For this reason, and because most SONET network element solutions come
from vendors with years of experience delivering reliable products to service providers,
SONET has become synonymous with survivable optical networking. EoS
solutions can leverage the ability of SONET to provide underlying protection for
reliable Carrier Ethernet services,4 while service providers can sell Ethernet over
SONET to their customers using the power of the SONET ???brand??? for reliable,
survivable networks.
?– Quality of service QoS is typically a packet-level function; it comprises the ability
of a packet-based system to assign the right network resources to the right packets
when there is contention for those resources (e.g., when the network is experiencing
congestion due to the statistical nature of packet arrivals). SONET provides a
4 Some have criticized SONET protection and its application to data services because it reserves half
the network bandwidth for protection. However, any service (packet or circuit) that requires dedicated
bandwidth under all network conditions (including link or node failure) must have that amount of
dedicated bandwidth reserved on the protection path.
Pages:
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724