The
attributes encompassing reliability are, therefore, necessary to provide this assurance.
Most of the solutions provide some degree of service resiliency, except for PON (usually
used for best-effort services). This is not surprising given that this is typically a
prerequisite to be even considered by Service Providers. Some level of path protection
is also generally available in almost all of the solutions discussed.
Restoration meeting or bettering the sub-50 ms benchmark is also available in
most of the solutions, albeit in a few the restoration times are longer. Table 16.4
summarizes the solutions with respect to this attribute.
Quality of Service (QoS) The QoS attribute enables Carrier Ethernet solutions to be
meaningfully employed in a carrier-context; specifically, it allows Service Providers to
offer Ethernet services that can support applications that mandate a stringent level of
performance. The absence of this capability in some of the Carrier Ethernet solutions,
in fact, usually serves as a big detriment for enterprises to move to Carrier Ethernet.
Packet-based solutions such as MPLS have incorporated QoS capabilities by design,
whereas traditional transport solutions have long supported it, albeit not always as
fully.
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