This section evaluates the economic impact of circuit bonding from both the enterprise
perspective and the carrier perspective. It is important to point out that the economic
impact of any technical solution must be equally applicable to end users as well
as to carriers for it to be acceptable. In this case, the economic impact of circuit bonding
will be applicable to both parties.
In the example shown in Table 10.1, enterprise headquarters and the data center
have fiber access. None of the remote sites are served by fiber, and they are being
served by copper pairs only. All data traffic is considered to be mission-critical, and
the enterprise requires a strict SLA to guarantee the quality and security of the
connections.
TDM: Circuit Bonding 295
Table 10.2 illustrates the carrier??™s perspective on how services can be provided
today.
In this example, the two 10 Mbps Ethernet circuits cannot be served without the
expensive construction of fiber to the two remote sites. Optical equipment, such as
SONET or SDH MSPPs, will also be required. The following table shows the inefficiency
of bandwidth utilization for the present solution and the inefficient use of bandwidth
From To Application Bandwidth Format
Headquarters Remote site A Voice 8 POTS lines TDM
Headquarters Remote site B Voice 8 POTS lines TDM
Headquarters Data center Voice 6 POTS lines TDM
Headquarters Remote site A LAN 10 Mbps Ethernet
Headquarters Remote site B LAN 10 Mbps Ethernet
Headquarters Data center Data 500 Mbps GbE Ethernet
Data center ISP Internet access 10 Mbps Ethernet
TABLE 10.
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