HP 200 Series Services And Applications page 41

Alternatively, many businesses, such as banking, financial services and
insurance, require more than a single LAN at the remote office, as shown in
figure 2. And there may be legacy devices there, such as IBM terminal
controllers or automated teller machines using X.25 or SDLC, performing
mission-critical functions, that must also be included in a particular branch
networking solution. For additional reliability in the event of link failures,
dial backup may be a consideration.
Clearly, branch office communication requirements vary. What doesn't vary
is the need for a cost-effective solution that meets the networking needs of
the business, and that is as simple as possible to administer.
Branch Routing Requirements
To develop cost-effective solutions for branch office networks, network
designers must determine the basic communications requirements of the
applications for which the network is being designed, including the
underlying protocols and the relative priorities of applications based on
mission criticality. Next, but more importantly, designers must understand
the factors that affect the long-term cost of ownership of a network to keep
costs to a minimum. HP's strategy is to minimize the costs associated with
implementing and managing branch office networks. The major areas of
focus include:
Controlling WAN Costs
Controlling Administration Costs
Controlling and Protecting Equipment Investments
Branch Office Routing
1-37