Furuno BB FAR28x7 - Manual (Page 26)

FURUNO
FAR-21x7(-BB)/28x7 SERIES
SP - 4
E3519S01L-M
8. OPTIONAL EQUIPMENT
SWITCHING HUB HUB-100
1. Access Format CSMA/CD
2. Switching Format Store and Forward
3. Transmission Speed Half-duplex: 10Mbps/100Mbps
Full-duplex: 20Mbps/200Mbps
4. Necessary Cabling 10BASE-T: Category 3 or higher STP cable
100 BASE-TX: Category 5 or higher STP cable
5. Max. Cable Length 100 m
6. Ports 8 ports
- All ports auto-MDIX compliant (straight or cross cable,
automatic recognition)
- All ports EMC compliant (STP cable port)
- All ports equipped with 3 LED injectors
(Link/Act, Full-duplex/Collision, 100Mbps/10Mbps)
7. Buffer Memory SRAM buffer
8. MAC Address Table 1024
9. Dimensions and Mass
Dimensions 47(H)x270(W)x1458(D) (mm) includes fixing screws
Mass Less than 1.6 kg
10. Environmental Conditions
Ambient Temperature -15 to +55°C
Relative Humidity
95% (at 40°C)
EMC IEC 60945
Waterproofing IPX0 (IEC 60529)
11. Power and Power Consumption
Power 100-230 VAC
Power Consumption 100mA/100 VAC
12. Coating and Color N3.0
Precautions for high speed targets
Assume your ship is making 40 kt and a target ship is approaching at 40 kt right toward you. Then
the relative speed is 80 kt. With the antenna rotating at 42 rpm, the target blip appears jumping to a
new location 59 m nearer. This jump corresponds to 19 mm on the display using the 0.25 nm range
scale. On such a short range you may lose the track of a target in the midst of sea clutter, random
noise or other targets. Use one step larger range scale.
ARPA can fail to track a target when the relative speed exceeds 100 kt.