544M or
N ?— 1.544M (up to
45M),
where N is usually
an integer value
Limited
Steps: 1.5M, 45M,
155M, 622M,
1250M, 2.48G, 10G
Highly fl exible
Granular bandwidth in
increments of 1M or less
Scalability Step function Step function Step function
corresponding to
traditional TDM
hierarchy
Granular
Application support Voice and data Data Voice Data
Quality of service
(QoS)
Very good; strong
mechanisms to
ensure QoS
Good Excellent dedicated Initially little to none,
gradually incorporating
new mechanisms
Management Excellent High Very Good Inadequate
Resiliency Excellent Excellent (SONET) High
Cost High High High Low
Innovation Limited Limited Reasonable Continuous
40 Unfortunately the initial assessments on the rate of growth were somewhat exaggerated. ???That [Internet]
traffic was doubling every 90 days??? was bandied about quite authoritatively! [12] and contributed, along with
other factors, to the telecom boom??”and the subsequent bust that followed. But it was indisputable that data
traffic grew significantly.
Ethernet: From LAN to the WAN 27
Service Providers emerged??”the Competitive Local Exchange Carriers (CLECs).
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