access method


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Related to access method: direct access method, Indexed Sequential Access Method, Sequential access method

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 ?
In addition to GPRS, Mobile Office users can choose from three other access methods for the ultimate in convenience and flexibility.
If something in the server-attached storage changes, then all the applications that share the storage must manually change their access method.
By using Lockdown Enforcer to enforce policy for these VPN users, IT departments are able to apply consistent policy for users, regardless of access method or location to further enhance the end-user experience.
No matter which access methods are selected users will obtain identical views on their information store.
The invention in the 1950s of the magnetic disk storage device embodied in the RAMAC (Random Access Method of Accounting and Control) computer, changed information dissemination forever, yet few people realize it.
Dedicated to delivering secure, high-value products for the lowest cost, OTC is one of the most sought after brands in the pre-paid calling industry - synonymous with top quality and value, superior customer service and the most reliable network for both global and domestic calls, regardless of location or access method.
According to Verizon, it has made enhancements to the portfolio such as a Managed IP PBX service, local language interfaces, local ringtones, extended European availability and extra access methods.
The company offers mobile phone users three access methods.

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