Zhone Technologies Network Device manual Mobile Base Station, Frame Relay DS1s, Frame Switch

Zhone Technologies, Inc. IMACS Product Book, Version 4

56/64Kbps

CellDAX

DS1

Mobile

Base Station

Cell Site

# 96

Mobile Switch Office

T1

4 Channelized

DS1s = 96 DS0s

IMACS

T1

2 Frame Relay DS1s

IMACS

Frame Switch

MDIS

Figure 35—Cellular Network Frame Relay Application

Frame Relay Concentration at Hub Sites

In the application shown in Figure 36, 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 IMACS+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 IMACS+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.

March 2001 Page 86