Hytera DMR System Planner
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4.3.4 WAN and LAN
Generally, WAN and LAN together constitute the network topology, for example,
multiple remote sites or the LAN of two sites can be connected via an ISP.
For WAN, its required bandwidth is related to the number of network devices in IP
Multi-site Connect system, that is, the value shall be the sum of required
bandwidth of each network device; for a site, since the communication request of a
repeater will be sent to all other repeaters in the same system, the ISP bandwidth
required for a site is the sum of all other sites’ bandwidth. When a new repeater is
added, all other repeaters would require extra bandwidth.
Similar to WAN, to receive messages from other repeaters, the Master repeater
needs a static IPv4 address, which the other network devices can use to connect
the wide area system. In a LAN, the repeater containing a static IP address is
deemed as the Master repeater by default.
Likewise, the router, NAT or firewall connecting Master repeater must be configured
properly to receive unrequested messages from other repeaters.
For the IP Multi-site Connect network to work over IPv4, the routers in wide area
network must support ”HairPinning” – a function that will send the source address a
message indicating how to reach the destination.
The following figure shows an example of IP Multi-site Connect operating with
WAN and LAN.
Note that the network devices may belong to different wide area systems, for
example, there are multiple dispatching centers.
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