Zhone 891630, Справочное руководство системы

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2-36 IMACS System Release 5.1.9 Reference Guide
Model No.
Running Head
Frame Relay Access and Concentration Server Applications
Figure 2-23. Cellular Network Frame Relay Application
2.7.5 Frame Relay Concentration at Hub Sites
In the application shown in Figure 2-24, a corporation which serves a wide geographical area
through multiple branch offices is able to utilize the Frame Relay server’s ability to
consolidate and multiplex multiple NX56/64K circuits into a single high-speed facility. This
significantly reduces its access charges from its service provider for its corporate Frame Relay
network. Typical examples include banks, health care providers, technology parks, etc.
The branch offices typically subscribe to a Frame Relay service with a Committed
Information Rate (CIR) of 56/64K. At the Head Office/Data Center the traffic is typically from
a “farm” of front end processors, routers and servers.
Without an IAD+FRS at the Head Office/Data Center, multiple circuits would occupy
multiple ports in the service provider’s switch and would be tariffed for lower individual
speeds.
With an IAD+FRS, the multiple lower speed circuits are consolidated and groomed into a
single/few high-speed (Nx64K) circuit. Since the marginal access charge of Frame Relay is
lower at higher speeds, due to economies of scale, this could reduce costs.
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4 Channelized DS-1s = 96 DS-0s
56/64kbps
DS-1
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Switch
MDIS
Mobile Switch Office
Cell Site
#96
CellDAX