4-letter words containing sd
- asde — Airport Surface Detection Equipment: a radar system that is used by aircraft controllers to assist in the safe manoeuvring of aircraft on the ground
- asdf — Common fill-in word (where keyboards are used, which have these letters in horizontal sequence).
- asdl — Abstract-Type and Scheme-Definition Language
- dasd — Direct-Access Storage Device
- dhsd — Duplex High Speed Data
- dsdm — Dynamic Systems Development Method
- esd. — Esdras
- esda — Electrostatic Deposition Analysis: a technique used to check the sequence in which a statement written in police custody was made. The chronology of the statement is arrived at by the examination of indentations on subsequent pages
- esdi — Enhanced Small Disk Interface
- isde — Integrated Software Development Environment: equivalent to an IPSE.
- isdn — (communications) (ISDN) A set of communications standards allowing a single wire or optical fibre to carry voice, digital network services and video. ISDN is intended to eventually replace the plain old telephone system. ISDN was first published as one of the 1984 ITU-T Red Book recommendations. The 1988 Blue Book recommendations added many new features. ISDN uses mostly existing Public Switched Telephone Network (PSTN) switches and wiring, upgraded so that the basic "call" is a 64 kilobits per second, all-digital end-to-end channel. Packet and frame modes are also provided in some places. There are different kinds of ISDN connection of varying bandwidth (see DS level): DS0 = 1 channel PCM at 64 kbps T1 or DS1 = 24 channels PCM at 1.54 Mbps T1C or DS1C = 48 channels PCM at 3.15 Mbps T2 or DS2 = 96 channels PCM at 6.31 Mbps T3 or DS3 = 672 channels PCM at 44.736 Mbps T4 or DS4 = 4032 channels PCM at 274.1 Mbps Each channel here is equivalent to one voice channel. DS0 is the lowest level of the circuit. T1C, T2 and T4 are rarely used, except maybe for T2 over microwave links. For some reason 64 kbps is never called "T0". A Basic Rate Interface (BRI) is two 64K "bearer" channels and a single "delta" channel ("2B+D"). A Primary Rate Interface (PRI) in North America and Japan consists of 24 channels, usually 23 B + 1 D channel with the same physical interface as T1. Elsewhere the PRI usually has 30 B + 1 D channel and an E1 interface. A Terminal Adaptor (TA) can be used to connect ISDN channels to existing interfaces such as EIA-232 and V.35. Different services may be requested by specifying different values in the "Bearer Capability" field in the call setup message. One ISDN service is "telephony" (i.e. voice), which can be provided using less than the full 64 kbps bandwidth (64 kbps would provide for 8192 eight-bit samples per second) but will require the same special processing or bit diddling as ordinary PSTN calls. Data calls have a Bearer Capability of "64 kbps unrestricted". ISDN is offered by local telephone companies, but most readily in Australia, France, Japan and Singapore, with the UK somewhat behind and availability in the USA rather spotty. (In March 1994) ISDN deployment in Germany is quite impressive, although (or perhaps, because) they use a specifically German signalling specification, called 1.TR.6. The French Numeris also uses a non-standard protocol (called VN4; the 4th version), but the popularity of ISDN in France is probably lower than in Germany, given the ludicrous pricing. There is also a specifically-Belgian V1 experimental system. The whole of Europe is now phasing in Euro-ISDN. See also Frame Relay, Network Termination, SAPI.
- jsdk — Java Servlet Development Kit
- lssd — level-sensitive scan design
- mcsd — Microsoft Certified Solution Developer
- musd — Doctor of Music
- nsdi — National Spatial Data Infrastructure
- oosd — Object-oriented structured design: a design method elaborated from structured design and incorporating the essential features of the object-oriented approach.
- psdn — (communications) Public Switched Data Network.
- ptsd — PTSD is an abbreviation for post-traumatic stress disorder.
- sdlc — 1. (communications) Synchronous Data Link Control. 2. (programming) Systems Development Life Cycle.
- sdlp — Social Democratic and Labour Party
- sdms — A query language.
- sdrc — (company) The company behind VGX.
- sdrs — special drawing rights
- sdsl — Single-line Digital Subscriber Line
- ulsd — Ultra Low Sulphur Diesel
- usda — United States Department of Agriculture
- usdi — United States Department of the Interior: a US government department that is responsible for the conservation and management of federal land and for programmes that pertain to insular areas and Native Americans
- wsdl — Web Service Definition Language
- wssd — World Summit on Sustainable Development, an intergovernmental conference held in Johannesburg in 2002
On this page, we collect all 4-letter words with SD. It’s easy to find right word with a certain length. It is the easiest way to find 4-letter word that contains SD to use in Scrabble or Crossword puzzles.