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	Data link layer - Wikipedia, the free encyclopedia
		The data link layer is layer two of the seven-layer OSI model.
		The data link layer is the layer of the model which ensures that data is transferred correctly between adjacent network nodes in a wide area network.
		The data link layer provides the functional and procedural means to transfer data between network entities and to detect and possibly correct errors that may occur in the Physical layer.
	en.wikipedia.org /wiki/Data_link_layer (467 words)

	Encyclopedia: Data link layer
		High-Level Data Link Control (HDLC) is a bit-oriented synchronous data link layer protocol developed by the International Organization for Standardization (ISO).
		In telecommunication, Advanced Data Communication Control Procedures (or Protocol) (ADCCP) is a bit-oriented data link layer protocol used to provide point-to-point and point-to-multipoint transmission of data frames that contain error_control information.
		Logical Link Control (LLC) is the upper portion of the data link layer of a local area network, as defined in IEEE 802.
	www.nationmaster.com /encyclopedia/Data-link-layer (2034 words)

	HDLC - High Level Data Link Control (Site not responding. Last check: 2007-10-07)
		Data is transmitted in the data field, which can vary in length depending upon the protocol using the frame.
		SNRM and SABM frames, for example, are used both to set up logical link between the primary and the secondary station and to inform the secondary station of the mode of operation to be used.
		Prior to any kind of transmission (either between two stations connected by a point to point link or between a primary and secondary station a multidrop link) a logical connection between the two communication parties must be established.
	www2.rad.com /networks/1994/hdlc/hdlc.htm (748 words)

	Data link layer -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-07)
		The data link layer is level two of the seven-level (Click link for more info and facts about OSI model) OSI model.
		It responds to service requests from the (Click link for more info and facts about network layer) network layer and issues service requests to the (Click link for more info and facts about physical layer) physical layer.
		The data link layer provides the functional and procedural means to (Transferring ownership) transfer data between network entities and to detect and possibly correct errors that may occur in the Physical layer.
	www.absoluteastronomy.com /encyclopedia/d/da/data_link_layer.htm (611 words)

	The Data Link Layer (Site not responding. Last check: 2007-10-07)
		The main task of the data link layer is to take a raw transmission facility and transform it into a line that appears free of transmission errors in the network layer.
		Another issue that arises in the data link layer (and most of the higher layers as well) is how to keep a fast transmitter from drowning a slow receiver in data.
		The problem is that the acknowledgment frames for A to B traffic compete for the use of the line with data frames for the B to A traffic.
	www2.rad.com /networks/1994/osi/datalink.htm (268 words)

	CCNA Study Notes - OSI - Data Link Layer
		Different data link layer specifications define different network and protocol characteristics, including physical addressing, network topology, error notification, sequencing of frames, and flow control.
		The Data Link layer is divided into two sublayer by the 802 standards: the Logical Link Control (LLC) and Media Access Control (MAC) sublayers.
		The Data Link layer uses a calculated value called the CRC (Cyclic Redundancy Check) that's placed into the Data Link trailer that's added to the message frame before it's sent to the Physical layer.
	defoenet.com /ccna/osi_l2.html (1380 words)

	HDLC - High-level Data Link Control(HDLC),Link Access Procedure Balanced(LAPB) - X.25 (Site not responding. Last check: 2007-10-07)
		If data is flowing in both directions (full duplex), the data frames themselves carry all the information required to ensure data integrity.
		This means that data can continue to flow in situations where there may be long "turnaround" time lags without stopping to wait for an acknowledgement.
		HDLC LAPB is the Link Layer (Level 2 of the OSI model) that is usually used by X.25, the ITU (previously called the CCITT) standard for Packet Switched Networks.
	www.sangoma.com /hdlc.htm (434 words)

	Information about RAID, NAS, Email Recovery and Hard Drive Data Recovery Services
		Data recovery relates to the many ways to extract data from inaccessible or otherwise damaged magnetic medium.
		The demand for data recovery is rising steadily and throughout time numerous devices have been created that have aided the data recovery process.
		ESS Data Recovery has worked hard to be approved by all hard disk manufacturers, so you have piece of mind when it comes to warranty maintenance.
	www.essdatarecovery.com (835 words)

	Data Recovery Link 1-800-625-6451
		Though some local companies may advertise to provide data recovery services, be aware that they may only provide basic off-the-shelf software recoveries because walk-in clean rooms are very expensive investments.
		For this reason, some companies offering data recovery services outsource their mechanical data recoveries (needing clean rooms) to one of three or four full-service providers like Data Recovery Link.
		Other data recovery companies use us as their back-up recovery service when they are unsuccessful.
	www.datarecoverylink.com (503 words)

	Soil Data Mart - Help.
		Besides containing links to the USDA and NRCS home pages, this area will also display any state or territory, county or parish, and soil survey area that you may currently have selected.
		This contains links to the various pages within this website that can always be reached, regardless of any selections that you may or may not have already made while navigating this site, such as a link to this page.
		Soil survey data on this website is updated each evening from approximately 12:00 AM to 4:00 AM Mountain time in order to provide you with the most current data possible.
	soildatamart.nrcs.usda.gov (1937 words)

	Integrated Postsecondary Education Data System (IPEDS), Data Files
		The PAS enables a user to compare a postsecondary institution of the user’s choice to a group of peer institutions which are also selected by the user.
		Data from the the Higher Education General Information Survey (HEGIS) for survey years 1980, 1984, and 1985 are also available through the PAS.
		Data Archive at International Archive of Education Data housed at the University of Michigan.
	nces.ed.gov /ipeds/data.asp (210 words)

	Free GIS Data - GIS Data Depot
		Data is available in 30m & 90m resolution data tiles.
		Data that is particularly troublesome for users is USGS SDTS formatted data.
		For those of you wishing to simply "view" the data we introduce you to a nifty, free viewing program you can use to quickly and easily view E00 and more than 80 other common data formats.
	data.geocomm.com (823 words)

	Data Wales index and search page.
		Data Wales is written, illustrated and published here in Wales.
		I'm afraid it is not possible to reply individually to link requests.
		These are some links relating to notes of a more personal interest.
	www.data-wales.co.uk (539 words)

	Basic HTML data types
		This section of the specification describes the basic data types that may appear as an element's content or an attribute's value.
		This link type tells search engines which document is considered by the author to be the starting point of the collection.
		A bookmark is a link to a key entry point within an extended document.
	www.w3.org /TR/REC-html40/types.html (2061 words)

	Data-Link Switching (DLSw)
		Granted units (the number of units that the sender has permission to send) are incremented with a flow-control indication (one of several possible indicators) from the receiver.
		Transport utilization—If the link between two DLSw partners reaches a high level of utilization, the window size can be reduced to lower the level of link utilization and to prevent packet loss between the nodes.
		This has the normal advantages of a reliable transport protocol, in which the data flow is monitored and retransmitted if any data is lost (sequence numbers and acks).
	www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/dlsw.htm (3452 words)

	Notes on Data Link Layer (Site not responding. Last check: 2007-10-07)
		One of the purposes of the Data Link layer is to form the stream of bits received by the physical layer into discrete units called frames.
		The Data Link layer may check for errors on the physical link between two neighboring devices.
		Flow control is a procedure for adjusting the rate at which data is sent to correspond to the rate the receiver can process it.
	williams.comp.ncat.edu /Networks/datalink.htm (840 words)

	BUBL LINK: Chemical data
		The other two databases are Chemical Safety Data Sheets (safety information for 550 chemicals) and the UK Nutrient Databank (authoritative database of 60 nutrients in 3000 foods).
		Periodic table of the elements providing physical (electronic, thermal and steric) data, details of isotopes, and background information such as year of discovery, name origin and uses for each element.
		Data table presenting the final results of a project to establish internationally agreed values for the thermodynamic properties of key chemical substances.
	bubl.ac.uk /link/c/chemicaldata.htm (753 words)

	Data Link Switching (DLSw)
		Data Link Switching (DLSw) is a means of transporting Systems Network Architecture (SNA) and NetBIOS traffic across a network which uses many different protocols.
		The Data Link Connections (DLCs) are terminated at the router so that the RIF ends at a virtual ring within the router.
		The DLSw SSP process spoofs the data link connections between end devices by establishing these connections between the local SNA device and its local router.
	data-link-switching-dlsw.cybersabotage.com /dlsw.htm (1453 words)

	LAN Data Link Layer Protocols - CIF \| Ethernet \| FDDI \| GARP \| GMRP \| GVRP \| LLC \| Multiprotocol over ATM \| SNAP \| SRP ...
		LAN Data Link Layer Protocols - CIF
		The Data Link Layer defines how data is formatted for transmission and how access to the network is controlled.
		IP datagrams are sent on IEEE 802 networks encapsulated within the 802.2 LLC and SNAP data link layers and the 802.3, 802.4 or 802.5 physical network layers.
	www.protocols.com /pbook/lan.htm (1905 words)

	Laser data link
		I checked the data of that module and found it to meet my needs: module is designed for 1 mm plastic fiber cable, module is designed for 665nm wavelenght and it can operate up to 5 mbit/s.
		I tested the link with my own test program and found out that communication at speeds over 9600 bps was unrealiable.
		For those interrested in faster laser link shoud take a look at the laser tranceiver project described at http://www.alphalink.com.au/~derekw/upntcvr.htm.
	www.tkk.fi /Misc/Electronics/circuits/laserlink.html (950 words)

	High Level Data Link Control (HDLC) Protocol (Site not responding. Last check: 2007-10-07)
		The HDLC protocol is a general purpose protocol which operates at the data link layer of the OSI reference model.
		Each piece of data is encapsulated in an HDLC frame by adding a trailer and a header.
		The frames are separated by HDLC flag sequences which are transmitted between each frame and whenever there is no data to be transmitted.
	www.erg.abdn.ac.uk /users/gorry/course/dl-pages/hdlc.html (156 words)

	Arrick Robotics --- OCI Wireless Data Link
		Arrick Robotics is an authorized dealer for the LAWN wireless data link from OCI.
		Data is packetized and checked for accuracy after transmission then resent if errors occur.
		The LAWN wireless data links can be networked up to 20 users with a typical coverage area 10,000 sq/ft. LAWN units can also be setup as repeaters to extened the range.
	www.robotics.com /oci.html (221 words)

	Stats about all US cities - maps, race, income, photos, education, crime, weather, houses, etc.
		We've collected and analyzed data from numerous sources to create as complete and interesting profiles of all U.S. cities as we could.
		If you ever need to research any city for any reason, from considering a move there to just checking where somebody you know is staying, this is the site for you.
		Or browse by state (first link for each state is for cities with over 6000 residents, second is for smaller towns):
	www.city-data.com (166 words)

	Synchronous Data Link Control (SDLC)and Derivatives
		The primary also sets up and tears down links and manages the link while it is operational.
		The SNA data is carried as user data in Layer 3 X.25 packets.
		SDLC was the first link-layer protocol based on synchronous, bit-oriented operation, and it remains the primary SNA link layer protocol for WAN links.
	www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/sdlcetc.htm (1686 words)

	UGS: Products: Tecnomatix
		Tecnomatix Part Manufacturing links the tasks of the manufacturing engineer, NC programmer, tool designer and tooling manager, while electronically passing such plans to the shop floor.
		Managing resource data - information on such assets as machine tools, fixtures, robots, welding guns and process templates - is a difficult challenge.
		These solutions are tied to an open manufacturing data backbone and address suppliers' critical need to more effectively quote, launch and execute manufacturing processes as part of maintaining successful OEM relationships.
	www.ugs.com /products/tecnomatix (1481 words)

	Global Financial Data
		Global Financial Data is an unparalled source for historical stock market, financial, and economic data unavailable from any other online source.
		The GFD Database includes over 7200 current and historical data series covering over 200 countries that have been collected from original sources.
		The Annual Files for GDP and Trade have been updated with data through 2004 for many of the countries.
	www.globalfindata.com (179 words)

	Data Warehousing: A Look at Business Intelligence and Data Warehouse
		This Data Warehousing and Business Intelligence site aims to help people get a good high-level understanding of what it takes to implement a successful data warehouse project.
		I also offer my observations on the data warehousing field.
		Feel free to contact me about additional information regarding data warehousing that I should include.
	www.1keydata.com /datawarehousing/datawarehouse.html (209 words)

	Timex - Data Link (Previous Products) (Site not responding. Last check: 2007-10-07)
		Current Data Link product information is available here.
		Send important information from your personal computer to the award-winning Timex Data Link® watch...
		The Timex Data Link® watch is also a full-function timepiece.
	www.timex.com /html/data_link.html (89 words)

	World Bank Group - Data and Statistics
		Almost all the data reported in this site are derived, either directly or indirectly, from official statistical systems organized and financed by national governments.
		This interactive website provides explanations of the indicators, makes data easily accessible, provides graphing tools, and gives links to other relevant sources.
		Internationally comparable data are crucial to forming sustainable policies and monitoring progress.
	www.worldbank.org /data (306 words)

	Data
		Files with authors or sources listed to the right of the link are available from the NBER or are otherwise associated with the NBER research program.
		To find other data on the web, try Resources for Economists, new economic releases, Statistical Abstracts of the United States, Google, NBER papers.
		SEE ALSO NBER LINKS for other data series.
	www.nber.org /data (153 words)

	SLIDAD (Site not responding. Last check: 2007-10-07)
		You plug the SLIDAD instead of a Link Source Card on the FEMB, so it will show the data that is sent by the FEMB.
		You can see directly the data you send on LED's and you may connect a logic state analyser to the three 20-pin connectors.
		With the single-step mode you can even receive and check the data on a word-by-word basis.
	hsi.web.cern.ch /HSI/s-link/devices/slidad (237 words)

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