Data links such as Link 11, 16, 22 and BOWMAN, JTRS and even TETRA provide the means of transmitting data ( such as images, targeting information etc.

# ATM Layer correspond roughly to the OSI Data Link Layer

The services and protocols specified in IEEE 802 map to the lower two layers ( Data Link and Physical ) of the seven-layer OSI networking reference model.

In fact, IEEE 802 splits the OSI Data Link Layer into two sub-layers named Logical Link Control ( LLC ) and Media Access Control ( MAC ), so that the layers can be listed like this:

Switched Ethernet has been for some time the most common Data Link Layer and Physical Layer implementation for local area networks.

At the Data Link Layer, multicast describes one-to-many distribution such as Ethernet multicast addressing, Asynchronous Transfer Mode ( ATM ) point-to-multipoint virtual circuits ( P2MP ) or Infiniband multicast.

Each wireless technology is defined by a standard that describes unique functions at both the Physical and the Data Link layers of the OSI Model.

ADCCP is an ANSI standard, X3. 66, derived from IBM's Synchronous Data Link Control ( SDLC ) protocol, and is functionally equivalent to the ISO High-Level Data Link Control ( HDLC ) standard.

These protocols reside in the Data Link or Transport Layers of the OSI model.

CSMA / CA is a protocol that operates in the Data Link Layer ( Layer 2 ) of the OSI model.

* At the Data Link Layer: The IEEE 802. 2 protocol at the Logical Link Control sublayer of the data link layer may provide both connectionless and connection-oriented services.

In civil aviation, a data-link system ( known as Controller Pilot Data Link Communications ) is used to send information between aircraft and air traffic controllers when an aircraft is too far from the ATC to make voice radio communication and radar observations possible.

Note 2: Flag sequences are used in bit-oriented protocols, such as Advanced Data Communication Control Procedures ( ADCCP ), Synchronous Data Link Control ( SDLC ), and High-Level Data Link Control ( HDLC ).

* Data Link Layer

Multiplexing is provided by the Physical Layer of the OSI model, while multiple access also involves a media access control protocol, which is part of the Data Link Layer.

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.

# The Layer 2 ( Data Link Layer ) PDU is the frame

The correct term for a data unit at the Data Link Layer — Layer 2 of the seven-layer OSI model — is a frame, and at Layer 4, the Transport Layer, the correct term is a segment or datagram.

With respect to the OSI model of network design, a cable modem is both Physical Layer ( Layer 1 ) device and a Data Link Layer ( Layer 2 ) forwarder.

Broadly it deals with protecting specific chunks of data, both physically ( i. e., from corruption, or destruction, or removal ; e. g., see Physical security ), or the interpretation of them, or parts of them to meaningful information ( e. g., by looking at the strings of bits that they comprise, concluding specific valid credit-card numbers ; e. g., see Data encryption ).

As a result of 18 months of studies and discussions, SC16 adopted a layered architecture comprising seven layers ( Physical, Data Link, Network, Transport, Session, Presentation, and Application ).

* Data Management, consisting of supervisor support for Physical IOCS, and macros for Logical IOCS which could be incorporated into the user's processing programs.

* Physical and Chemical Property Data Sources – a list of references which cover several chemical and physical properties of various materials

The standard covers the Physical layer and the Media Access Control part of the Data link layer like 802. 11.

The standard covers Physical, Data Link Control and Convergence layers.

*** Volume I – Part I: The Data of Psychology ; Part II: The Inductions of Psychology ; Part III: General Synthesis ; Part IV: Special Synthesis ; Part V: Physical Synthesis ; Appendix

On the ARPANET, the protocols in the Physical Layer, the Data Link Layer, and the Network Layer used within the network were implemented on separate Interface Message Processors ( IMPs ).

* Corum, J. F., and K. L. Corum, " A Physical Interpretation of the Colorado Springs Data ".

The main Campus, which is developed around the main building in Piazzale Europa, housing the Rector's office, the Administration offices, the Main Library and the faculties of Law and Political Sciences, includes the buildings of the faculties of Economics, Pharmacy, Mathematical Physical and Natural Sciences, Engineering, the Medical Institutes of Microbiology and Physiology, the towing tank, the Data Processing Centre and the building where the Department of Chemical Sciences and the Department of Biochemistry, Biophysics and Macromolecular Chemistry are accommodated.

* ChemSpider, Free access to > 20 Million Chemical Structures, Physical Property Data and Systematic Identifiers

* Joint Committee on Atomic and Molecular Physical Data ( another well-known standard, especially for spectroscopic data )

* FIPS PUB 31 Guidelines for Automatic Data Processing Physical Security and Risk Management 1974

Physical Data Model Options.

*" Environmental Media: Accessing Virtual Representations of Real-Time Sensor Data and Site-specific Annotations Embedded in Physical Environments " in Proc.

Data Over Cable Service Interface Specification ( DOCSIS ) Provisioning of Ethernet Passive Optical Network, or DPoE, is a set of Cable Television Laboratory specifications that implement the DOCSIS service layer interface on existing Ethernet PON ( EPON, GEPON or 10G-EPON ) Media Access Control ( MAC ) and Physical layer ( PHY ) standards.

DPDCH, Dedicated Physical Data CHannel, is a term from UMTS.

* Physical Data modeling

* ASTM E29-06b, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

An RPG program typically starts off with File Specifications, listing all files being written to, read from or updated, followed by Data Definition Specifications containing program elements such as Data Structures and dimensional arrays, much like a " Working-Storage " section of a COBOL program or " var " statements in Pascal.

* Data Description Specifications, AS / 400 programming

* ASTM E29-06b, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

Built on top of the industry ’ s DOCSIS ( Data Over Cable Service Interface Specifications ) cable modem infrastructure, PacketCable networks use the Internet Protocol ( IP ) to enable a wide range of multimedia services, such as Voice over IP ( IP telephony ), multimedia conferencing, interactive gaming, and general multimedia applications.

The OPC Data Access Specification is the first of a group of specifications known as the Classic OPC Specifications.

Industry standards for defining PMI include ASME Y14. 41-2003 Digital Product Data Definition Practices and ISO 1101: 2004 Geometrical Product Specifications ( GPS ) -- Geometrical tolerancing — Tolerances of form, orientation, location and run-out.

* National Incident-Based Reporting System-Volume 2: Data Submission Specifications, May 1992 edition