Abstract
One of the key elements in building a time-division-multiplexed (TDM)
switch is the time slot interchange (TSI). Given the current optical switching
and buffer technologies, TSI-based TDM architectures have many implementation
drawbacks, including severe signal attenuation. Some studies showed that some
space-time equivalence diagrams can be converted into a delay-unit-based
(TSI-free) TDM. This type of architecture is attractive for optical TDM switches,
but the techniques discussed in those studies are for rearrangeable switches.
Many applications require nonblocking switches where adding a new connection
(or a flow) will not cause rearrangement of existing connections. In this
paper, we present the design principle for building strictly nonblocking
delay-unit-based (TSI-free) optical TDM switches.
© 2007 IEEE
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