1, the composition of the receiver
AIS ReceiversIt is composed of AIS receiver, serial server, AC/DC power supply, antenna 2.2 meters (including feeder), network cable and so on. WhichAIS ReceiversAnd serial server as the core module encapsulated in a chassis.
2. Principle of Receiver
AIS ReceiversReceive the signal sent by the platform AIS and parse the data through the serial port output to the serial port server. Serial server is a small embedded network device, it can convert the data received through the serial port into a standard network protocol, sent to the pre-set server.
3. Receiver radiation
The AIS receiver itself is simply a receiver, with no AIS emitting. The entire receiver also does not have any RF emitting devices. There are no technical defects that violate laws, regulations or harm to the human body.
4, receiver power supply
The receiver uses 220V power supply, the entire receiver power consumption is less than 1W, the power consumption is minimal.
5. Receiver Bandwidth
The baud rate of the serial output of the AIS receiver is 38400bps, so the maximum theoretical value of the receiver consuming bandwidth is 3.84K. This is probably equivalent to more than 3000 ships appearing in a receiver coverage at the same time (the receiver has a normal coverage radius of 50Km). This is, in fact, completely impossible. Typically, the receiver consumes less than 0.1k of bandwidth. At the same time, it is important to note that the bandwidth consumed by the receiver is the uplink bandwidth of the entire network, which has little impact on the daily office of the Enterprise, such as downloading or accessing the website.
6. Network security
The AIS receiver requires the user to assign it a LAN IP address. This is because as a network device to run within a network, it is necessary to have a corresponding IP address, just as many companies use the network printer, to work properly, it is necessary to obtain an IP address.
The AIS Receiver uses UDP mode to send data to the ship network server. UDP Communication is a non-reliable one-way communication in which the server does not send any data to the receiver. Therefore, AIS receivers do not pose any threat to other computers and networks on the user's LAN. This can be confirmed by simple network monitoring.
In addition, an assessment that is in line with popular experience can attest to the fact that the AIS receiver is so small that it is simply impossible for an embedded serial port device to perform work that threatens the user's network security. At the same time, the positioning, operation and profit model of the ship network are very clear, the ship network is not necessary, less likely to take such a large legal risk to engage in their own meaning of illegal acts.
7. Network security
Long-term stable working environment; Office space is not far from the port, high and good view; there is a stable power supply and network environment; If the installation of outdoor antennas is allowed to be more effective (2.2 meters). In addition, you are occasionally required to take simple care of your equipment.
