Furuno WR2120, Руководство по установке

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B. COMMUNICATION NETWORK
Radar needs an internet connection to provide remote maintenance service, main operation, and
transfer of collected observation data.
Recommendation of using network is the fiber optical or any faster network for transferring the weather
observation data to the data center server or office. If the radar location does not have access to any
fast network (up/download minimum 8 Mbps constantly) but can connect to a wireless network then
use the internet just for remote operation and save the data to an external HDD. A 6TB HDD can save
up to 6 months of data depending on observation settings without requiring network transfer.
In addition there are ISP’s (Internet Service Provider) that may make a separate contract to provide
internet access with a suitable communication network (DSL, wireless, fiber optic network, etc.).
A LAN (Local Area Network) setting must be made for using internet access on DPU. First it requires
an IP (Internet Protocol) address setup in DPU.
An IP address is basically a numerical form address
that identifies the location of DPU device. This is similar to a home address. It is 4 sets of numbers
between 0 and 255 (these represent 8 bits or 8 ones and zeros).
In order for a device to send information on a local area network when connected to the same switch it
needs a "private" IP address. These usually fall within the 192.168.X.X or 10.X.X.X realm. X represents
a number between 0 and 255.
Once it reaches the Internet via a router it needs to have a "unique" IP address called a "public" IP.
This is given by an Internet Service Provider. Every computer has its own unique number which cannot
be duplicated on the Internet. Any traffic for this IP address will be routed to it.
Computers need their own numbers. However there is no way to remember the IP of all websites. To
help DNS was created. DNS is the Domain Name System and it translates the web address into an
actual "public" IP. It can be displayed by using the command prompt (start > run > type cmd.exe) and
type “ping” for the web address. At first there is a pause while DNS translates the IP and then it will
display the ping as the unique IP address number formatted as xxx.xxx.xxx.xxx which is specific t
o the
web
address’s web serv er.
- Public IP: Also referred to as “Global IP”, are unique IP address assigned to a computing device
to allow direct access over the internet. A web server, email server, and any server device
directly accessible from the internet are candidates for a public IP address.
On the other hand, a Static IP address will be fixed which will never change. There are also
dynamic IP’s (the IP address can change from time to time) in which a service provider will have
set of public IP.s and will allocate that set of IP addresses to the computer in network
dynamically.
- Private IP: It can be used by those on the same network. It's a unique identifier for all the devices
behind a router or other device that serves out IP addresses
IP address use 4 blocks that break in to 2. First 2 blocks are called “Network part”, and the other 2
blocks are called “Host part”. The numbers are converted from Binary to Decimal.
Network Part: It specifies the unique number assigned to a network. It also identifies the class of
network assigned. It takes up two bytes of the IPv4 address.
Host Part: This is the part of the IPv4 address that is assigned to each host. It uniquely identifies
the machine on a network.
[ Note: Each host on a network, the network part of the address will be the same, but the host part
must be different]
System uses IPv4: 192.168.210. 200 (This is the fixed address for the SPU)
The DPU system is using IPv4: 192.168.210.55 and it is using the private address inside LAN.
Class Start End
Subnet
mask
No. of
addresses
A 10.0.0.0 10.255.255.255 255.0.0.0 16,777,216
B 172.16.0.0 172.1.255.255 255.240.0.0 1,048,576
C 192.168.0.0 192.168.255.255 255.255.0.0 65,536
Network part Host part