參數(shù)資料
型號(hào)： MVTX2603AG
廠商： ZARLINK SEMICONDUCTOR INC
元件分類： 網(wǎng)絡(luò)接口
英文描述： Unmanaged 24-Port 10/100 Mb + 2-Port 1 Gb Ethernet Switch
中文描述： DATACOM, LAN SWITCHING CIRCUIT, PBGA553
封裝： 37.50 X 37.50 MM, 2.33 MM HEIGHT, MS-034, HSBGA-553
文件頁(yè)數(shù)： 26/109頁(yè)
文件大?。?/td> 803K
代理商： MVTX2603AG
MVTX2603
Data Sheet
26
Zarlink Semiconductor Inc.
A class is capable of offering traffic that exceeds the contracted bandwidth. 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, such leniency must not degrade the
quality of service (QoS) received by well-behaved classes.
As Table 6 illustrates, the six traffic types may each have their own distinct properties and applications. As shown,
classes may receive bandwidth assurances or latency bounds. In the table, P3, the highest transmission class,
requires that all frames be transmitted within 1 ms, and receives 50% of the 100 Mbps of bandwidth at that port.
Best-effort (P0) traffic forms a fourth class that only receives bandwidth when none of the other classes have any
traffic to offer. It is also possible to add a fourth class that has strict priority over the other three; if this class has
even one frame to transmit, then it goes first. In the MVTX2603, each 10/100 Mbps port will support four total
classes, and each 1000 Mbps port will support eight classes. We will discuss the various modes of scheduling
these classes in the next section.
In addition, each transmission class has two subclasses, high-drop and low-drop. Well-behaved users should rarely
lose packets. But poorly behaved users – users who send frames 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, and then all frames in the worst case.
Table 6 shows that different types of applications may be placed in different boxes in the traffic table. For example,
casual web browsing fits into the category of high-loss, high-latency-tolerant traffic, whereas VoIP fits into the
category of low-loss, low-latency traffic.
7.2 Four QoS Configurations
There are four basic pieces to QoS scheduling in the MVTX2603: strict priority (SP), delay bound, weighted fair
queuing (WFQ), and best effort (BE). Using these four pieces, there are four different modes of operation, as shown
in Table 4, “Supported Memory Configurations (ZBT Mode),” and Table 6, “Two-dimensional World Traffic,” . For
10/100 Mbps ports, these modes are selected by the following registers:
Low transmission
priority, P1
12.5 Mbps
Apps: emails, file backups.
Latency: < 16 ms desired, but
not critical.
Drop: No drop if P1 not
oversubscribed.
Apps: casual web browsing.
Latency: < 16 ms desired, but
not critical.
Drop: No drop if P1 not
oversubscribed; first to drop
otherwise.
Total
100 Mbps
QOSC24 [7:6]
CREDIT_C00
QOSC28 [7:6]
CREDIT_C10
QOSC32 [7:6]
CREDIT_C20
QOSC36 [7:6]
CREDIT_C30
Table 6 - Two-dimensional World Traffic
相關(guān)PDF資料
PDF描述
MVTX2604 Managed 24-Port 10/100 Mb + 2 Port 1 Gb Ethernet Switch
MVTX2604AG Managed 24-Port 10/100 Mb + 2 Port 1 Gb Ethernet Switch
MVTX2801 Unmanaged 4-Port 1000 Mbps Ethernet Switch
MVTX2801AG Unmanaged 4-Port 1000 Mbps Ethernet Switch
MVTX2802 Managed 4-Port 1000 Mbps Ethernet Switch
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MVTX2603AG2 制造商:Microsemi Corporation 功能描述:
MVTX2604 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Managed 24-Port 10/100 Mb + 2 Port 1 Gb Ethernet Switch
MVTX2604A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MVTX260x Physical Port Control
MVTX2604AG 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Managed 24-Port 10/100 Mb + 2 Port 1 Gb Ethernet Switch
MVTX2801 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Unmanaged 4-Port 1000 Mbps Ethernet Switch
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