All > Technology > E-mail > Microsoft Email > Microsoft Exchange > Microsoft Exchange 2003
An Exchange component that is integrated with the message transfer agent (MTA) and can be configured to connect routing groups within Exchange, or to route messages to other X.400 systems. When handling communication between Exchange and other X.400 systems, it maps addresses and converts Exchange messages to native X.400 messages and vice versa. [Exchange 2003]
- Browse Related Terms: Address Rewrite, ADMD (administrative management domain), certificate, DSAccess, Exchange Stress and Performance 2003, Internet Key Exchange, IP address/TCP port combination, MTA (message transfer agent), MTA Check, P1 message header, proxy server, reverse proxy server, SMTP (Simple Mail Transfer Protocol), X.400 Connector
All > Technology > E-mail > Microsoft Email > Microsoft Exchange > Microsoft Exchange 5.5
An Exchange component integrated with the MTA that can be configured to connect sites within Exchange, or to route messages to foreign X.400 systems. [Exchange 5.5]
- Browse Related Terms: address space, Backbone, bridgehead server, connector, direct postoffice, directory replication bridgehead server, directory synchronization, Dynamic RAS Connector, Internet Mail Service, MAPI (Messaging Application Programming Interface), Microsoft Mail Connector, MTA (message transfer agent), routing table, Site Connector, target server, X.400 Connector
All > Technology > E-mail > Microsoft Email > Microsoft Exchange > Microsoft Exchange 5.5
Defines the standard interfaces of an electronic messaging system. These recommendations specify the structure of a message handling system, message structure and components, and the method used to transfer messages. [Exchange 5.5]
- Browse Related Terms: DR (delivery receipt), foreign system, gateway, information service, Mailbox, NDR (non-delivery report), NRN (non-read notification), profile, routing, RR (read receipt), SMTP (Simple Mail Transfer Protocol), X.400 Recommendations
All > Technology > E-mail > Microsoft Email > Microsoft Exchange > Microsoft Exchange 5.5
Networking software required to support X.400 server-to-server message transport. [Exchange 5.5]
- Browse Related Terms: control message, inbound host, Internet, Internet News Service, newsfeed, NNTP (Network News Transfer Protocol), organization, outbound host, USENET, USENET site, X.400 transport stack
All > Technology > Operating System > Microsoft Windows > Microsoft Windows Server > Microsoft Active Directory
A set of standards defining a distributed directory service, developed by the International Standards Organization (ISO).- Browse Related Terms: Attribute, Attributes, Classes, Domain Specific Contents, Generic Accounts, Namespace, Object identifier (OID), Schema, X.500
All > Technology > Security
The International Organization for Standardization/International Telecommunication Union Standardization Department (ISO/ITU-T) X.509 standard defined two types of certificates the X.509 public key certificate, and the X.509 attribute certificate. Most commonly (including this document), an X.509 certificate refers to the X.509 public key certificate.
- Browse Related Terms: CA (Certification Authority), certification, Certification Practice Statement (CPS), CRL (Certificate Revocation List), Duration, On-Line Certificate Status Protocol (OCSP), Online Certification Status Protocol (OCSP), public key infrastructure (PKI), Re-key (a certificate), Renew (a certificate), Update (a Certificate), X.509 Certificate, X.509 Public Key Certificate
All > Technology > Security
The public key for a user (or device) and a name for the user (or device), together with some other information, rendered unforgeable by the digital signature of the certification authority that issued the certificate, encoded in the format defined in the ISO/ITU-T X.509 standard.
- Browse Related Terms: CA (Certification Authority), certification, Certification Practice Statement (CPS), CRL (Certificate Revocation List), Duration, On-Line Certificate Status Protocol (OCSP), Online Certification Status Protocol (OCSP), public key infrastructure (PKI), Re-key (a certificate), Renew (a certificate), Update (a Certificate), X.509 Certificate, X.509 Public Key Certificate
All > Technology > Telecommunications
A protocol for network interworking which supports communication between adjacent networks and communication thru transit networks.
- Browse Related Terms: branching network, computer network engineering, Federal Networking Council (FNC), Fiber Distributed Data Interface (FDDI), network integrity, network loss, network reliability, port, request acknowledgment, shaping network, spur, telecommunication architecture, token-bus network, transit network identification, transit network section, X.75 Gateway Service
All > Technology > Telecommunications
Unassigned overhead bits. Transmitters should code these bits as zeros while receivers are required to be capable of ignoring the value contained in these bits. [T1.646-1995]
- Browse Related Terms: bit stuffing, error correction, maximum user signaling rate, multiplex aggregate bit rate, overhead communications, system overhead information, user overhead information, X-bits
All > Technology > Telecommunications
In facsimile systems, the effective recorded spot dimension measured in the direction of the recorded line. Note 1: By "effective recorded spot dimension" is meant the largest center-to-center spacing between recorded spots, which gives minimum peak-to-peak variation of density of the recorded line. Note 2: "X-dimension of recorded spot" implies that the facsimile equipment response to a constant density in the object (original) is a succession of discrete recorded spots.
- Browse Related Terms: flood projection, maximum keying frequency, multiple-spot scanning, picture black, picture white, raster scanning, scanning field, scanning line, scanning line frequency, scanning line length, scanning line period, scanning rate, simple scanning, spot projection, stroke speed, synchronizing, synchronizing signal, total line length, X-dimension of recorded spot, X-dimension of scanning spot, Y-dimension of recorded spot, Y-dimension of scanning spot
All > Technology > Telecommunications
In facsimile systems, the distance between the centers of adjacent scanning spots measured in the direction of the scanning line on the object. Note: The numerical value of the X-dimension of scanning spot depends upon the type of system.
- Browse Related Terms: flood projection, maximum keying frequency, multiple-spot scanning, picture black, picture white, raster scanning, scanning field, scanning line, scanning line frequency, scanning line length, scanning line period, scanning rate, simple scanning, spot projection, stroke speed, synchronizing, synchronizing signal, total line length, X-dimension of recorded spot, X-dimension of scanning spot, Y-dimension of recorded spot, Y-dimension of scanning spot
All > Technology > E-mail > Microsoft Email > Microsoft Exchange > Microsoft Exchange 2007
User-defined, unofficial header field that exists in the message header. X-headers are not specifically mentioned in RFC 2822, but the use of an undefined header field starting with "X-" has become an accepted way to add unofficial header fields to a message. Messaging applications, such as anti-spam, antivirus, and messaging server applications may add their own X-headers to a message. X-header fields are usually preserved but ignored by messaging servers and clients that don't use them. [Exchange 2007]
- Browse Related Terms: DSN (delivery status notification), In-Country/Region Number Format, International Number Format, message envelope, message header, missed call notification, pilot identifier, SCL (spam confidence level), SPF (sender policy framework), TCP (Transmission Control Protocol), UDP (User Datagram Protocol), voice message, voice message originator, X-header
All > Technology > Defense
All > Technology > Defense
A laser that generates a beam or beams of x-rays. Also called an "X- raser ."
- Browse Related Terms: ALBCS, Free Electron Laser (FEL), Gamma-Ray Laser, Laser Designator, Laser Detection and Ranging (LADAR), Laser Imaging Radar, Laser Optics, Laser Target Designating System, MBA, MBE, SLBD, X-Ray Laser (XRL)
All > Technology > Defense
Electromagnetic radiation of high energy, which results from either the release of energy from electrons changing orbits about the nucleus (discrete) or the inelastic collision of charged particles with the electromagnetic field of the nucleus. X-rays have wavelengths shorter than those in the ultraviolet region, e.g., less than 10E-6 cm or 100 Angstroms. Materials at very high temperatures (millions of degrees) emit such radiations; they are then called thermal x-rays. As generally produced by x-ray machines, they are " bremsstrahlung " resulting from the interaction of electron of 1 kilo electron-volt or more energy with a metallic target. (See Electromagnetic Radiation and Thermal X-Rays.)
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All > Technology > Telecommunications
Sets of data telecommunications protocols and interfaces defined by CCITT (now, ITU-T) Recommendations. Note: Some of the more common X.-series Recommendations are:
- X.25: A Recommendation for public packet switched communications between a network user and the network itself.
- X.75: A Recommendation for public packet switched communications between network hubs.
- X.400: An addressing scheme for use with e-mail.
- X.500: An addressing scheme for directory services.
- Browse Related Terms: administration, Federal Telecommunications System (FTS), network site, private NS/EP telecommunications services, public data network (PDN), public data transmission service, public land mobile network (PLMN), recognized operating agency (ROA), resale service, telecommunication administration, telecommunication sector, telecommunications facilities, voice grade, X.-series Recommendations
All > Technology > GIS
A system developed at MIT that allows applications to be displayed in windows and shared among different workstations and terminals. Available on all UNIX operating systems supported by ARC/INFO and ArcView. ARC/INFO and ArcView are X Windows-based applications. ARC/INFO or ArcView can be run on any X-compliant terminal or X Station on all supported UNIX platforms or on any PC or Macintosh through emulation software.
- Browse Related Terms: Dynamic Data Exchange (DDE), entity relationship diagram, long transaction, Object Linking and Embedding (OLE), Object Management Group (OMG), Open Database Communication (ODBC), Open Geodata Interoperability Specification (OGIS), OPEN LOOK, OSF/MOTIF, X Windows, X Windows/Motif
All > Technology > GIS
ARC/INFO and ArcView operate in the X Windows/Motif environment on all supported UNIX workstation platforms.
- Browse Related Terms: Dynamic Data Exchange (DDE), entity relationship diagram, long transaction, Object Linking and Embedding (OLE), Object Management Group (OMG), Open Database Communication (ODBC), Open Geodata Interoperability Specification (OGIS), OPEN LOOK, OSF/MOTIF, X Windows, X Windows/Motif
All > Technology > Telecommunications
Synonym altazimuth mount.
- Browse Related Terms: access contention, Accrediting Authority, article, asymmetrical modulator, attenuation rate, balanced signal pair, banner page, beeping, bookmark list, budgeting, buffer amplifier, call intensity, central processor, chain letter, collective address, communications base station, compiling program, control ball, exchange line, extra block, fan out, field tag, flexible disk, floppy disk, followup, managing system, message toll service, mission bit stream, modification detection, multiparty line, multiplexing equipment, multipoint, Net, network terminating interface (NTI), optoisolator, originator-to-recipient speed of service, path attenuation, picture, plane polarization, positive feedback, premodulation combining, profile dip, radio frequency interference (RFI), radiological monitoring, ray optics, reproducibility, right-hand rule, satellite Earth terminal, screened-host gateway, secondary surveillance radar, segregation, selection position, seven-bit byte, shock spectrum, signal conversion equipment, six-bit byte, slit source, sporadic E propagation, stationary wave, supervisor state, system blocking, systems analysis, three-bit byte, traffic unit, translating program, transmission window, unidirectional channel, upright position, usage, useful line, user service class, Web Crawler, wired community, x-y mount
All > Technology > GIS
An association of American and European vendors formed in 1984 to promote open systems.
- Browse Related Terms: Content Standards for Spatial Metadata (CSSM), Detailed Metadata, Digital Geospatial Metadata (DGM), Federal Information Processing Standards (FIPS), Government Open System Interconnection Protocols (GOSIP), Metadata, National Institute of Standards & Technology (NIST), Open GIS Consortium (OGC), Originator, Spatial Data Transfer Standard/Topological Vector Profile (SDTS/TVP), status, Summary Metadata, United States Federal Geographic Data Committee (FGDC), X-Open Consortium
All > Technology > GIS
CCITT recommendation/ISC standard for wide area networks.
- 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
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- All > Law > E-Discovery