For businesses with ISP connections, or those operating LANs in multiple physical
locations, establishing Ethernet connectivity between LANs allows them to manage
and share network resources economically. Additionally, utilizing Ethernet for their ISP
Figure 10.11 Circuit bonding solution for enterprise
SONET/SDH TRANSPORT NETWORK
Enterprise headquarters Enterprise office
Remote
terminal Remote
terminal
Corporate LAN
Corporate LAN
Remote LAN
(extension of corporate LAN)
Circuit-bonding
equipment
Circuit-bonding
equipment
ADM
ADM
ADM
Figure 10.12 Tenants in an office building receiving service from an ISP
Enterprise Offices
Enterprise #1
10/100/1000 Ethernet
DS1/DS3/OC-3/OC-12 Bonded Circuits
Central Office
ADM Remote Terminal
ISP Router
Circuit Bonding
Equipment
Ethernet Based Internet Access
Enterprise #2
TDM: Circuit Bonding 287
connection provides an economical and scalable solution eliminating the TDM interface
on their router. Service providers are beginning to deploy solutions to meet this need,
but the majority of their existing network is not capable of supporting Ethernet.
Today, all services, regardless of whether they are voice or data, are provided over the
same TDM network.
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