access method


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access method

[′ak‚ses ‚meth·əd]
(communications)
The procedures required to obtain access to a communications network.
(computer science)
A set of programming routines which links programs and the data that these programs transfer into and out of memory.

access method

(networking)
1. The way that network devices access the network medium.

2. Software in an SNA processor that controls the flow of data through a network.

access method

A software routine that is part of the operating system or network control program which performs the storing/retrieving or transmitting/receiving of data. It is also responsible for detecting a bad transfer of data caused by hardware or network malfunction and correcting it if possible. See also access mode.

Disk Access Methods
Indexed access methods are widely used to keep track of records in a file and files on disk. The index is a table of contents with pointers to the location of each file on the disk or each record within the file. A common approach is the indexed sequential access method (ISAM), which uses an index in sequential order that points to records stored in random order. For fastest retrieval, there direct access methods convert the record's identifying field, such as account number, into a physical storage address. The pure sequential method may also be used if direct access is not required. See ISAM, direct access method and sequential access method.

Communications Access Methods
Local area network (LAN) access methods, such as CSMA/CD in Ethernet, transfer data to and from connected computers on the network. These methods reference layers 1 and 2 of the OSI model. See CSMA/CD.

Mainframe access methods, such as IBM's TCAM and VTAM, transfer data between a host computer and remote terminals. These routines place the data into frames with appropriate control codes and reference layers 3, 4 and 5 of the OSI model. See TCAM and VTAM.

Tape Access Methods
Tapes use the sequential access method (SAM), which keeps records in order by a key field such as account number. Each record must be compared to find the desired one. Modern drives allow fast forwarding to index points where different groups of records are stored. This provides a direct access capability to sections of the tape, although very slow by comparison to disks.
References in periodicals archive ?
VPN Support -- New inline support for SSL and IPSec VPNs enables enterprises to enforce endpoint policy regardless of access method or location, ensuring a consistent user experience.
Typically, every system and application for which access control is enforced has its own proprietary access methods and system-specific meanings for operations and objects.
com/developerzone) and offers software developers online access to relevant information, whether an overview or recent updates on development environments, access methods or platforms and tools.
In making the appropriate decision, the selector must consider not only the content and format of the product or item, but the equipment needs, access methods, purchase or lease options, and varying cost structures.
Each individual who is disabled needs to be assessed with a variety of computer access methods.
These files document the communication features, data organization and access methods implemented in a network node and have to be provided by the manufacturer of a CANopen device.
SQL 2000i provides both transactional and relational data access methods.
0, ADC brings to market a communication systems environment that adapts to changing network technologies and provides seamless interoperability of enhanced services between a variety of devices and access methods.

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