In effect, the application requires the use of
the service provider??™s infrastructure to remove the Ethernet distance limitation. This
creates a virtual direct connection between Ethernet ports, with TDM-like Quality
of Service (QoS) and service assurance and management capabilities. Circuit bonding
is able to transport Ethernet over new or existing infrastructure by augmenting
the transport network, allowing the interconnection of devices with Ethernet ports as
though they were physically next to each other, regardless of their true location. Except
for the transport delay caused by the added distance and the appearance of PAUSE
frames, the distance extension is undetectable by the interconnected devices. The circuit-
bonding solution for the case of an enterprise connecting a LAN at one location to
its main corporate LAN is shown in Figure 10.11. Utilizing circuit bonding, this connection
is made over the existing carrier infrastructure with any number of DS1s, DS3s,
OC-3s, or OC-12s required to achieve the desired bandwidth.
Figure 10.12 shows an example where tenants in an office building are receiving
service from an ISP.
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