2016
From Wikipedia, the free encyclopedia Internet Protocol version 6 (IPv6) is a version of the Internet Protocol (IP) that is designed to succeed Internet Protocol version 4 (IPv4). The Internet operates by transferring data in small packets that are independently routed across networks as specified by an international communications protocol known as the Internet Protocol. Each data packet contains two numeric addresses that are the packet's origin and destination devices. Since 1981, IPv4 has been the publicly used Internet Protocol, and it is currently the foundation for most Internet communications. The Internet's growth has
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ITS Council · 2001
<div class="section abstract"> <div class="htmlview paragraph">This SAE Recommended Practice details the Link Layer of the Intelligent Transportation Systems (ITS) Data Bus, which is generally intended for in-vehicle use.</div> <div class="htmlview paragraph">The ITS Data Bus (IDB) is a non-proprietary token passing bus, designed to allow disparate consumer, vehicle, and commercial electronic components to communicate and share information across a standard, open data bus. This first version of the IDB is called IDB-C.</div> <div class="htmlview paragraph">This Recommended Practice describes the Link Layer of the IDB-C, as shown in <span class="xref">Section 1</span>. Below the Link Layer of the IDB-C is the CAN 2.0B Link Layer. The Physical Layer of the IDB-C incorporates the Physical Layer as specified by SAE J2366-1 and J2590.</div> <div class="htmlview paragraph">The IDB-C Link Layer is logically divided into two functional sub-layers, viz., Logical Link Control (LLC) and Media Access Control (MAC). However, these are logical groupings that re-use some of the same bits within the CAN 2.0B frame for efficiency.</div> <div class="htmlview paragraph">The MAC sub-layer handles all media access functions, such as virtual token handling, addressing, and notifications of IDB-C configuration changes to other MAC layers on the IDB-C.</div> <div class="htmlview paragraph">The LLC sub-layer provides the mechanisms to send and receive point-to-point or broadcast frames to other LLC sub-layers on the IDB-C. In addition, the LLC provides an Alternate Transport Identifier (ATID) allowing more than one set of higher layer protocols to be used on a single Node.</div></div>
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Martin H. Weik · 2000
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SpringerReference · 2011
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Rahul Banerjee · 2010
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Peter Boait, Geoff Neville, Ruth Norris et al. · 1988
The Data Link Layer (sometimes abbreviated to Link Layer) provides transparent transfer of data link service data units between network entities. The Physical Layer described in the previous chapter provides transparent transmission of physical service data units between data link entities. Physical service data units consist of one bit in serial transmission or n bits in parallel transmission. In the Data Link Layer the service data unit is an arbitrary but variable number of bits, containing user data and protocol information from the layers above.
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ROSSI, MICHELE · Research Padua Archive (University of Padua) · 2011
In digital telecommunication systems the link layer is responsible for the transmission of data streams over point to point links. It performs framing of higher layer packets into link layer packet data units (PDUs) and can perform packet error recovery by exploiting ARQ mechanisms. In addition, the link layer also implements channel access procedures, which are often tightly coupled with the adopted ARQ scheme. Operations at this layer are essential for reliable and efficient transmissions over noisy and possibly shared links. We observe that the QoS at the application layer is highly dependent on the combination of techniques that we use at this layer as well as on the way we configure them. In particular, the following techniques play a fundamental role in the link layer: 1) the selected retransmission policy, 2) the feedback strategy that is used, at the receiver, to request the retransmissions of lost packets, 3) the channel access mechanism, 4) adaptive behavior in terms of data frame length (as a function of the error rate) as well as 5) advanced features such as combined ARQ and coding (for throughput enhancement). This chapter will give a solid introduction to points 1-4, will discuss some techniques related to point 5 and will cover the data link layer techniques used in Ethernet, IEEE~802.11 and Bluetooth.
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James Kempf · 2024
Link–layer protocols are at the bottom of the networking stack and are crucial for the transmission of data and control actions between devices within a building and the BEMS, which typically runs in a cloud or private data center. LAN technologies such as Ethernet and wireless LAN, or Wi-Fi, act as the communication backhaul within the building. They provide the bridge between the devices on the device layer and the ISP's public Internet service to the cloud or private data center. Legacy devices that communicate over a serial protocol and devices that run over a low-power WPAN built with the 802.15.4 WPAN protocol or Bluetooth Low Energy (BLE) may require bridging into the building LAN. In many cases, the building's Internet connection may be sufficient for providing service for an operational technology such as the BEMS, but in others reliability concerns may require another solution. Wide area-wireless protocols such as LoRa and cellular protocols such as LTE Cat M and NB-IoT allow device traffic or aggregated BEMS traffic to run over a dedicated service so it will not be impacted by consumer or other business uses.
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Martin H. Weik · 2000
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Truck Bus Control and Communications Network Committee · 2022
<div class="section abstract"> <div class="htmlview paragraph">The SAE J1939 documents are intended for light, medium, and heavy-duty vehicles used on or off road, as well as appropriate stationary applications which use vehicle derived components (e.g., generator sets). Vehicles of interest include, but are not limited to, on- and off-highway trucks and their trailers, construction equipment, and agricultural equipment and implements.</div> <div class="htmlview paragraph">The purpose of these documents is to provide an open interconnect system for electronic systems. It is the intention of these documents to allow Electronic Control Units to communicate with each other by providing a standard architecture.</div> <div class="htmlview paragraph">This particular document, SAE J1939-21, describes the data link layer using the Classical Extended Frame Format (CEFF) with 29-bit IDs, as defined in ISO 11898-1, December 2015. For SAE J1939, no alternative data link layers are permitted.</div></div>
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Truck and Bus Control and Communications Network Committee · 1998
<div class="section abstract"> <div class="htmlview paragraph">As described in the parent document, SAE J1939, there are a minimum of seven documents required to fully define a SAE J1939 network. This particular document, SAE J1939-21, describes a Data Link Layer using the CAN protocol with 29 bit Identifiers. For SAE J1939, no alternative data link layers are permitted.</div></div>
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Martin H. Weik · 2000
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Jörg Schwenk · Vieweg+Teubner eBooks · 2010
Die Sicherungsschicht (OSI-Schicht 2) dient eigentlich zur verlässlichen Übertragung von Datenrahmen („Frames“) zwischen zwei Computern (oder aktiven Netzwerkkomponenten) über ein einheitliches physikalisches Medium (z.B. eine direkte Kupferdraht-Verbindung) [Tan02]. Zu den Protokollen, die auf dieser Ebene eingesetzt werden, zählen so unterschiedliche Verfahren wie Ethernet (eine Rundfunksendung auf einem Draht) und diverse Modemstandards (Übertragung von Daten als Folge von Tönen über eine analoge Telefonverbindung). Mittlerweile ist das Einsatzgebiet von Schicht-2-Protokollen vielfältiger geworden. Es reicht von neuen physikalischen Medien wie Wireless LAN oder Mobilfunk bis hin zu Verbindungen, die größere Distanzen im Internet überbrücken.
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Truck and Bus Control and Communications Network Committee · 2015
<div class="section abstract"> <div class="htmlview paragraph">The SAE J1939 documents are intended for light, medium, and heavy-duty vehicles used on or off road as well as appropriate stationary applications which use vehicle derived components (e.g., generator sets). Vehicles of interest include, but are not limited to, on- and off-highway trucks and their trailers, construction equipment, and agricultural equipment and implements.</div> <div class="htmlview paragraph">The purpose of these documents is to provide an open interconnect system for electronic systems. It is the intention of these documents to allow Electronic Control Units to communicate with each other by providing a standard architecture.</div> <div class="htmlview paragraph">This particular document, SAE J1939-21, describes the data link layer using the CAN protocol with 29-bit Identifiers. For SAE J1939 no alternative data link layers are permitted.</div></div>
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E. Arthurs, B. W. Stuck · 1981
ETHERNET) on each station that is attempting to transmit, this access policy makes it more likely a successful message transmission will occur, and in less time, than the published Version 1.0. Theoretical analysis substantiates these claims. 14
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Hooman Honary, Honary Hooman, A Hardware et al. · 1996
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John Bainbridge · 2002
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Holger Karl, Andreas Willig · 2005
This chapter contains sections titled: Fundamentals: tasks and requirements Error control Framing Link management Summary
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Auerbach Publications eBooks · 2014
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Kristof Obermann, Martin Horneffer · 2013
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