ft636 (14.10.2013)
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Kompetent für Elektroniksysteme
ft636 (14.10.2013)
- 35 -
Kompetent für Elektroniksysteme
In this case the installation is more complex, as you have to take the DSL router into consideration
in this configuration.
The router mainly has two functions. One is to set up the connection to the DSL provider. The other
function is to receive data from the local IP Interface and to transmit the data via internet to the
remote location. Here the reverse happens, the router receives the data from the internet and then
has to transfer the data to the IP Interface in its network.
The underlying process is called NAT (Network Address Translation) and the necessary settings
will be briefly explained here.
The router has two network connections. One to the local network, the other to the splitter/DSL pro-
vider. Each of the connections has on own (different) IP address.
The local IP address is freely selectable and usually is preallocated at 192.168.0.1 (net mask
255.255.255.0). The IP address and net mask to the DSL provider can also be allocated by the
provider (set IP address). For example:
DSL router
Local network
Router:
192.168.0.1
Net mask
255.255.255.0
IP Interface 192.168.0.2
DSL provider
84.171.31.100
DSL router
Local network
Router:
192.168.0.1
Net mask
255.255.255.0
IP Interface 192.168.0.2
DSL provider
217.88.202.39
Control head unit side
Control head unit side
It is noticeable that in both local networks the same IP addresses are assigned internally. This
works in this case because the local networks are concealed from the internet by their router. Only
the routers but not the local network behind it can be contacted from the internet respectively from
the remote location. Nevertheless to be able to reach a device in the local network the ports, which
are adjusted in the configuration web interface, are needed.
This means that if the IP Interface of the control head side transmits AF data to the two-way radio
side this is done as standard on port 10000. These data are sent to the address 217.88.202.39.
This router now has to „know“ that the incoming data with the port number 10000 have to be for-
warded to the IP Interface with the address 192.168.0.2 in the internal local network.
Reversely this process works the same. The IP Interface of the two-way radio side transmits its AF
data to the IP address 84.171.31.100 on port 10000 and the DSL router of the control head unit
side forwards the data to the IP Interface with the address 192.168.0.2.
For this to work each of the two routers has to have at least the following entries in its settings un-
der portforwarding/IP masquerading
Port
IP address
10000
192.168.0.2 for protocol UDP or for all protocols
10001
192.168.0.2 for protocol TCP or for all protocols
perhaps also
80
192.168.0.2 for protocol TCP or for all protocols
With the last setting the configuration menu of the remote location can also be contacted.
This means that a PC on, for example, the control head unit side can also configurate the IP
Interface of the two-way radio side. But every other PC within the internet also has access to the
configuration menu. Therefore it is absolutely necessary to set up a password (on the IP Interface,
maybe attach the password to the device, maybe change port, for example 9999).
Configuration of the FT636 IP Interfaces
control head unit side
two-way radio side
Local IP address
192.168.0.2
192.168.0.2
Target IP address
217.88.202.39
84.171.31.100
Net mask
255.255.255.0
255.255.255.0
Gateway
192.168.0.1
192.168.0.1
Summary of Contents for FT 636
Page 1: ...IP Interface FT 636...
