Disadvantages of sonet?
The disadvantages of using SONET/ SDH in the metro include: *
Fixed circuits. SONET/SDH provisions point-to-point circuits
between ring nodes. Each circuit is allocated a fixed amount of
bandwidth that is wasted when not used. That fixed allocation puts
a limit on the maximum burst traffic data transfer rate between end
points. This is a disadvantage for data traffic, which is
inherently bursty. * Waste of bandwidth for meshing. Provisioning
the circuits necessary to create a logical mesh over a SONET ring
is not only difficult, but also results in an inefficient use of
ring bandwidth. As the amount of data traffic that stays within
metro networks is increasing, a fully meshed network that is easy
to deploy, maintain and upgrade is becoming an important
requirement. * Multieast traffic. On a SONET/SDH ring, multicast
traffic requires each source to allocate a separate circuit for
each destination. A separate copy of the packet is sent to each
destination. The result is multiple copies of multicast packets
traveling around the ring, wasting bandwidth.