2 Hardware Architecture
User's Manual
HT8000-I/HT8000-II/HT8000-VI
64
Beijing Huahuan Electronics Co., Ltd.
Version 1.4(Oct.2019)
Table 2-37
LED functional descriptions of A2GS-NM-P21.P12
LED
Color Descriptions
RUN
Green
System running indication:
Blink: running normally
Off: running abnormally
ALM
Red
Alarm status indication:
On: alarm occurs
Off: no alarm
NOTE
NC interface is reserved.
2.2.29 40/60/80km DCF Card
(B1FN-40/B1FN-60/B1FN-80)
After an optical signal is transmitted over certain distance, the optical
signal pulse is widened because of the positive dispersion accumulated in
the system. This widened shape seriously affects the system transmission
performance. B1FN-40/B1FN-60/B1FN-80 uses the negative dispersion of
the DCF to compensate the positive dispersion of the transmitting fiber, so
that to compress the signal to realize the long-distance communication.
B1FN-40 provides 40km compensation distance; B1FN-60 provides 60km
compensation distance; B1FN-80 provides 80km compensation distance.
B1FN-40/B1FN-60/B1FN-80 has 1 LED, 1 OUT interface and 1 IN
interface. The front panel diagrams are shown in Figure 2-35, the LED is
described in Table 2-38.