFD)
The SLM-5650A features a Vacuum Fluorescent
Display (VFD). The VFD is an active display showing
two lines of 40 characters each. It produces a blue
light, the brightness of which can be controlled by the
User. Compared to a Liquid Crystal Display (LCD), it has superior viewing characteristics and
does not suffer problems of viewing angle or contrast.
On most menu screens, a flashing solid block cursor blinks at a once-per-second rate. This
indicates the currently selected item, digit, or field. Where it might obscure the item being edited
(e.g., a numeric field), the solid block 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 15 minutes.
The screen saver messages loop from right to left across the screen. Sandwiched between the
product display message “ Comtech EF Data SLM-5650A Modem” and the user prompt
“ Press any key to continue”, the following operating statistics are provided:
Modem Status Code Description
01 Circuit Identification
02 Demodulator receive frequency offset from the nominal
03 Buffer fill status (%)
04 Receive signal level (dBm)
05 Estimated Eb/No
06 Estimated Corrected Bit Error Rate
07 Bit Error Rate reported by the internal Bit Error Rate Test set