- 您现在的位置：买卖IC网 > PDF目录300164 > ZL50418GKG2 (ZARLINK SEMICONDUCTOR INC) DATACOM, LAN SWITCHING CIRCUIT, PBGA553 PDF资料下载
参数资料
| 型号： | ZL50418GKG2 |
| 厂商： | ZARLINK SEMICONDUCTOR INC |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, LAN SWITCHING CIRCUIT, PBGA553 |
| 封装： | 37.50 X 37.50 MM, 2.33 MM HEIGHT, LEAD FREE, MS-034, HSBGA-553 |
| 文件页数： | 110/155页 |
| 文件大小： | 1928K |
| 代理商： | ZL50418GKG2 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页当前第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页第123页第124页第125页第126页第127页第128页第129页第130页第131页第132页第133页第134页第135页第136页第137页第138页第139页第140页第141页第142页第143页第144页第145页第146页第147页第148页第149页第150页第151页第152页第153页第154页第155页
ZL50418
Data Sheet
58
Zarlink Semiconductor Inc.
the switch. As an added bonus, although we do not assume anything about the arrival pattern, if the incoming traffic
is policed or shaped we may be able to provide additional assurances about our switch’s performance.
Table 7 shows examples of QoS applications with three transmission priorities, but best effort (P0) traffic may form
a fourth class with no bandwidth or latency assurances. Gigabit ports actually have eight total transmission
priorities.
Table 7 - Two-dimensional World Traffic
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 7 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 ZL50418, each 10/100 M port will support four total classes and
each Gigabit 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.
Goals
TotalAssured
Bandwidth (user
defined)
Low Drop Probability
(low-drop)
High Drop Probability
(high-drop)
Highest transmission
priority, P3
50 Mbps
Apps: phone calls,
circuit emulation.
Latency: < 1 ms.
Drop: No drop if P3 not
oversubscribed.
Apps: training video.
Latency: < 1 ms.
Drop: No drop if P3 not
oversubscribed; first P3 to drop
otherwise.
Middle transmission
priority, P2
37.5 Mbps
Apps: interactive apps,
Web business.
Latency: < 4-5 ms.
Drop: No drop if P2 not
oversubscribed.
Apps: non-critical interactive
apps.
Latency: < 4-5 ms.
Drop: No drop if P2 not
oversubscribed; first P2 to drop
otherwise.
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
相关PDF资料 |
PDF描述 |
|---|---|
| ZLW-2-B | 1 MHz - 1000 MHz RF/MICROWAVE DOUBLE BALANCED MIXER, 9.5 dB CONVERSION LOSS-MAX |
| ZMG71W | SINGLE COLOR LED, GREEN |
| ZMM5228/D1 | 3.9 V, 0.5 W, SILICON, UNIDIRECTIONAL VOLTAGE REGULATOR DIODE |
| ZMM5242/D1 | 12 V, 0.5 W, SILICON, UNIDIRECTIONAL VOLTAGE REGULATOR DIODE |
| ZMV934ATC | VHF BAND, 12 V, SILICON, HYPERABRUPT VARIABLE CAPACITANCE DIODE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ZL51B | 制造商:YEASHIN 制造商全称:YEASHIN 功能描述:500 mW DO-35 Hermetically Sealed Glass Zener Voltage Regulators |
| ZL56B | 制造商:YEASHIN 制造商全称:YEASHIN 功能描述:500 mW DO-35 Hermetically Sealed Glass Zener Voltage Regulators |
| ZL5V1B | 制造商:YEASHIN 制造商全称:YEASHIN 功能描述:500 mW DO-35 Hermetically Sealed Glass Zener Voltage Regulators |
| ZL5V6B | 制造商:YEASHIN 制造商全称:YEASHIN 功能描述:500 mW DO-35 Hermetically Sealed Glass Zener Voltage Regulators |
| ZL60001 | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:High speed 2.5 Gbps 850 nm VCSEL |
发布紧急采购，3分钟左右您将得到回复。