Ethernet Basics Ethernet Basics
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Mikrodenetleyicili Endüstriyel Seri Protokol Çözümleyici Sisteminin Programi
YILDIZ TEKNİK ÜNİVERSİTESİ FEN BİLİMLERİ ENSTİTÜSÜ MİKRODENETLEYİCİLİ ENDÜSTRİYEL SERİ PROTOKOL ÇÖZÜMLEYİCİ SİSTEMİNİN PROGRAMI Elektronik ve Haberleşme Müh. Kemal GÜNSAY FBE Elektronik ve Haberleşme Anabilim Dalı Elektronik Programında Hazırlanan YÜKSEK LİSANS TEZİ Tez Danışmanı : Yrd. Doç. Dr. Tuncay UZUN (YTÜ) İSTANBUL, 2009 YILDIZ TEKNİK ÜNİVERSİTESİ FEN BİLİMLERİ ENSTİTÜSÜ MİKRODENETLEYİCİLİ ENDÜSTRİYEL SERİ PROTOKOL ÇÖZÜMLEYİCİ SİSTEMİNİN PROGRAMI Elektronik ve Haberleşme Müh. Kemal GÜNSAY FBE Elektronik ve Haberleşme Anabilim Dalı Elektronik Programında Hazırlanan YÜKSEK LİSANS TEZİ Tez Danışmanı : Yrd. Doç. Dr. Tuncay UZUN (YTÜ) İSTANBUL, 2009 İÇİNDEKİLER Sayfa KISALTMA LİSTESİ ................................................................................................................ v ŞEKİL LİSTESİ ...................................................................................................................... viii ÇİZELGE LİSTESİ .................................................................................................................... x ÖNSÖZ ...................................................................................................................................... xi ÖZET ........................................................................................................................................ xii ABSTRACT ............................................................................................................................ xiii 1. GİRİŞ ...................................................................................................................... -
Gigabit Ethernet - CH 3 - Ethernet, Fast Ethernet, and Gigabit Ethern
Switched, Fast, and Gigabit Ethernet - CH 3 - Ethernet, Fast Ethernet, and Gigabit Ethern.. Page 1 of 36 [Figures are not included in this sample chapter] Switched, Fast, and Gigabit Ethernet - 3 - Ethernet, Fast Ethernet, and Gigabit Ethernet Standards This chapter discusses the theory and standards of the three versions of Ethernet around today: regular 10Mbps Ethernet, 100Mbps Fast Ethernet, and 1000Mbps Gigabit Ethernet. The goal of this chapter is to educate you as a LAN manager or IT professional about essential differences between shared 10Mbps Ethernet and these newer technologies. This chapter focuses on aspects of Fast Ethernet and Gigabit Ethernet that are relevant to you and doesn’t get into too much technical detail. Read this chapter and the following two (Chapter 4, "Layer 2 Ethernet Switching," and Chapter 5, "VLANs and Layer 3 Switching") together. This chapter focuses on the different Ethernet MAC and PHY standards, as well as repeaters, also known as hubs. Chapter 4 examines Ethernet bridging, also known as Layer 2 switching. Chapter 5 discusses VLANs, some basics of routing, and Layer 3 switching. These three chapters serve as a precursor to the second half of this book, namely the hands-on implementation in Chapters 8 through 12. After you understand the key differences between yesterday’s shared Ethernet and today’s Switched, Fast, and Gigabit Ethernet, evaluating products and building a network with these products should be relatively straightforward. The chapter is split into seven sections: l "Ethernet and the OSI Reference Model" discusses the OSI Reference Model and how Ethernet relates to the physical (PHY) and Media Access Control (MAC) layers of the OSI model. -
Data Link Layer
Data link layer Goals: ❒ Principles behind data link layer services ❍ Error detection, correction ❍ Sharing a broadcast channel: Multiple access ❍ Link layer addressing ❍ Reliable data transfer, flow control: Done! ❒ Example link layer technology: Ethernet Link layer services Framing and link access ❍ Encapsulate datagram: Frame adds header, trailer ❍ Channel access – if shared medium ❍ Frame headers use ‘physical addresses’ = “MAC” to identify source and destination • Different from IP address! Reliable delivery (between adjacent nodes) ❍ Seldom used on low bit error links (fiber optic, co-axial cable and some twisted pairs) ❍ Sometimes used on high error rate links (e.g., wireless links) Link layer services (2.) Flow Control ❍ Pacing between sending and receiving nodes Error Detection ❍ Errors are caused by signal attenuation and noise. ❍ Receiver detects presence of errors signals sender for retrans. or drops frame Error Correction ❍ Receiver identifies and corrects bit error(s) without resorting to retransmission Half-duplex and full-duplex ❍ With half duplex, nodes at both ends of link can transmit, but not at same time Multiple access links / protocols Two types of “links”: ❒ Point-to-point ❍ PPP for dial-up access ❍ Point-to-point link between Ethernet switch and host ❒ Broadcast (shared wire or medium) ❍ Traditional Ethernet ❍ Upstream HFC ❍ 802.11 wireless LAN MAC protocols: Three broad classes ❒ Channel Partitioning ❍ Divide channel into smaller “pieces” (time slots, frequency) ❍ Allocate piece to node for exclusive use ❒ Random -
MAC Protocols for IEEE 802.11Ax: Avoiding Collisions on Dense Networks Rafael A
MAC Protocols for IEEE 802.11ax: Avoiding Collisions on Dense Networks Rafael A. da Silva1 and Michele Nogueira1;2 1Department of Informatics, Federal University of Parana,´ Curitiba, PR, Brazil 2Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA, USA E-mails: [email protected] and [email protected] Wireless networks have become the main form of Internet access. Statistics show that the global mobile Internet penetration should exceed 70% until 2019. Wi-Fi is an important player in this change. Founded on IEEE 802.11, this technology has a crucial impact in how we share broadband access both in domestic and corporate networks. However, recent works have indicated performance issues in Wi-Fi networks, mainly when they have been deployed without planning and under high user density. Hence, different collision avoidance techniques and Medium Access Control protocols have been designed in order to improve Wi-Fi performance. Analyzing the collision problem, this work strengthens the claims found in the literature about the low Wi-Fi performance under dense scenarios. Then, in particular, this article overviews the MAC protocols used in the IEEE 802.11 standard and discusses solutions to mitigate collisions. Finally, it contributes presenting future trends arXiv:1611.06609v1 [cs.NI] 20 Nov 2016 in MAC protocols. This assists in foreseeing expected improvements for the next generation of Wi-Fi devices. I. INTRODUCTION Statistics show that wireless networks have become the main form of Internet access with an expected global mobile Internet penetration exceeding 70% until 2019 [1]. Wi-Fi Notice: This work has been submitted to the IEEE for possible publication. -
Understanding Linux Internetworking
White Paper by David Davis, ActualTech Media Understanding Linux Internetworking In this Paper Introduction Layer 2 vs. Layer 3 Internetworking................ 2 The Internet: the largest internetwork ever created. In fact, the Layer 2 Internetworking on term Internet (with a capital I) is just a shortened version of the Linux Systems ............................................... 3 term internetwork, which means multiple networks connected Bridging ......................................................... 3 together. Most companies create some form of internetwork when they connect their local-area network (LAN) to a wide area Spanning Tree ............................................... 4 network (WAN). For IP packets to be delivered from one Layer 3 Internetworking View on network to another network, IP routing is used — typically in Linux Systems ............................................... 5 conjunction with dynamic routing protocols such as OSPF or BGP. You c an e as i l y use Linux as an internetworking device and Neighbor Table .............................................. 5 connect hosts together on local networks and connect local IP Routing ..................................................... 6 networks together and to the Internet. Virtual LANs (VLANs) ..................................... 7 Here’s what you’ll learn in this paper: Overlay Networks with VXLAN ....................... 9 • The differences between layer 2 and layer 3 internetworking In Summary ................................................. 10 • How to configure IP routing and bridging in Linux Appendix A: The Basics of TCP/IP Addresses ....................................... 11 • How to configure advanced Linux internetworking, such as VLANs, VXLAN, and network packet filtering Appendix B: The OSI Model......................... 12 To create an internetwork, you need to understand layer 2 and layer 3 internetworking, MAC addresses, bridging, routing, ACLs, VLANs, and VXLAN. We’ve got a lot to cover, so let’s get started! Understanding Linux Internetworking 1 Layer 2 vs. -
Migrating Backoff to the Frequency Domain
No Time to Countdown: Migrating Backoff to the Frequency Domain Souvik Sen Romit Roy Choudhury Srihari Nelakuditi Duke University Duke University University of South Carolina Durham, NC, USA Durham, NC, USA Columbia, SC, USA [email protected] [email protected] [email protected] ABSTRACT 1. INTRODUCTION Conventional WiFi networks perform channel contention in Access control strategies are designed to arbitrate how mul- time domain. This is known to be wasteful because the chan- tiple entities access a shared resource. Several distributed nel is forced to remain idle while all contending nodes are protocols embrace randomization to achieve arbitration. In backing off for multiple time slots. This paper proposes to WiFi networks, for example, each participating node picks a break away from convention and recreate the backing off op- random number from a specified range and begins counting eration in the frequency domain. Our basic idea leverages the down. The node that finishes first, say N1, wins channel con- observation that OFDM subcarriers can be treated as integer tention and begins transmission. The other nodes freeze their numbers. Thus, instead of picking a random backoff duration countdown temporarily, and revive it only after N1’s trans- in time, a contending node can signal on a randomly cho- mission is complete. Since every node counts down at the sen subcarrier. By employing a second antenna to listen to same pace, this scheme produces an implicit ordering among all the subcarriers, each node can determine whether its cho- nodes. Put differently, the node that picks the smallest ran- sen integer (or subcarrier) is the smallest among all others. -
Collision Detection
Computer Networking Michaelmas/Lent Term M/W/F 11:00-12:00 LT1 in Gates Building Slide Set 3 Evangelia Kalyvianaki [email protected] 2017-2018 1 Topic 3: The Data Link Layer Our goals: • understand principles behind data link layer services: (these are methods & mechanisms in your networking toolbox) – error detection, correction – sharing a broadcast channel: multiple access – link layer addressing – reliable data transfer, flow control • instantiation and implementation of various link layer technologies – Wired Ethernet (aka 802.3) – Wireless Ethernet (aka 802.11 WiFi) • Algorithms – Binary Exponential Backoff – Spanning Tree 2 Link Layer: Introduction Some terminology: • hosts and routers are nodes • communication channels that connect adjacent nodes along communication path are links – wired links – wireless links – LANs • layer-2 packet is a frame, encapsulates datagram data-link layer has responsibility of transferring datagram from one node to adjacent node over a link 3 Link Layer (Channel) Services • framing, physical addressing: – encapsulate datagram into frame, adding header, trailer – channel access if shared medium – “MAC” addresses used in frame headers to identify source, dest • different from IP address! • reliable delivery between adjacent nodes – we see some of this again in the Transport Topic – seldom used on low bit-error link (fiber, some twisted pair) – wireless links: high error rates 4 Link Layer (Channel) Services - 2 • flow control: – pacing between adjacent sending and receiving nodes • error control: – error -
Fact Sheet: Single-Pair Ethernet Trade Article
Fact sheet Single Pair Ethernet Matthias Fritsche – product manager device connectivity & Jonas Diekmann – technical editor HARTING Technology group – October 2016– November 2016 Wireless technology and optical cable have already been often heralded as the future transmission technology. However, simple twisted pair cable based on plain old copper, often pronounced dead, is the most common transmission medium. Simple, robust, and perhaps with 100GBASE T1 soon to be also incredibly fast. From the beginnings of Ethernet in the 1970s, then via diverse multi-pair Ethernet developments with multiple parallel transmission paths, now apparently we are taking a step back. Back to single twisted-pair. With a new protocol and new PHYs transmission rates of up to 10 Gbit/s and PoDL capacities of up to 60 W are no longer a problem. Ultimately one pair is enough. When the team surrounding David Boggs and Robert Metcalf in the 1970s developed Ethernet at the Xerox Palo Alto Research Center (PARC), no one could foresee that this transmission method would develop so dynamically and dominate data transmission worldwide to this day. The original 10BASE5 Ethernet still used coax cable as the common medium. Today, next to wireless and optical cables, twisted-pair cable, often pronounced dead, is the most frequently used transmission medium. Starting in 1990 with 10BASE-T, the data transmission rate of the IEEE standards increased by a factor of 10 approximately every 5 years over 100BASE-TX and 1000BASE-T up to 10GBASE-T. This series could not be continued for the jump to 100GBASE-T, instead however four new IEEE standards were finalized in 2016. -
Ethernet Coax Transceiver Interface 1CY7B8392 Functional Description
CY7B8392 Ethernet Coax Transceiver Interface 1CY7B8392 Functional Description Features The CY7B8392 is a low power coaxial transceiver for Ethernet 10BASE5 and 10BASE2 applications. The device contains all • Compliant with IEEE802.3 10BASE5 and 10BASE2 the circuits required to perform transmit, receive, collision de- • Pin compatible with the popular 8392 tection, heartbeat generation, jabber timer and attachment • Internal squelch circuit to eliminate input noise unit interface (AUI) functions. In addition, the CY7B8392 fea- • Hybrid mode collision detect for extended distance tures an advanced hybrid collision detection. • Automatic AUI port isolation when coaxial connector is The transmitter output is connected directly to a double termi- not present nated 50Ω cable. • Low power BiCMOS design The CY7B8392 is fabricated with an advanced low power • 16-Pin DIP or 28-Pin PLCC BiCMOS process. Typical standby current during idle is 25 mA. Logic Block Diagram RX+ HIGH PASS AUI CCM EQUALIZATION DRIVER RX– RXI LOW PASS FILTER CD+ AUI GND – CARRIER DRIVER LOW PASS SENSE CD– FILTER + TX+ TX– – COLLISION CDS LOW PASS + RCV FILTER TXO WAVEFORM + DC/AC SHAPING SQUELCH – VEE 10 MHz CLK WATCHDOG JABBER RESET OSC TIMER26 ms TIMER0.4 sec RR+ REFERENCE 1K CIRCUIT TRANSMIT RECEIVE RR– STATE STATE MACHINE MACHINE HBE 8392–1 Pin Configurations PLCC DIP Top View Top View – RX+ CD CD+ CDS NC RXI TXO CD+ 1 16 CDS 432 1 28 2726 CD– 2 15 TXO VEE (NC) 5 25 VEE (NC) RX+ 3 14 RXI VEE (NC) 6 24 VEE V VEE 7 23 VEE (NC) EE 4 13 VEE 7B8392 7B8392 VEE 8 22 VEE (NC) VEE 5 12 RR– VEE (NC) 9 21 VEE RX– 6 11 RR+ VEE (NC) 10 20 VEE (NC) TX+ 7 10 GND VEE (NC) 11 121314 15 16 1718 RR– TX– 8 9 HBE – – TX+ TX RX 8392–3 RR+ HBE GND GND 8392–2 Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600 Document #: 38-02016 Rev. -
Automotive Ethernet Kirsten Matheus , Thomas Königseder Frontmatter More Information
Cambridge University Press 978-1-108-84195-5 — Automotive Ethernet Kirsten Matheus , Thomas Königseder Frontmatter More Information Automotive Ethernet Third Edition Learn about the latest developments in Automotive Ethernet technology and imple- mentation with this fully revised third edition. Including 20% new material and greater technical depth, coverage is expanded to include Detailed explanations of the new PHY technologies 10BASE-T1S (including multi- drop) and 2.5, 5, and 10GBASE-T1 Discussion of EMC interference models Descriptions of the new TSN standards for automotive use More on security concepts An overview of power saving possibilities with Automotive Ethernet Explanation of functional safety in the context of Automotive Ethernet An overview of test strategies The main lessons learned Industry pioneers share the technical and non-technical decisions that have led to the success of Automotive Ethernet, covering everything from electromagnetic require- ments and physical layer technologies, QoS, and the use of VLANs, IP, and service discovery, to network architecture and testing. The guide for engineers, technical managers, and researchers designing components for in-car electronics, and those interested in the strategy of introducing a new technology. Kirsten Matheus is a communications engineer who is responsible for the in-vehicle networking strategy at BMW and who has established Ethernet-based communication as a standard technology within the automotive industry. She has previously worked for Volkswagen, NXP, and Ericsson. In 2019 she was awarded the IEEE-SA Standards Medallion “For vision, leadership, and contributions to developing auto- motive Ethernet networking.” Thomas Königseder is CTO at Technica Engineering, supporting the smooth introduc- tion of Ethernet-based systems for automotive customers. -
The Essential Guide to Audio Over IP for Broadcasters 2 5
The Essential Guide To Audio OverIP FOR BROADCASTERS Powerful Performance | Powerful Control | Powerful Savings i 1. Why IP for Broadcast Audio? Reasons to Migrate to Audio over IP ..........................................................................................................8 1. Flexibility ..................................................................................................................................................................................8 2. Cost ...........................................................................................................................................................................................8 3. Scalability ................................................................................................................................................................................9 4. Reliability (yes really!) .........................................................................................................................................................9 5. Availability ..............................................................................................................................................................................9 6. Control and Monitoring .....................................................................................................................................................9 7. Network Consolidation ......................................................................................................................................................9 -
Linux Networking Cookbook.Pdf
Linux Networking Cookbook ™ Carla Schroder Beijing • Cambridge • Farnham • Köln • Paris • Sebastopol • Taipei • Tokyo Linux Networking Cookbook™ by Carla Schroder Copyright © 2008 O’Reilly Media, Inc. All rights reserved. Printed in the United States of America. Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472. O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (safari.oreilly.com). For more information, contact our corporate/institutional sales department: (800) 998-9938 or [email protected]. Editor: Mike Loukides Indexer: John Bickelhaupt Production Editor: Sumita Mukherji Cover Designer: Karen Montgomery Copyeditor: Derek Di Matteo Interior Designer: David Futato Proofreader: Sumita Mukherji Illustrator: Jessamyn Read Printing History: November 2007: First Edition. Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of O’Reilly Media, Inc. The Cookbook series designations, Linux Networking Cookbook, the image of a female blacksmith, and related trade dress are trademarks of O’Reilly Media, Inc. Java™ is a trademark of Sun Microsystems, Inc. .NET is a registered trademark of Microsoft Corporation. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and O’Reilly Media, Inc. was aware of a trademark claim, the designations have been printed in caps or initial caps. While every precaution has been taken in the preparation of this book, the publisher and author assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein.