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2-2
Publication 1756-TD008A-EN-P - August 2002
Star Topology
In the SynchLink star topology, a hub is placed in the physical center
of the link. The hub acts as a multi-port repeater that contains one
receive port and up to 16 transmit ports. The master node transmitter
is connected to the hub receive port.
Nodes are connected to the hub (via direct, dedicated lines) like
points on a star. Each of the 16 transmit ports on the hub can be
connected to a single node, including one other layer of hubs, as
shown in Figure 2.1.
Figure 2.1
SynchLink
End Node
Hub
End Node
In this topology, the master node transmitter and end node receivers
are not physically connected. Instead, messages are transmitted by the
master node to the hub and then are retransmitted by the hub to all
end nodes.
The star topology supports up to 2 layers of hubs with up to 16 end
nodes connected to each hub. A maximum of 257 SynchLink nodes
(including the master node) can be connected in this topology.
The advantages to using the star topology are:
· Cabling is easier to install and maintain.
· If a node fails, is powered down, or disconnected from the hub,
it is the only node affected, unless it is the master node.
· Faults are easier to locate and isolate.
The disadvantages to using the star topology are:
· A hub is a single-point of failure.
· Data cannot be passed from slave to slave.
For more information on the configurations available in the star
topology, see page 4-6.
Master Node
Hub
End Node
End Node
Hub
End Node
End Node
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