29-letter words containing h, a, i, l
- synchronous digital hierarchy — (communications, standard) (SDH) An international digital telecommunications network hierarchy which standardises transmission around the bit rate of 51.84 megabits per second, which is also called STS-1. Multiples of this bit rate comprise higher bit rate streams. Thus STS-3 is 3 times STS-1, STS-12 is 12 times STS-1, and so on. STS-3 is the lowest bit rate expected to carry ATM traffic, and is also referred to as STM-1 (Synchronous Transport Module-Level 1). The SDH specifies how payload data is framed and transported synchronously across optical fibre transmission links without requiring all the links and nodes to have the same synchronized clock for data transmission and recovery (i.e. both the clock frequency and phase are allowed to have variations, or be plesiochronous). SDH offers several advantages over the current multiplexing technology, which is known as Plesiochronous Digital Hierarchy. Where PDH lacks built-in facilities for automatic management and routing, and locks users into proprietary methods, SDH can improve network reliability and performance, offers much greater flexibility and lower operating and maintenance costs, and provides for a faster provision of new services. Under SDH, incoming traffic is synchronized and enhanced with network management bits before being multiplexed into the STM-1 fixed rate frame. The fundamental clock frequency around which the SDH or SONET framing is done is 8 KHz or 125 microseconds. SONET (Synchronous Optical Network) is the American version of SDH.
- take the law into one's hands — the principles and regulations established in a community by some authority and applicable to its people, whether in the form of legislation or of custom and policies recognized and enforced by judicial decision.
- the five heads of predicables — five Aristotelian classes of predicates namely genus, species, difference, property, and relation
- the northern ireland assembly — the devolved legislature of Northern Ireland, located at Stormont in Belfast
- throw cold water on something — to be unenthusiastic about or discourage something
- thyrotropin-releasing hormone — a small peptide hormone, produced by the hypothalamus, that controls the release of thyrotropin by the pituitary. Abbreviation: TRH.
- to draw a veil over something — If you draw a veil over something, you stop talking about it because it is too unpleasant to talk about.
- to have a learning disability — to be unable to reach the average standard of people of the same age group as regards intellectual and cognitive skills and performance
- to have the time of your life — If you have the time of your life, you enjoy yourself very much indeed.
- trichloromethyl chloroformate — diphosgene.
- trinitrophenylmethylnitramine — tetryl.
- until one is blue in the face — to the utmost degree; indefinitely
- variational graphics extended — (software) (VGX) Software developed by SDRC for use in 3D CAD solid modelling.
- virtual storage access method — (database) (VSAM) An IBM disk file storage scheme first used in S/370 and virtual storage. VSAM comprises three access methods: Keyed Sequenced Data Set (KSDS), Relative Record Data Set (RRDS), and Entry Sequenced Data Set (ESDS). Both IMS/DB and DB2 are implemented on top of VSAM and use its underlying data structures.
- windows hardware quality labs — (body, standard) (WHQL) A Microsoft body that produces and supports the Microsoft Hardware Compatibility Test kit for current Microsoft operating systems. Products are tested with the kit to ensure that they meet Microsoft standards for compatibility with Windows and to qualify to use the "Designed for Microsoft Windows" logos.
- yet another compiler compiler — (tool, language) (yacc) The LALR parser generator found on most Unix systems. Also, the language used to describe the syntax of another language to yacc (the program). Implementations: ayacc, YAY, perln-byacc, SASL-Yacc - "Yacc in SASL - An Exercise in Functional Programming", Simon Peyton-Jones, Software Prac & Exp 15:807-820 (1985). Mentions also a BCPL implementation. Yacc++ - 1990. An object-oriented rewrite of yacc, supports regular expressions, produces an LR1 grammar parser. Chris Clark, Compiler Resources Inc, +1 (508) 435-5016. MLYACC - Implementation and output in SML/NJ. ftp:research.att.com/dist/ml/75.tools.tar.Z. A version, by David Poole at Montana University has been retargeted to Turbo Pascal. See also Bison, yet another, Yet Another Yacc.
- you can't hear yourself think — If you say that you can't hear yourself think, you are complaining and emphasizing that there is a lot of noise, and that it is disturbing you or preventing you from doing something.