參數(shù)資料
型號： MVTX2804
廠商： Zarlink Semiconductor Inc.
英文描述： 8-Port 1000 Mbps Ethernet Distributed Switch
中文描述： 8端口1000 Mbps以太網(wǎng)交換機分布式
文件頁數(shù)： 33/174頁
文件大?。?/td> 2249K
代理商： MVTX2804
MVTX2804
Data Sheet
33
Zarlink Semiconductor Inc.
C5RS- Class 5 Reserved Size
C6RS- Class 6 Reserved Size
C7RS- Class 7 Reserved Size
Figure 5 - Buffer Partition Scheme Used in the MVTX2804
7.8.1 Dropping When Buffers Are Scarce
The following is a summary of the two examples of local dropping discussed earlier in this chapter:
If a queue is a delay-bounded queue, we have a multi-level WRED drop scheme, designed to control delay
and partition bandwidth in case of congestion.
If a queue is a WFQ-scheduled queue, we have a multi-level WRED drop scheme, designed to prevent
congestion.
In addition to these reasons for dropping, the MVTX2804 also drops frames when global buffer space becomes
scarce. The function of buffer management is to ensure that such droppings cause as little blocking as possible.
7.9
Flow Control Basics
Because frame loss is unacceptable for some applications, the MVTX2804 provides a flow control option. When
flow control is enabled, scarcity of buffer space in the switch may trigger a flow control signal; this signal tells a
source port, sending a packet to this switch, to temporarily hold off.
While flow control offers the clear benefit of no packet loss, it also introduces a problem for quality of service.
When a source port receives an Ethernet flow control signal, all microflows originating at that port, well-behaved
or not, are halted. A single packet destined for a congested output can block other packets destined for
uncongested outputs. The resulting head-of-line blocking phenomenon means that quality of service cannot be
assured with high confidence when flow control is enabled.
In the MVTX2804, each source port can independently have flow control enabled or disabled. For flow control
enabled ports, by default all frames are treated as lowest priority during transmission scheduling. This is done
so that those frames are not exposed to the WRED Dropping scheme. Frames from flow control enabled ports
Temporary
Reservation R
TMP
Per-Source Reservations 8-R
1G
Per-Class
Reservations
R
P7
, R
P6
,...R
P2
Shared Pool S
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MVTX2804AG 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:8-Port 1000 Mbps Ethernet Distributed Switch
MVTX2804AG2 制造商:Microsemi Corporation 功能描述:
MVU10-10FBK 功能描述:端子 D-10-1103K BS-33-10-P 85299 RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點電鍍:Tin over Nickel 觸點材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp
MVU10-10FBX 功能描述:端子 BLOCK FORK VNYL INS BTL BS-33-10-P RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點電鍍:Tin over Nickel 觸點材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp
MVU10-10FBX-BOTTLE 功能描述:CONN FORK BLOCK INSUL 50PC RoHS:是 類別:連接器，互連式 >> 端子 - 鏟形 系列:Scotchlok™ 標準包裝:1 系列:Scotchlok™ 端子類型:彈簧，壓接式 接線柱/接片尺寸:10 接線柱 寬度 - 外邊:0.320"（8.13mm） 長度 - 總體:1.030"（26.16mm） 安裝類型:自由懸掛 端子:壓接 線規(guī):10-12 AWG 絕緣體:絕緣 特點:- 顏色:黃 包裝:散裝 觸點表面涂層:錫 觸點材料:銅，ETP 絕緣體直徑:0.250"（6.35mm） 材料 - 絕緣體:聚酰胺（PA），尼龍 長度 - 環(huán)心道末端:0.280"（7.11mm） 長度 - 末端:0.550"（13.97mm） 內(nèi)部舌簧打開:- 相關(guān)產(chǎn)品:TR-490-ND - HAND CRIMP TOOL RACHET 10-22 AWGTH-450-ND - TOOL HAND CRIMP 6-26AWGTR-482-ND - TOOL RATCHETING 10-22AWG CRIMP920099-R-ND - TOOL 10-22AWG SCOTCHLOK CRIMP 其它名稱:000511285879115112858791180611464373
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