(1) Acronym for synchronous data link control, a communications protocol used in IBM’s SNA networks. SDLC is similar to HDLC, an ISO standard.
(2) Acronym for system development life cycle. SDLC is the process of developing information systems through investigation, analysis, design, implementation and maintenance. SDLC is also known as information systems development or application development. SDLC is a systems approach to problem solving and is made up of several phases, each comprised of multiple steps:
The software concept – identifies and defines a need for the new system
A requirements analysis – analyzes the information needs of the end users
The architectural design – creates a blueprint for the design with the necessary specifications for the hardware, software, people and data resources
Coding and debugging – creates and programs the final system
System testing – evaluates the system’s actual functionality in relation to expected or intended functionality.
(3) Acronym for software development life cycle (SDLC) and also synonymous with software process as well as software engineering, it is a structured methodology used in the development of software products and packages. This methodology is used from the conception phase through to the delivery and end of life of a final software product. See under software engineering.
- SDMA - spatial division multiple access
Short for spatial division multiple access, SDMA is a satellite communications mode for using data from antenna arrays in wireless communications systems. At the base station, SDMA continually adapts to the radio environment, providing each user with uplink and downlink signals of the highest possible quality. At the network level, this improved base station performance […]
Short for the Secure Digital Music Initiative, a forum comprised of more than 200 IT, consumer electronics, security technology, ISP and recording industry companies with the purpose of developing technology specifications that protect the playing, storing and distributing of digital music. Specifically, the goals of the SDMI were to provide consumers with convenient access to […]
Short for Session Description Protocol, a protocol that defines a text-based format for describing streaming media sessions and multicast transmissions. SDP is not a transport protocol but a method of describing the details of the transmission. For example, an SDP file contains information about the format, timing and authorship of the transmission, name and purpose […]
Short for Synchronous DRAM, a type of DRAM that can run at much higher clock speeds than conventional memory. SDRAM actually synchronizes itself with the CPU’s bus and is capable of running at 133 MHz, about three times faster than conventional FPM RAM, and about twice as fast EDO DRAM and BEDO DRAM. SDRAM is […]
Short for Standard Definition Television it is a type of digital television operation method which is able to transmit and produce images which are of a higher quality than standard analog broadcast. SDTV is typically a 480i signal – where 480 represents the vertical resolution and i represents interlaced. Digital cable and digital satellite programming […]