User's Manual

SPEEDLAN 9000 Series Installation and Operation User Guide
Introduction 1-11
SPEEDLAN’s NLOS Pico Cell Architecture
Each SPEEDLAN 9101 or SPEEDLAN 9102 in a NLOS pico cell can communicate up to a 1/2 mile
with its neighboring unit/router.
SPEEDLAN 9000 Mesh Protocol's Core Components
SPEEDLAN 9000 Mesh protocol includes three central components:
Neighbor Discovery
Neighbor discovery occurs when each unit/router sends a broadcast "hello" message to determine
which units/routers are linked to the network. ("Hello" messages are much smaller than other
protocol messages, which conserves bandwidth on the network.) These units/routers then send back
a message to the originating source via the most efficient network path. These messages are formed
containing only the basic information needed to educate the routers, as to which neighbor belongs
to whom.
Topology Updates
Initial neighbor discovery, caused by adding a new or removing an expired unit/router, precipitates a
topology change to all other routers so that their routing tables can be updated. Once established
on the network, "hello" messages are confined to changes in a router or its neighboring status. These
messages will keep all routing tables current: keeping track of connections. This process helps to
maintain an efficient network.
Each link = 1/2 mile.