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Flow control - Wikipedia, the free encyclopedia Flow control is important because it is possible for a sending computer to transmit information at a faster rate than the destination computer can receive and process them. Transmit flow control can occur independently in the two directions of data transfer, thus permitting the transfer rates in one direction to be different from the transfer rates in the other direction. Flow control can be done either by control lines in a data communication interface (see serial port and RS 232), or by reserving in-band control characters to signal flow start and stop (such as the ASCII codes for XON/XOFF). en.wikipedia.org /wiki/Flow_control   (621 words)

Virtual Threads: Beware Ethernet flow control Ethernet flow control, or 802.3x, is a way for a network device to tell its immediate neighbor that it is overloaded with data, such as when a device is receiving data faster than it can process it. Flow control operates at a lower layer than TCP or IP, and thus is independent of them. Ethernet flow control accomplishes the same thing as TCP flow control in this situation, as they both slow down the data transmission to the speed that the slower device can handle. virtualthreads.blogspot.com /2006/02/beware-ethernet-flow-control.html   (2271 words)

CommsDesign - Adapting Ethernet Controllers to Meet Embedded Networking Needs   (Site not responding. Last check: 2007-09-11) Unaligned data is less than ideal for traditional Ethernet controllers that require the transmit data to be presented to the controller in a 32-bit aligned fashion. Traditionally, DMA controllers in embedded CPUs are not capable of performing the realignment of the data, rendering them useless for moving Ethernet data in the system. Not only would this Ethernet controller provide a glue-less interface to most embedded processors, all of the characteristics already discussed, such as fast overall bus cycle times, a minimal address and data setup time, and support for burst-mode reads would be applicable. www.commsdesign.com /design_corner/showArticle.jhtml?articleID=59300348   (2020 words)

Vendors on flow control An example of where Ethernet flow control might be used appropriately is at the edge of a network where Gigabit Ethernet attached servers are operating at less than wirespeed, and the link only needs to be paused for a short time, typically measured in microseconds. Flow Control was originally invented to prevent packet drops by switches that were running at less than media-speed. Flow control in the core can cause congestion in sections of the network that otherwise would not be congested. www.networkworld.com /netresources/0913flow2.html   (2067 words)

Ethernet flow control - Wikipedia, the free encyclopedia Ethernet Flow Control is defined by IEEE 802.3 for full-duplex operation. Ethernet is a specification used by computers to send information over a physical medium, such as copper cables or fibre optics. Flow control is the sub-specification that allows devices to send a message to the other host to request a pause in data transfer. en.wikipedia.org /wiki/Ethernet_flow_control   (184 words)

CommsDesign - Blast Through the Barriers to Ethernet in the Metro   (Site not responding. Last check: 2007-09-11) Ethernet comes equipped with the ability to send pause frames once a watermark is tripped, but now our reach must extend beyond the data center. Ethernet has become so economical that using a link to less than its throughput capacity has a very minor impact on the total cost of the solution. Ethernet asserts flow control on an entire link, so in the case of aggregated traffic, traffic that exceeds the CIR must be dropped. www.commsdesign.com /design_corner/OEG20030721S0054   (1950 words)

Ethernet: Distributed Packet Switching for Local Computer Networks Ethernet controllers in each station are built to adjust the mean retransmission interval in proportion to the frequency of collisions; sharing of the Ether among competing station-station transmissions is thereby kept near the optimum [20, 21]. An Ethernet gives its best efforts to transmit packets successfully, but it is the responsibility of processes in the source and destination stations to take the precautions necessary to assure reliable communication of the quality they themselves desire [18, 21]. A flow of data is said to have a sender and a receiver, recognizing that to support a flow of data some packets (typically acknowledgments) will be sourced at the receiver and destined for the sender. www.acm.org /classics/apr96   (6743 words)

Flow control feedback Flow control is a mechanism created to manage the flow of data between two full-duplex Ethernet devices. Through flow control, a device that is oversubscribed - either macroscopically from a system resource perspective or microscopically on a port-by-port basis - sends a pause message to its link partner to temporarily reduce the amount of data it's transmitting. The pros and cons of flow control implementations depend on how a device is deployed in an enterprise and the type of network traffic (data, voice or video) being carried among its link partners. www.networkworld.com /netresources/0913flow.html   (712 words)

Myrinet FAQ: What is MX/Ethernet?   (Site not responding. Last check: 2007-09-11) Ethernet Emulation is used when we would like the functionality of ethernet connectivity in addition to MX/kernel-bypass. Flow control: Myrinet's flow control is byte-level and out-of-band, whereas Ethernet's flow control is packet-level and in-band. Ethernet Emulation means simulating the Ethernet mode on top of the Myrinet mode for 2G hardware that does not have Ethernet mode. www.myri.com /fom-serve/cache/530.html   (604 words)

The experimental testbed In order to study communication protocols for parallel computing and the issue of end-to-end flow control in particular, we use a cluster of eight dual-processor Sparcstation 20s connected via Ethernet and a dedicated fiber FDDI ring [25]. Furthermore, retrial mechanisms and flow control may be included in the networking protocols which may have been design with different optimization goals than those required in parallelism. Similarly, the fact that the user has control of the synchronization, buffering, and flow control implies that it is likely to provide better performance than message passing. www.cs.jhu.edu /~gyn/publications/flow-control/node3.html   (648 words)

Intel® Express 10/100 Fast Ethernet Switch - Flow Control Problems A port's Flow LED flashes whenever a received packet needs to be forwarded to a port that already has too many packets queued. When Ethernet bandwidth is temporarily insufficient for the traffic, three actions are possible: drop packets, use flow control, or segment the network. Flow control stops transmission on a port and forces devices to resend packets, ensuring that packets aren't lost. support.intel.com /support/express/switches/10100fast/sb/cs-010976.htm   (413 words)

Ethernet (Linux Reviews) Ethernet was invented in the period of 1973–1975. The experimental Ethernet described in that paper ran at 3 Mbit/s, and had 8-bit destination and source address fields, so Ethernet addresses were not the global addresses they are today. He convinced DEC, Intel, and Xerox to work together to promote Ethernet as a standard, the so-called "DIX" standard, for "Digital/Intel/Xerox"; it standardized the 10 megabits/second Ethernet, with 48-bit destination and source addresses and a global 16-bit type field. linuxreviews.org /dictionary/Ethernet   (4586 words)

Intel® 82540EM Gigabit Ethernet Controller - Overview The Intel® 82540EM Gigabit Ethernet Controller is a single, compact component with integrated Gigabit Ethernet MAC and PHY layer functions. The controller is capable of transmitting and receiving data at 1000 Mb/s, 100 Mb/s, or 10 Mb/s data rates. The Intel 82540EM Gigabit Ethernet Controller architecture is optimized to deliver both high performance and PCI bus efficiency with the lowest power and smallest die size. developer.intel.com /design/network/products/lan/controllers/82540.htm   (961 words)

Light Reading - Ethernet Frame Relay - Telecom Ethernet, instead of being only for privately owned enterprise networks, is now becoming a basis for building new types of revenue-generating data transmission services. Additionally, active flow control might be used to control the CIR/PIR relationship by using the MPLS forward and backward congestion control to generate a flow control message to the customer’s Ethernet switches on the ends of the access links. Adding this encapsulation of Ethernet via MPLS is the final ingredient to taking Ethernet from an access service to a switched network service, where the real money is. Carriers haven’t ever been able to generate a lot of profits from packet services, just revenue. www.lightreading.com /document.asp?doc_id=15044   (1614 words)

Flow Control Flow control is the process of managing the rate at which data is transmitted. Using flow control, a computer receiving data can signal that it is not ready to receive data. TCP provides a flow control mechanism using acknowlegements of TCP sequence numbers. www.inetdaemon.com /tutorials/internet/tcp/flow_control.shtml   (100 words)

RS232 to Ethernet Protocol Converter Control signals available RTS, CTS, DTR, DSR, DCD and RI Device configured via a web browser. MicroTelnet is an RS232 to Ethernet protocol converter. The is an OEM module that requires a carrier board, such as the ones included with the complete system, with proper serial, Ethernet, and power connections. scmstore.com /english/IPControl/Telnet   (456 words)

Topics in High-Performance Messaging If the sender cannot control the rate at which new data arrives for transmission to the group, it must either buffer the data until the slowest receiver is ready or drop it. The intent of Ethernet flow control is to prevent loss in switches by providing back pressure to the sending NIC on ports that are going too fast to avoid loss. This behavior is called "flow control." In a nutshell, it prevents the receiver buffer space from overflowing by adding latency at the sender. www.29west.com /docs/THPM/thpm.html   (12014 words)

Galazar Networks - DSF2500 - 2.5 Gbps Data Service Framer for Ethernet over SONET/SDH (EoS) VCAT, GFP, LCAS applications A member of Galazar's second generation of Ethernet over SONET (EoS) mapping devices, the DSF2500 is targeted at highly integrated Ethernet transport access applications in next-generation SONET/SDH networks. It's unique combination of Ethernet ports, Gigabit Ethernet ports and a Generic packet interface (SPI-3) and make it a flexible and expandable mapping chip which can accommodate a variety of system architectures and applications. Typical uses are to add L2/L3 packet processing functions, expand the number of Ethernet ports, or add GFP-T mapping of SAN protocols. www.galazar.com /products/dsf2500_device.html   (879 words)

[realtek] rtl8139c and flow control   (Site not responding. Last check: 2007-09-11) On Tue, 4 Jun 2002, Jose Delgado wrote: > I want to enable the flow control for a rtl8139 card ("C" chip) > under Linux, and using the "options eth0" line from modules.conf. Ethernet Flow Control ("FC") is normally enabled by default. Protocol flow control can only be communicated to the layers above IP (TCP, UDP applications) by packet loss. www.beowulf.org /pipermail/realtek/2002-June/001361.html   (294 words)

Galazar Networks - MSF2500 - 2.5 Gbps Multi Service Framer for Ethernet over SONET/SDH (EoS, PDH) VCAT, GFP, LCAS ... Ethernet over SONET/SDH (EoS) is supported through Virtual Concatenation (VC) with Link Capacity Adjustment Scheme (LCAS), with simultaneous use of mixed High-Order (STS/VC paths) and Low-Order (VT/VC paths). A member of Galazar's second generation of Ethernet over SONET (EoS) mapping devices, the MSF2500 is targeted at highly integrated multi-service access applications in next-generation SONET/SDH networks. Simultaneous operation of the SPI-3 interface and the embedded Ethernet and Gigabit Ethernet MACs enables a flexible mixture of services or expansion for high density Ethernet mapping applications. www.galazar.com /products/msf2500_device.html   (1003 words)

2 Port Gigabit Ethernet Compact Fiber Switch Repeater The FlexSwitch 600XC 2Gx is a 2-port Gigabit Ethernet fiber switch that can be used as a repeater for connecting switched or shared segments and devices using fiber. The Gigabit Ethernet fiber ports are available with SC connectors for multi-mode or single-mode fiber. Using the 802.3x advanced flow control specification, the FlexSwitch 600XC controls the flow of data in order to ensure data integrity. www.omnitron-systems.com /products/6810_600xc2gx_flexswitch.php   (348 words)

v8n072, 16-Apr-01 Appian’s Active Flow Control capabilities are based on IEEE 802.3x Ethernet flow control, which would provide automatic throttling at customer premise devices when critical traffic thresholds are reached. Appian believes the ITU X.86 Ethernet over SONET support combined with active flow control will be critical for delivering standards-based Ethernet private lines as premium rate services with five-nines service availability. The ability to strictly control delay variation on traffic could be used for tiered services. www.convergedigest.com /Daily/v8/v8n072.htm   (1230 words)

Embedded.com - Adapting Ethernet Controllers to Meet Embedded Networking Needs By improving the architecture of a non-PCI Ethernet controller, designers can improve overall system performance in consumer electronics, entertainment A/V, and home network designs. Figure 1: Typical embedded system with non-PCI Ethernet connectivity. Traditional Ethernet controllers do not support burst-mode reads. www.embedded.com /showArticle.jhtml?articleID=161501199   (2152 words)

Bookpool: Gigabit Ethernet Gigabit Ethernet promises to be the solution of choice for ultra-high-speed connections in many of today's LANs. Gigabit Ethernet explains the technology in clear terms, exploring the implications for its application and operation in real-world LANs. He was a developer and co-author of the Fast Ethernet specification, both chair and editor of the IEEE 802.3x Full-Duplex/Flow Control standard, and is an active participant in the IEEE 802.3z Gigabit Ethernet Task Force. www.bookpool.com /sm/0201185539   (452 words)

Ethernet Network Card: fast ethernet, network interface card, network card, ethernet adapter, gigabit ethernet, ... 3COM 3CPC-TX-CBL Dongle for 3com PCMCIA 10/100 Ethernet 100Base-TX transceiver: 1 male connector, 1 female RJ-45 connector, 6 in length. Utilizes 10/100/1000BASE-T Gigabit Ethernet MAC, PCI Express bus interface, on-chip buffer memory, integrated PHY in a single-chip solution designed for LAN on LOM and NIC applications. Flow control; full duplex capability; fault tolerance; manageable. www.ictcompany.com /store/category.php?cid=1   (2348 words)

Storage Networking Protocol Fundamentals, Adobe Reader - $35.20   (Site not responding. Last check: 2007-09-11) The foundational learning in the book will provide the reader with a basic comparison of various networking technologies that are commonly used to transport mainstream storage protocols. In particular it provides a comparative analysis of Ethernet, TCP/IP and Fibre Channel in the context of storage. This book starts with an overview of the storage networking industry then proceeds to an overview of the OSI Reference Model and common network protocols. www.ciscopress.com /title/1587052784   (444 words)

Storage Networking Protocol Fundamentals - $44.00   (Site not responding. Last check: 2007-09-11) A comparative analysis of Ethernet, TCP/IP, and Fibre Channel in the context of SCSI Chapter 9 Flow Control and Quality of Service Conceptual Underpinnings of Flow Control and Quality of Service www.ciscopress.com /title/1587051605   (523 words)

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