The context in which Carrier Ethernet services are defined is, therefore, the Service
Provider networks and the several types of services already being delivered over these
TABLE 2.1 Ethernet in the LAN Versus Ethernet in a Service Provide Network (Spanning the MAN and WAN)
Dimension Local Area Network Service Provider Network
Geography/Reach Usually less than 1??“2 km; deployed in
building(s) and small campuses
10??“100 km and longer; deployed in
a metro area or even across distant
metro areas
Service Provider Enterprise (IT group); implemented by
internal IT group.
Service Provider (Carrier typically);
services offered commercially for an
initial and recurring cost
User of service Enterprise Enterprise
Number of end users/points (Scale) In the tens/hundreds Thousands or tens/hundreds of
thousands
Bandwidth 10M/100M/1000M 1M and greater??”up to 10,000M;
usually in granular increments of 1M
Aggregation required
Services offered (scope) Enterprise data applications Voice/ TDM and data connectivity
applications such as Internet Access,
intra-metro connectivity
Delivery of Ethernet services Over coax (CAT 5) and fi ber;
Best effort
Over a host of media, incumbent
transport technologies, and with an
associated service-level agreement
(SLA)
Tolerance to failures (resiliency) Generally reasonable because network
is usually intra-enterprise and over a
smaller physical area so failures can
be addressed relatively quickly
Very low tolerance because failures
usually have a larger impact??”often
on revenues and competitiveness
Manageability Manageability possible with fairly
simple tools given fewer number
of users and applications within a
smaller physical area (typically a
building or campus) and the relatively
higher tolerance to failure issues
Scale and scope of the Service
Provider network in terms of the
number of users and the geographical
footprint introduces signifi cant
complexity necessitating sophisticated
management tools and capabilities
Carrier Ethernet 47
networks.
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