User's Manual

pulsAR radio Operator’s Manual
2-5
LAN
LAN
LAN
LANLAN
1
2345
Figure 2.2 - Linear Network Topology
You can easily implement a Linear Network as a subset of the Tree topology: configure the leftmost
radio as a root and all the radios in the network as a branch. Install each radio with two directional
antennas pointing at their two neighbors.
2.2 Roaming
With the roaming option, a remote or leaf radio can be configured with up to six different receive
channels (see command rf-1-setup). With this capability you can deploy multiple access points in a
region where a group of mobile radios will move around. Mobile radios attach to the network
through any of the access points and automatically switch to a new one whenever the need arises.
This capability is ideal for communications between a control center and vehicles, where the vehicles
must move beyond the range of a single hub radio.
All the access points are typically connected, through a backbone network, back to a central site.
This backbone network can be wired or wireless. You can use the tree topology and have each
branch and root serve both as access points and backbone nodes to bring the traffic back to the central
site (see figure).
The overall system supports the following features:
1. Mobile nodes automatically attach to the strongest access point.
2. As a mobile unit moves and the link to its parent fades, the mobile radio changes autonomously to
attach to a stronger parent.
3. Connectivity to a central site, through a backbone network, is maintained when a mobile changes
parent. Packet routing is switched over autonomously throughout the network so that packets are
correctly routed immediately after the mobile radio changes the access point.
4. Using the Tree topology you can use the fixed nodes in the tree (root and branches) to provide the
backbone network. Those same radios can also be the access points to the mobile leaf nodes.
This approach depicted in Figure 2.3.