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Directory Assistance Service
The Directory Assistance Service (DAS) is an obsolete protocol and service for accessing X.500 directory services. DAS was intended to provide a lightweight means for clients to access X.500 directory services via a split-Directory User Agent model. Here, the Directory User Agent (DUA) (the directory client) is split into a Directory Assistance (DA) client and a Directory Assistant. The directory user would interact with the DA-client, the DA-Client would communicate with the Directory Assistant using the DA protocol, and the Directory Assistant would communicate with the Directory Service using the X.500 Directory Access Protocol (DAP). That is, the Directory Assistant is a Directory Assistance protocol to DAP gateway. This design allows the DA-client to access the directory without requiring it to support the cumbersome Open Systems Interconnection protocol stack. The Directory Assistance Service was created in 1990 by Marshall Rose while at Performance Systems Internation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communications Protocol
A communication protocol is a system of rules that allows two or more entities of a communications system to transmit information via any kind of variation of a physical quantity. The protocol defines the rules, syntax, semantics and synchronization of communication and possible error recovery methods. Protocols may be implemented by hardware, software, or a combination of both. Communicating systems use well-defined formats for exchanging various messages. Each message has an exact meaning intended to elicit a response from a range of possible responses pre-determined for that particular situation. The specified behavior is typically independent of how it is to be implemented. Communication protocols have to be agreed upon by the parties involved. To reach an agreement, a protocol may be developed into a technical standard. A programming language describes the same for computations, so there is a close analogy between protocols and programming languages: ''protocols are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Service (systems Architecture)
In the contexts of software architecture, service-orientation and service-oriented architecture, the term service refers to a software functionality, or a set of software functionalities (such as the retrieval of specified information or the execution of a set of operations) with a purpose that different clients can reuse for different purposes, together with the policies that should control its usage (based on the identity of the client requesting the service, for example). OASIS defines a service as "a mechanism to enable access to one or more capabilities, where the access is provided using a prescribed interface and is exercised consistent with constraints and policies as specified by the service description". |
Open Systems Interconnection
The Open Systems Interconnection model (OSI model) is a conceptual model that 'provides a common basis for the coordination of SOstandards development for the purpose of systems interconnection'. In the OSI reference model, the communications between a computing system are split into seven different abstraction layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application. The model partitions the flow of data in a communication system into seven abstraction layers to describe networked communication from the physical implementation of transmitting bits across a communications medium to the highest-level representation of data of a distributed application. Each intermediate layer serves a class of functionality to the layer above it and is served by the layer below it. Classes of functionality are realized in all software development through all and any standardized communication protocols. Each layer in the OSI model has its own well-defined functio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marshall Rose
Marshall T. Rose (born 1961) is a network protocol and software engineer, author, and speaker who has contributed to the Internet Engineering Task Force (IETF), the Internet, and Internet and network applications. More specifically, he has specialized in network management, distributed systems management, applications management, email, the ISO Development Environment (ISODE), and service-oriented architecture (SOA). Rose holds a Ph.D. in Information and Computer Science from the University of California, Irvine and is former area director for network management of the IETF. Rose is presently Principal Engineer at Brave (web browser). IETF Rose's work on behalf of the Internet Engineering Task Force has included: * Area Director for network management, 1993-1995. * Chair, MARID, MTA Authorization Records in DNS. IETF working group, Applications area. Concluded September 2004. * Chair, OPES, Open Pluggable Edge Services. IETF working group, Applications area. * Chair, POP, Post ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PSINet
PSINet, based in Northern Virginia, was one of the first commercial Internet service providers (ISPs) and was involved in the commercialization of the Internet until the company's bankruptcy in 2001 during the dot-com bubble and acquisition by Cogent Communications in 2002. It was founded on December 5, 1989, and began offering services, including limited for-profit access to the Internet, on January 1, 1990, becoming one of the first companies to sell Internet connectivity. History Founding PSINet was founded in 1989 by Martin L. Schoffstall and William L. Schrader, who initially funded the company through personal loans, including using credit cards and by selling the family car. It was initially known as Performance Systems International. In very late 1989, the company acquired NYSERNet assets and established an ongoing outsourcing contract with NYSERNet. NYSERNet, a non-profit research and education network serving New York State, had created one of the first regional Int ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ISO Development Environment
The ISODE software (pronounced eye-soo-dee-eee), more formally the ''ISO Development Environment'', was an implementation of the OSI upper layer protocols, from transport layer to application layer, which was used in the Internet research community to experiment with implementation and deployment of OSI during the late 1980s and early 1990s. The ISODE software was initially a public domain / open source implementation, led by Marshall Rose. Following version 6.0, Marshall handed the lead over to Colin Robbins and Julian Onions, who coordinated the 7.0 and 8.0 releases. Version 8.0 was the final public domain release, made on June 19, 1992. The Open Source version is still available, even if only for historic interest. The software was ported to a wide set of Unix and Linux variants. ISODE Stack The ISODE stack was an implementation of layers 3 to 6 of the OSI model. While the ISODE implementation could be configured to use one of several X.25 (CONS) or connectionless low ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colin Robbins (software Engineer)
Colin Robbins (born 1964) is a network protocol and software engineer credited for research work in distributed directory systems and a co-inventor of LDAP. Educated at Alleyn's School, he holds a BSc, Computer Science & Electronic Engineering, with first class honours, from University College London. Robbins developed the Quipu directory part of the ISO Development Environment (ISODE) while a research assistant at UCL working for Peter Kirstein, he became custodian of ISODE from Marshall Rose in 1991. Quipu was used to prototype DIXIE and DASED, which merged to invent LDAP of which Robbins wrote the ''String Representation of Standard Attribute Syntaxes'' element defined in RFCs 1448 and 1778 published by the IETF. Robbins wrote part 3 of Steve Kille's book ''Implementing X.400 and X.500: the PP and QUIPU Systems''. Robbins was the Technical Architect and Vice-Chairman of the Europe-wide Nameflow Paradise directory, the world’s largest distributed deployment of X. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University College London
, mottoeng = Let all come who by merit deserve the most reward , established = , type = Public research university , endowment = £143 million (2020) , budget = £1.544 billion (2019/20) , chancellor = Anne, Princess Royal(as Chancellor of the University of London) , provost = Michael Spence , head_label = Chair of the council , head = Victor L. L. Chu , free_label = Visitor , free = Sir Geoffrey Vos , academic_staff = 9,100 (2020/21) , administrative_staff = 5,855 (2020/21) , students = () , undergrad = () , postgrad = () , coordinates = , campus = Urban , city = London, England , affiliations = , colours = Purple and blue celeste , nickname ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DIXIE
Dixie, also known as Dixieland or Dixie's Land, is a nickname for all or part of the Southern United States. While there is no official definition of this region (and the included areas shift over the years), or the extent of the area it covers, most definitions include the U.S. states below the Mason–Dixon line that seceded and comprised the Confederate States of America, almost always including the Deep South. The term became popularized throughout the United States by songs that nostalgically referred to the American South. Region Geographically, ''Dixie'' usually means the eleven Southern states that seceded from the United States of America in late 1860 and early 1861 to form the Confederate States of America. They are listed below in order of secession: # South Carolina # Mississippi # Florida # Alabama # Georgia # Louisiana # Texas # Virginia # Arkansas # North Carolina # Tennessee Although Maryland is rarely considered part of Dixie today, it is below the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lightweight Directory Access Protocol
The Lightweight Directory Access Protocol (LDAP ) is an open, vendor-neutral, industry standard application protocol for accessing and maintaining distributed directory information services over an Internet Protocol (IP) network. Directory services play an important role in developing intranet and Internet applications by allowing the sharing of information about users, systems, networks, services, and applications throughout the network. As examples, directory services may provide any organized set of records, often with a hierarchical structure, such as a corporate email directory. Similarly, a telephone directory is a list of subscribers with an address and a phone number. LDAP is specified in a series of Internet Engineering Task Force (IETF) Standard Track publications called Request for Comments (RFCs), using the description language ASN.1. The latest specification is Version 3, published aRFC 4511ref name="gracion Gracion.com. Retrieved on 2013-07-17. (a road map to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
