Hytera DMR System Planner
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of bandwidth and time delay required by related devices. In addition, a sound
understanding of bandwidth and time delay between two sites is also required,
especially between two distant sites. In general, the time delay of satellite access
across 5 continents is unacceptable, whereas this problem does not exist with cable
communication.
It is necessary to note that a repeater's communication request will be sent to all
other repeaters in the same system. In other words, the bandwidth required by a site
correlates with the sum of repeaters in the system. When a new repeater is added,
all other repeaters would require extra bandwidth.
The
IP Multi-site Connect
network can work with many routers, NAT and firewalls.
It is recommended to install the repeater behind these devices.
Most routers have a useful function -- secure VPN (Virtual Private Network). The
VPN will not pose a burden on the bandwidth but may result in time delay.
To receive unrequested 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. Additionally, the router, NAT or firewall connecting Master repeater
must be configured properly as well.
The following figure shows an example of IP Multi-site Connect operating with WAN.
Note that the network devices may belong to different wide area systems, for
example, there are multiple dispatching centers.
IP Multi-site
Connect Device
Network
Router
Router
Router
Router
Router
Router
WAN
IP Multi-site
Connect Device
IP Multi-site
Connect Device
IP Multi-site
Connect Device
IP Multi-site
Connect Device
IP Multi-site
Connect Device
Figure 4.3.3-1: IP Multi-site Connect Network Operating with WAN
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