User's Manual

WIRELESS NETWORK DESIGN
Point-to-Point Topology
2-2 P-Com DataMetro II
2
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In a packet-based point-to-point topology, two nodes are linked
directly. The most common application for this topology would
be the interconnection of two LANs. In Figure 2-1, the LANs are
connected via a pair of DataMetro II routers.
Figure 2-1 Point-to-Point Topology
The range and interference immunity that can be achieved with
packet-based point-to-point topology is maximized by the use of
highly directional antennas on both sides of the link.
DataMetro II applies native modification of the CSMA/CA
protocol for the point-to-point topology. Each node sends its
frame immediately after receiving a frame, in which case the
delay value is equal to zero. The node that sent the frame will
wait for a reply. If there is no reply, it will send the next frame
using the standard CSMA/CA protocol.
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In peer-to-peer topology (unique to packet-based networks),
there are three or more nodes, any one of which can communicate
directly with any other node. Since each node has direct access to
every other node, the time delay for transferring data between
nodes is the least for this type of topology, unless WAN traffic is
very high. However, this also implies that each node must have a
clear communication path to every other node, that is, there must
be clear line of sight.
An example of a three node peer-to-peer topology is shown in
Figure 2-2 on page 2-3.
DATAMETRO II DATAMETRO II
Ethernet Ethernet