All > Technology > GIS
The value of a surface at a particular x,y location (e.g., elevation). Often referred to as spot values or spot elevations.
- Browse Related Terms: breakline, continuous data, contour interval, digital elevation model (DEM), Digital Terrain Model (DTM), drape, functional surface, geometry, interpolation, mass point, morphology, planimetric data, profile, section line, spike, surface, surface model, TIN, Topography, Triangulated Irregular Network (TIN), z-value
All > Technology > GIS
An ANSI protocol standard for WAN (wide area network) information query and exchange to share library referencing requests via distributed electronic access to information.
- Browse Related Terms: American National Standards Institute (ANSI), Comité Consultatif Internationale de Télégraphique et Téléphonique (Consultative Committee on International Telephone and Telegraph) (CCITT), Federal Geodetic Control Committee (FGCC), International Organization for Standardization (ISO), Internet, ISO 8211, ISO 9000, ISO 9660, Open Software Foundation (OSF), SQL/MM, X.25, X.400, Z39.50
All > Technology > Telecommunications
A technique applied to a DS1 frame to ensure pulse density requirements are met, where bits 2 through 193 of each frame are scrambled to minimize the occurrence of all-zero octets. When an all-zero octet is contiguous to another octet with zeros and they would combine to violate the ones density requirement, an algorithm is invoked where some all-zero octets are replaced by an address chain. The reverse algorithms are performed by the receiving terminal.
- Browse Related Terms: acceptance test, acceptance testing, acceptance trial, alarm event, conformance test, event, measured blocking threshold, operations system, reference waveform, self-testing circuit, system administration, ZBTSI (zero-byte time slot interchange)
All > Technology > Search > SEO / Search Marketing
Non-commercial directory which was bought by Looksmart for $20 million, then abruptly shut down with little to no warning.
- Browse Related Terms: Ethical SEO, Google OneBox, Information Retrieval, Inktomi, ISP (Internet Service Provider), Live.com, Looksmart, Niche, Salton, Gerard, USENET, Vertical Search, Zeal
All > Technology > Search > SEO / Search Marketing
First launched in 1999, Zeal was a volunteer-built web directory which was bought by LookSmart for $20 million in October 2000. Combining the work from LooksmartÂs paid editors with that of volunteers, they wrote profiles of websites and submitted them in relevant subcategories of the Zeal database. The directory content was downloaded and used by Looksmart and its partners including MSN, Lycos and Altavista. To become a Zeal volunteer, one needed to pass an introductory level test prior to submitting website profiles and being able to edit other peopleÂs work. As one gained more experience and kudos, an editor was able to create and maintain special categories of interests. The more experienced editors called Zealots and Expert Zealots were responsible for developing community and assist those people called "Community Members". Zeal had volunteer members from all over the world including USA, United Kingdom, Australia, India, Spain, Switzerland, Japan and New Zealand. When MSN pulled from the relationship, ZealÂs traffic had declined considerably which lead to its closure on 28th March 2006.
- Browse Related Terms: Amazon.com, AOL, Channels, Channel listings, DMOZ, Dreamweaver, Inlinks, Portal, Yahoo!, Zeal - Volunteer Built Web Directory
All > Technology > Storage
Verb. To replace all blocks on a disk with zeros.
- Browse Related Terms: copy-on-write (COW), Cow, Data Center, DBN, disk block number (DBN), dump path, Dynamic Disk, IBG (InterBlock Gap), quota, Snapshot reserve, tree quota, Vsnap, zero
All > Technology > Telecommunications
: A bit-stuffing technique used with bit-oriented protocols to ensure that six consecutive "1" bits never appear between the two flags that define the beginning and the ending of a transmission frame. Note: When five consecutive "1" bits occur in any part of the frame other than the beginning and ending flag, the sending station inserts an extra "0" bit. When the receiving station detects five "1" bits followed by a "0" bit, it removes the extra "0" bit, thereby restoring the bit stream to its original value. Synonyms zero insertion, zero stuffing.
- Browse Related Terms: self-delineating block, Sentinel, zero insertion, zero stuffing, zero-bit insertion
All > Technology > Storage
A technology that uses the SCSI controller on the motherboard (instead of a SCSI controller on the RAID card) to enable hardware RAID on a motherboard.
- Browse Related Terms: BIOS (Basic Input Output System), Command Optimization, degraded mode, disk scrubbing, HostRAID, microprocessor, O.C.E. (Online Capacity Expansion), RAID 10 (mirrored disks in a striped set), RAID 50 (stripe across distributed parity RAID), RAID disk scrubbing, RAID Level Migration, RAID Levels, RAID Management Software, ROC (Raid on Chip), ROMB (RAID on Motherboard), SLED (Single Large Expensive Disk), Storage Controller, Zero-Channel RAID
All > Technology > Telecommunications
In a communication system, a point at which the reference level is 1 mW, i.e., 0 dBm. Note: The actual power level of the communications traffic is not necessarily 0 dBm. It is usually below the reference level. The reference is for system design and test purposes. Synonym zero transmission level point.
- Browse Related Terms: Accuracy, ambient noise level, Equal Level Echo Path Loss, fading distribution, net gain, relative transmission level, sensitivity, test tone, thermodynamic temperature, transmission level, transmission level point (TLP), volume unit (vu), zero dBm transmission level point (0 dBm TLP)
All > Technology > Telecommunications
In a single-mode optical fiber, the rate of change of dispersion, with respect to wavelength, at the fiber's zero-dispersion wavelength. Note 1: In silica-based optical fibers, the zero-dispersion wavelength occurs at approximately 1.3
m, but this wavelength may be shifted toward the minimum-loss window by the addition of dopants to the fiber material during manufacture. Note 2: Doubly and quadruply clad single-mode fibers have two zero-dispersion points, and thus two zero-dispersion slopes.
- Browse Related Terms: first window, material dispersion coefficient [M(λ)], minimum-dispersion window, minimum-loss window, net loss, second window, silica, silicon dioxide (SiO2), spectral window, third window, zero-dispersion slope, zero-dispersion wavelength
All > Technology > Telecommunications
In a single-mode optical fiber, the wavelength or wavelengths at which material dispersion and waveguide dispersion cancel one another. Note: In all silica-based optical fibers, minimum material dispersion occurs naturally at a wavelength of approximately 1.3
m. Single-mode fibers may be made of silica-based glasses containing dopants that shift the material-dispersion wavelength, and thus, the zero-dispersion wavelength, toward the minimum-loss window at approximately 1.55 m. The engineering tradeoff is a slight increase in the minimum attenuation coefficient. 2. Loosely, in a multimode optical fiber, the wavelength at which material dispersion is minimum, i.e., essentially zero. Synonym minimum-dispersion wavelength.- Browse Related Terms: first window, material dispersion coefficient [M(λ)], minimum-dispersion window, minimum-loss window, net loss, second window, silica, silicon dioxide (SiO2), spectral window, third window, zero-dispersion slope, zero-dispersion wavelength
All > Technology > Telecommunications
Synonym minimum-dispersion window.
- Browse Related Terms: chromatic dispersion, fiber dispersion, material dispersion, minimum-dispersion slope, minimum-dispersion wavelength, nonshifted fiber, optical dispersion, profile dispersion, waveguide dispersion, zero dispersion window
All > Technology > Telecommunications
See zero-bit insertion.
- Browse Related Terms: self-delineating block, Sentinel, zero insertion, zero stuffing, zero-bit insertion
All > Technology > Telecommunications
A decoder that yields an analog level of 0 dBm at its output when the input is the digital milliwatt signal. [47CFR] Note: The signal is a 1-kHz sine wave.
- Browse Related Terms: back-to-back connection, branching repeater, combinational logic element, common-mode rejection ratio (CMRR), equal-level patch bay, noise suppression, output rating, protection ratio, rated output power, receive-after-transmit time delay, receiver attack-time delay, sequential logic element, squelch, through-group equipment, vogad, zero-level decoder
All > Technology > Defense
The location of the center of a burst of a nuclear weapon at the instant of detonation. The zero point may be in the air or on or beneath the surface of land or water, dependent upon the type of burst; it is thus to be distinguished from ground zero.
- Browse Related Terms: COA, GBD, HOB, Induced Radioactivity, PAL, PWR, VVER, Zero Point
All > Technology > Search > Enterprise Search
A futile query; a query that returns 0 (no) results.
- Browse Related Terms: Alert engine, Alert query, Dynamic teaser, full-text index, index, Query and result processing, Query Syntax, Search terms, synonym dictionary, TF-IDF, weighted term search, Zero results
All > Technology > Telecommunications
See zero-bit insertion.
- Browse Related Terms: self-delineating block, Sentinel, zero insertion, zero stuffing, zero-bit insertion
All > Technology > Telecommunications
The elimination of nonsignificant zeros from a numeral.
- Browse Related Terms: base, binary element, binary exponential backoff, binary notation, binary number, binary-coded decimal interchange code, bit, bit position, modulo-2 addition, parity check, pure binary numeration system, two-out-of-five code, zero suppression