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logical design of a star network comprises a number of
point to point connections which communicate via a central
processing unit. Short haul modems are used to extend
the distance between the units and to provide galvanic
isolation. Different interfaces and cable types (e.g.
4-wire and fibre optic cables) can be combined in an
asynchronous star network. Since each unit communicates
with the central processing unit via a separate line,
all other communication is not interrupted in the event
of a single cable failure. Westermoís star network, which
is a polling network, requires intelligent units which
recognise their own addresses. |
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