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參數(shù)資料
| 型號(hào)： | MVTX2602AG |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類(lèi)： | 網(wǎng)絡(luò)接口 |
| 英文描述： | Managed 24 Port 10/100 Mbps 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)： | 33/147頁(yè) |
| 文件大?。?/td> | 924K |
| 代理商： | MVTX2602AG |
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MVTX2602
Data Sheet
33
Zarlink Semiconductor Inc.
7.2 Four QoS Configurations
There are four basic pieces to QoS scheduling in the MVTX2602: 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 the tables below. For 10/100 Mbps ports, the following registers select these modes:
The default configuration for a 10/100 Mbps port is three delay-bounded queues and one best-effort queue. The
delay bounds per class are 0,8 ms for P3, 3.2 ms for P2, and 12.8 ms for P1. Best effort traffic is only served when
there is no delay-bounded traffic to be served.
We have a second configuration for a 10/100 Mbps port in which there is one strict priority queue, two delay
bounded queues and one best effort queue. The delay bounds per class are 3.2 ms for P2 and 12.8 ms for P1. If
the user is to choose this configuration, it is important that P3 (SP) traffic be either policed or implicitly bounded
(e.g., if the incoming P3 traffic is very light and predictably patterned). Strict priority traffic, if not admission-
controlled at a prior stage to the MVTX2602, can have an adverse effect on all other classes’ performance.
The third configuration for a 10/100 Mbps port contains one strict priority queue and three queues receiving a
bandwidth partition via WFQ. As in the second configuration, strict priority traffic needs to be carefully controlled. In
the fourth configuration all queues are served using a WFQ service discipline.
7.3 Delay Bound
In the absence of a sophisticated QoS server and signalling protocol, the MVTX2602 may not know the mix of
incoming traffic ahead of time. To cope with this uncertainty, our delay assurance algorithm dynamically adjusts its
scheduling and dropping criteria, guided by the queue occupancies and the due dates of their head-of-line (HOL)
frames. As a result, we assure latency bounds for all admitted frames with high confidence, even in the presence of
system-wide congestion. Our algorithm identifies misbehaving classes and intelligently discards frames at no
detriment to well-behaved classes. Our algorithm also differentiates between high-drop and low-drop traffic with a
weighted random early drop (WRED) approach. Random early dropping prevents congestion by randomly dropping
a percentage of high-drop frames even before the chip’s buffers are completely full, while still largely sparing low-
drop frames. This allows high-drop frames to be discarded early, as a sacrifice for future low-drop frames. Finally,
the delay bound algorithm also achieves bandwidth partitioning among classes.
QOSC24 [7:6] CREDIT_C00
QOSC28 [7:6] CREDIT_C10
QOSC32 [7:6] CREDIT_C20
QOSC36 [7:6] CREDIT_C30
P3
P2
P1
P0
Op1 (default)
Delay Bound
BE
Op2
SP
Delay Bound
BE
Op3
SP
WFQ
Op4
WFQ
Table 6 - Four QoS Configurations for a 10/100 Mbps Port
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MVTX2603 | Unmanaged 24-Port 10/100 Mb + 2-Port 1 Gb Ethernet Switch |
| MVTX2603AG | Unmanaged 24-Port 10/100 Mb + 2-Port 1 Gb Ethernet Switch |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MVTX2602AG2 | 制造商:Microsemi Corporation 功能描述: |
| MVTX2603 | 制造商:ZARLINK 制造商全稱(chēng):Zarlink Semiconductor Inc 功能描述:Unmanaged 24-Port 10/100 Mb + 2-Port 1 Gb Ethernet Switch |
| MVTX2603A | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Unmanaged 24 port 10/100Mb + 2 port 1Gb Ethernet switch |
| MVTX2603AG | 制造商:ZARLINK 制造商全稱(chēng):Zarlink Semiconductor Inc 功能描述:Unmanaged 24-Port 10/100 Mb + 2-Port 1 Gb Ethernet Switch |
| MVTX2603AG2 | 制造商:Microsemi Corporation 功能描述: |
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