參數(shù)資料
型號: PM73488
廠商: PMC-SIERRA INC
元件分類: 數(shù)字傳輸電路
英文描述: 5 Gbit/s ATM Switch Fabric Element
中文描述: ATM SWITCHING CIRCUIT, PBGA596
封裝: EPBGA-596
文件頁數(shù): 35/135頁
文件大小: 1735K
代理商: PM73488
PMC-Sierra, Inc.
PM73488 QSE
L
PMC-980616
Issue 3
5 Gbit/s ATMSwitch Fabric Element
Released
Datasheet
37
The chance for internal collisions increases as the network load increases, and the exact behavior varies with network
topology. An example of this behavior is shown in Figure 25 and the SF is inferred from the limiting case where the
network is fully loaded.
Given this notion of SF, “how much faster is fast enough” Theoretical models and simulations can answer that ques-
tion. Given that the switch fabric can be run at a certain clock rate relative to the buffering logic, we can know which
networks to choose to prevent the network from becoming a bottleneck.
Table 2, Table 3 show all of the 1-, 3-stage network topologies requiring an SF of less than 1.6, which is the maxi-
Figure 25. Definition of the Speedup Factor
Figure 26. How to Use the SF to Select Favorable Networks
1
P
A
= Probability
of cell acceptance
Limiting case,
where the Load = 1,
SF = 1/
P
A
0
1
P
A
Load
Network Topology
2.0
160 Gbps
Network Size
Speedup
Factor
(SF)
Fabric Rate
622 Mbps
1.0
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