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參數(shù)資料
| 型號： | MVTX2804AG |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | 8-Port 1000 Mbps Ethernet Distributed Switch |
| 中文描述： | DATACOM, LAN SWITCHING CIRCUIT, PBGA596 |
| 封裝： | 40 X 40 MM, 2.33 MM HEIGHT, MS-034, HSBGA-596 |
| 文件頁數(shù)： | 29/174頁 |
| 文件大小： | 2249K |
| 代理商： | MVTX2804AG |
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MVTX2804
Data Sheet
29
Zarlink Semiconductor Inc.
In our model, it is possible that a class of traffic may attempt to monopolize system resources by sending data
at a rate in excess of the contractually assured bandwidth for that class. A well-behaved class offers traffic at a
rate no greater than the agreed-upon rate. By contrast, a misbehaving class offers traffic that exceeds the
agreed-upon rate. A misbehaving class is formed from an aggregation of misbehaving microflows. To achieve
high link utilization, a misbehaving class is allowed to use any idle bandwidth. However, the quality of service
(QoS) received by well-behaved classes must never suffer.
As Table 1 illustrates, each traffic class may have its own distinct properties and applications. As shown,
classes may receive bandwidth assurances or latency bounds. In the example, P7, the highest transmission
class, requires that all frames be transmitted within 0.2 ms, and receives 30% of the 1 Gbps of bandwidth at that
port.
Best-effort (P1-P0) traffic forms a lower tier of service that only receives bandwidth when none of the other
classes have any traffic to offer.
In addition, each transmission class has two subclasses, high-drop and low-drop. Well-behaved users should
not lose packets. But poorly behaved users - users who send data at too high a rate - will encounter frame loss,
and the first to be discarded will be high-drop. Of course, if this is insufficient to resolve the congestion,
eventually some low-drop frames are dropped as well.
Table 1 shows that different types of applications may be placed in different boxes in the traffic table. For
example, web search may fit into the category of high-loss, high-latency-tolerant traffic, whereas VoIP fits into
the category of low-loss, low-latency traffic.
Class
Example
Assured
Bandwidth
(user defined)
Low Drop Subclass
(If class is
oversubscribed, these
packets are the last to be
dropped.)
High Drop Subclass
(If class is oversubscribed,
these packets are the first
to be dropped.)
Highest transmission
priorities, P7
Latency < 200
μ
s
Highest transmission
priorities, P6
Latency < 200
μ
s
Middle transmission
priorities, P5
Latency < 400
μ
s
Middle transmission
priorities, P4
Latency < 800
μ
s
Low transmission
priorities, P3
Latency < 1600
μ
s
Low transmission
priorities, P2
Latency < 3200
μ
s
Best effort, P1-P0
TOTAL
300 Mbps
Sample application:
control information
200 Mbps
Sample applications:
phone calls; circuit
emulation
Sample application:
interactive activities
Sample application:
training video; other multimedia
125 Mbps
Sample application:
non-critical interactive activities
250 Mbps
Sample application:
web business
Sample application:
non-critical interactive activities
80 Mbps
Sample application:
file backups
45 Mbps
Sample application:
email
Sample application:
web research
-
Sample application:
casual web browsing
1 Gbps
Table 1 - Two-dimensional World Traffic
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