Abstract
The effectiveness of protection strategies that use a photonic layer and a
synchronous digital hierarchy (SDH) layer is experimentally investigated in an
IP-over-optical overlay model. With SDH-layer protection, the path alarm-indication
signal that reports upstream failures is able to hold the link states of customer
edge (CE) routers and establish interworking operation between the SDH layer and the
IP layer. However, photonic-layer protection requires guard-time setting for CE
routers in order to avoid IP-layer restoration. When we apply a guard time that is
longer than the photonic-layer protection time, interworking operation can be
achieved. On the basis of these experimental results on the fault-recovery
operation, the appropriate guard-time setting for photonic-layer protection is
discussed.
© 2003 Optical Society of America
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