Unreferenced stub auto yes date December 2009 A publicdatanetwork is a telecommunications networknetwork established and operated by a telecommunications administration, or a recognized private operating agency, for the specific purpose of providing data transmission services for the public. See also Packet switched networkPublicdata transmission service Category Networks Telecomm stub zh ... more details
Unreferenced stub date December 2009 Orphan date December 2009 A public switched datanetwork PSDN is a publicly available packet switched network , distinct from the PSTN . Originally this term referred only to Packet Switch Stream PSS , an X.25 based packet switched network, mostly used to provide leased line connections between local area network s and the Internet using permanent virtual circuit s PVCs . Today, the term may refer not only to Frame Relay and Asynchronous Transfer Mode ATM , both providing PVCs, but also to Internet Protocol IP , GPRS , and other packet switching techniques. Whilst there are several technologies that are superficially similar to the PSDN, such as Integrated Services Digital Network ISDN and the Digital Subscriber Line DSL technologies, they are not examples of it. ISDN utilizes the PSTN circuit switched network, and DSL uses point to point circuit switching communications overlaid on the PSTN local loop copper wires , usually utilized for access to a packet switched broadband IP network. See also packet switching DEFAULTSORT Public Switched DataNetwork Category Data transmission Category Packets information technology Telecomm stub id SKDP ... more details
Network neutral data centers are commercial buildings or carrier hotel s where multiple telecommunication carriers can house their network equipment for the primary purpose of accessing and developing network connections with one another. Network neutral data centers are operated and supported by a neutral, third party provider. Location, size and power of these data center s vary, but all handle the exchange of traffic that originates on one network to terminate on another. ref Jason Schafer, Carrier neutral Colocation 2009. Tier1 Research ref References reflist Category Data management ... more details
The Defense DataNetwork DDN was a separate instantiation of the ARPANET used by the United States Department of Defense from 1983 1995 for its Internet services. The DDN began as the MILNET , a network formed in 1983 when military sites split off the public ARPANET. ref http www.cybertelecom.org notes internet history80s.htm 83 Cybertelecom Internet History 1983 ref As a large scale, private internet, the DDN provided Internet Protocol connectivity across the United States and to US military bases abroad. Throughout the 1980s it expanded as a set of four parallel military networks, each at a different security level. These networks transitioned to become the NIPRNET , SIPRNET , and JWICS networks in the 1990s. The four DDN subnetworks were Military Network MILNET for Unclassified traffic Defense Secure Network One DSNET 1 for Secret traffic Defense Secure Network Two DSNET 2 for Top Secret traffic Defense Secure Network Three DSNET 3 for Top Secret Sensitive Compartmented Information TS SCI MILNET and DSNET 1 were common user networks, much like the public Internet, but DSNET 2 was dedicated to supporting the Worldwide Military Command and Control System WWMCCS and DSNET 3 was dedicated to supporting the DOD Intelligence Information System DODIIS . References references See also ARPANET MILNET Category Wide area networks Category Internet access Category History of telecommunications Category Defense Advanced Research Projects Agency es Red de Datos de la Defensa ... more details
The Global Data Synchronisation Network GDSN is an internet based, interconnected network of interoperable data pools and a global registry known as the GS1 Global Registry, that enables companies around the globe to exchange standardised and synchronised supply chain data with their trading partners using a standardised Global Product Classification . GDSN assures that data exchanged between trading partners is accurate and compliant with universally supported standards. GDSN consists of supplier retailer trading partner, data pools that hold and process trading partner data and the GS1 Global Registry, a directory that helps locate data sources and keep relationships between trading partners in sync. Global identification numbers The Global Location Number GLN and the Global Trade Item Number GTIN are the global identification numbers in the GDSN. The GLN is the identifier for Legal entity legal entities , trading partners and locations while the GTIN is the identifiers for trade items. ref http www.epcglobalinc.org about media centre EPCglobal and GDSN v4 0 Final.pdf EPCglobal The EPCgloabal Network and the The Global Data Synchronization Network GDSN ref Footnotes reflist External links http www.gs1.org productssolutions gdsn GS1.org Website http www.computerworld.com action article.do?command viewArticleBasic&articleId 9007000&source NLT AM&nlid 1 Article on Walmart s GS1 Participation Category Logistics Category Technology computer stub ko fi GDSN ... more details
DTN , formerly known as Data Transmission Network , is a subscription based service for the delivery of real time weather , agriculture agricultural and commodity markets information. DTN is also the name of the service s parent company. DTN s primary users are agriculture producers, professionals in weather sensitive industries and commodities exchanges commodities and futures exchange futures traders. DTN provides information to professionals in agriculture, refined fuels, commodities and futures trading, public safety, aviation, turf, recreation, construction and transportation. The company delivers market information, commodity cash prices, industry news and analysis, and location specific weather for more than 120,000 subscribers working in agriculture, refined fuels, market trading and weather forecasting. DTN is especially targeted toward those interested in trading in markets such as futures and commodities and is popular among many farmers as well for its real time weather data. Meteorlogix is a part of DTN which forecasts for several divisions of weather, including Aviation, Energy, Transportation and the PGA Tour . Meteorlogix Division Meteorlogix is the weather division of DTN that forecasts location specific weather for several industries. Meteorlogix is the official forecaster for the PGA Tour . DTN The Progressive Farmer Agriculture Division DTN The Progressive Farmer is an agricultural information services provider to the North American corn, soybean, and cattle complex. History Based in Omaha , Nebraska DTN was originally founded in 1984 as Dataline, later changing their name to Data Transmission Network. In the company s early days, DTN delivered data to its customers solely by way FM radio broadcast, later adding dedicated, one way Ku Band satellite based ... area network LAN using Ethernet . Third party software is used to display and interpret the data ... links http www.dtn.com Official DTN website http www.worlddatasource.com dtn.html World Data Source ... more details
The Joint DataNetwork JDN is an interconnected computer networknetwork of Joint Tactical Information Distribution System JTIDS based systems, which links air and missile defense command and control and weapons systems across Military of the United States United States armed forces . It provides a set of near real time data communication s and information system s to facilitate situational awareness and the exchange and summary of Extended Air Defense engagement operations data such as the Medium Extended Air Defense System to centralized command centers, via inter computer data and radio communications exchange protocols. JDN s backbone protocol is based on the NATO standard Link 16 Link 16 , although other data links and platforms are also integrated, or planned for integration. References Cite journal author Rushton, Richard T., Capt. year 2004 title Open Architecture the Critical Network Centric Warfare Enabler url http kcg inc.net OPNAV 766 docs NCWed2.doc format DOC computing DOC journal Proceedings of the United States Naval Institute volume 130 issue 7 pages pp.38 39 issn 0041 798X oclc 2496995 accessdate 2007 06 05 US mil stub Category Military radio systems Category Anti aircraft warfare Category Missile defense ... more details
NetworkData Representation NDR is an implementation of the presentation layer in the OSI model . External links http www.opengroup.org onlinepubs 9629399 chap14.htm NDR Specification Category Internet standards Category Internet protocols Category Presentation layer protocols compu stub ... more details
Unreferenced date June 2007 The Education Data Exchange Network EDEN is a set of K 12 statistical reports gathered from state agencies by the US Department of Education . Formerly known as Performance Based Data Management Initiative PBDMI , EDEN attempts to gather statistics from each state such as school populations within subgroups race, gender, etc. , graduation rates and school spending. EDEN data gathering is complicated by the fact that no data sent to federal agencies may contain private data about an individual student that would violate the Family Educational Rights and Privacy Act FERPA guidelines. So a state agency can not just send a list of students and their test scores. A reporting agency can only send a list of subgroups and counts if the counts are above a small number such as five. EDEN data sets consists of three types Statewide data often called State Education Agencies SEA District or regional data Local Education Agencies LEA School specific data There are XML representations of EDEN files as well as XML Schema W3C XML Schemas to validate these files. These files are available from the http www.ed.gov about inits ed pbdmi file specifications.html ED.Gov File Specifications site. EDEN does not yet comply with federal information exchange guidelines as outlined in ISO IEC 11179 specification nor does it follow the http xml.gov documents in progress developersguide.pdf Federal XML Developers Guide . In March 2005, the Secretary of Education, Margert Spellings abolished the office administering EDEN, along with other restructuring and consolidations in the department. http www.ed.gov about reports annual results2005 july05report.doc Perot Systems has taken over operation of EDEN, and combined EDEN with ED s data warehouse to produce EDFacts. The combined system resulted in costs savings, but EDEN still remains under a strict watch from the GAO as a high risk project. http www.gao.gov htext d06647.html See also http xml.gov documents in progress developersguide.pdf ... more details
Technical date September 2010 Aircraft DataNetwork ADN is a concept introduced by the ARINC Airline Electronics Engineering Committee AEEC in the ARINC 664 Specification. The specification proposes data networking standards recommended for use in commercial aircraft installations. The standards provide a means to adapt Commercial off the shelf COTS networking standards to an aircraft environment. It refers to devices such as bridges, switches, routers and hubs and their use in an aircraft environment. This equipment, when installed in a network topology, can provide effective data transfer and overall avionics performance. The ARINC 664 specification refers extensively to the set of data networking standards developed by the Internet community and IEEE. The specification also applies the concepts of Open Systems Interconnection OSI standards. The specification is organized in multiple parts, as follows Part 1 Systems Concepts and Overview Part 2 Ethernet Physical and Data Link Layer Specifications Part 3 Internet based Protocols and Services Part 4 Internet based Address Structure and Assigned Numbers Part 5 Network Domain Characteristics and Functional Elements Part 6 Reserved Part 7 Deterministic Networks this part is commonly referred to as the Avionics Full Duplex Switched Ethernet AFDX Specification Part 8 Upper Layer Protocol Services External links http www.arinc.com ARINC Web Page FAA Boeing s New 787 May Be Vulnerable to Hacker Attack http www.wired.com politics security news 2008 01 dreamliner security Use dmy dates date September 2010 Category Air traffic control Aviation stub Comm stub de AFDX fr Avionics Full DupleX ... more details
Orphan date February 2009 In telecommunication , a publicdata transmission service is a data transmission service that is established and operated by a telecommunication administration business administration , or a recognized private operating agency, and uses a publicdatanetwork . A publicdata transmission service may include Circuit Switched Data Packet switching packet switched , and leased line data transmission. References FS1037C Category Data transmission Category Telecommunications terms telecomm term stub ... more details
A public safety network is a wireless communications network used by emergency services organizations, such as police, fire and emergency medical services, to prevent or respond to incidents that harm or endanger persons or property. Many municipalities are turning to mobile computing and other networked applications to improve the efficiency of their workforce, including public safety personnel and first responders. ref citepaper title Wireless Mesh Networks for Public Safety url http www.belairnetworks.com resources pdfs WP 5FPublicSafety 5FBDMC00070 2DA01 2Epdf publisher belairnetworks.com accessdate 2008 02 27 ref Consequently, public safety workers are increasingly being equipped with wireless laptops, handheld computers, and mobile video cameras to improve their efficiency, visibility, and ability to instantly collaborate with central command, coworkers and other agencies. Video surveillance cameras and unattended sensors are becoming important tools to extend the eyes and ears of public safety agencies. A pilot study along the US Mexico border uses a wireless mesh network. ref citeweb title Mesh Network Bolsters Border Security url http www.govtech.com dc articles 126137 publisher govtech.com accessdate 2008 02 27 ref The need to access and share this vital new flow of data and images is driving investments in a new kind of network broadband wireless mesh networks using Wi Fi , WiMAX , and 4.9 GHz public safety radio frequencies. These networks are metropolitan or regional ... bandwidth with extremely high reliability, and support real time video, voice and data. See also MultiCol IEEE 802.11 Mesh networking Municipal broadband ColBreak Public safety Switched mesh Wireless LAN ColBreak Wireless network Wi Fi 802.16 EndMultiCol References reflist External links http www.yubasutterscan.com Yuba Sutter Colusa Tri County Public Safety Network Live scanner feed broadcast from the Central Sacramento Valley in California Category Wireless networking Category Network topology ... more details
The Montreal Public Libraries Network R seau des biblioth ques publiques de Montr al in French language French is the public library system on the Island of Montreal in Quebec , Canada . It is the largest French language public library system in North America . It also has items in English and other languages. Its central branch closed in March 2005 and the branch s collections were incorporated into the collections of the Grande Biblioth que . The municipally run Montreal Public Libraries Network as distinct from the provincial Biblioth que et Archives nationales du Qu bec , which is also located in Montreal and requires its own library card includes 67 libraries, including 44 libraries in the city of Montreal and 12 branches in other municipalities on the Island of Montreal. There are several additional branches which are privately funded public libraries within the system and which require a nominal membership fee. External links Portal Montreal http ville.montreal.qc.ca portal page? pageid 4397,6375618& dad portal& schema PORTAL Montr al Libraries Network http www2.ville.montreal.qc.ca biblio index.htm Montr al Libraries Network fr icon http www.mississauga.ca portal residents librarystatistics 2006 data from Canadian Urban Libraries Council Montreal coord missing Quebec Category Public libraries in Quebec Category Libraries in Montreal library stub montreal stub fr Biblioth ques publiques de Montr al ... more details
Expert subject Telecommunications date February 2009 A public land mobile network PLMN is a regulatory term in telecommunications. A PLMN is a telecommunications networknetwork that is established and operated ... or even fibre optic distributed SDH network between mobile base stations and central stations via SDH equipment ADMs with integrated IP network services. Introduction A public land mobile network .... A PLMN may be considered as an extension of a fixed network, e.g. the Public Switched Telephone Network ... and internet access. A public land mobile network may be defined as a number of mobile services ... technology de Public Land Mobile Network fr Public Land Mobile Network pl Public Land Mobile Network ... purpose of providing land Mobile phone mobile telecommunications services to the public. ref FS1037C ref A PLMN is identified by the Mobile Country Code MCC and the Mobile Network Code MNC . Each operator providing mobile services has its own PLMN. PLMNs interconnect with other PLMNs and Public switched telephone network s PSTN for Telephone telephone communications or with internet service provider s for data and internet access of which links are defined as interconnect links between ... network. This can be a special challenge in regions where the terrain is irregular, where base ... uses a Mobile phone cellular telephone knows, perfection has yet to be achieved. Public switched telephone network main Public switched telephone networkPublic Land Mobile Networks need to connect to the Public Switched Telephone Network PSTN in order to route calls. The PSTN is the world s collection of interconnected voice oriented public telephone networks, in much the same way that the Internet is the concentration of the world s public IP based packet switched networks. It is both ... of users, the access network as well. Because Internet Service Providers ISPs pay the long distance ... purposes such as the Defense Switched Network . There are also private networks run by large companies ... more details
The Public Health Information Network PHIN is a national initiative, developed by the Centers for Disease ... exchange of health data Protect the security of the health data exchanged Ensure that the network ... of electronic clinical data for public health purposes as an alternative to manual reporting. It is consistent ... in public health organizations. The initiative involves establishing and implementing a framework for public ... Data Analysis Knowledge Management Alerting Response The PHIN Framework PHIN will elevate and integrate the capabilities of public health information systems across the wide variety of organizations that participate in public health and across the wide variety of interrelated public health functional needs. PHIN is both a response to the needs for better integration among public health systems and a plan for developing systems and infrastructure to better support public health activities and improve public health outcomes. PHIN targets the support and integration of systems for disease surveillance, national health status indicators, data analysis, public health decision support, information resources and knowledge management, alerting and communications and the management of public ... and maintaining interconnected information systems throughout public health at the local, state and federal ... as the industry standards for clinical data messaging such as HL7. PHIN also aligns with the federal e Gov technical architecture standards such as ebXML and public key infrastructure PKI . See Standards Development Organizations for more information on national standards. PHIN s Impact on Public Health PHIN attempts to provide the public health sector with continuous access to necessary health care information. Access to near real time data attempts to improve community based interventions that are implemented ... improve the outcomes of various public health programs including the following The U.S. Department of Health and Human Services Desired outcome improving public health information systems. The Secretary ... more details
Unreferenced date December 2007 The public switched telephone network PSTN is the network of the world s public circuit switching circuit switched telephone network s. It consists of telephone line s, fiberoptic cable s, microwave transmission links, cellular network s, communications satellite s, and Undersea cable undersea telephone cables all inter connected by switching center s which allows any telephone in the world to communicate with any other. Originally a network of outside plant fixed line analog signal analog telephone systems, the PSTN is now almost entirely digital in its core and includes .... In the 1970s the telecommunications industry began implementing packet switched networkdata ... Commutada da Public Switched Telephone Network de Telefonnetz el Public switched telephone network ... he Public Switched Telephone Network lmo PSTN nl PSTN ja no PSTN pms PSTN pl Publiczna ... any other phone. History The first telephones had no network but were in private use, wired together ... network that connected most exchanges by the end of the 20th century. The growth of the PSTN meant ... services, known as the Broadband Integrated Services Digital Network B ISDN . The B ISDN vision ... network still use analog technology for anything other than the last mile local loop loop ... to the telephone company network operators . The first company to be incorporated to provide PSTN ... of telephone service was increasingly becoming an essential public utility . For example, the General ... to interconnection carry each others traffic . Technology in the PSTN Network topology main PSTN network topology The PSTN network architecture had to evolve over the years to support increasing ... a set of equipment collectively known as the access network . The access network and inter exchange ... network, there are a number of reference point s defined. Most of these are of interest mainly ... Service POTS Managed Facility Voice Network Category Telecommunications systems Category Telephony ... more details
infobox broadcast call letters Maine Public Broadcasting Network city station logo File Maine Public Broadcasting Network Logo.svg 200px station slogan More to Explore station branding MPBN analog digital ... TV 45 Ultra high frequency UHF subchannels x.1 Public Broadcasting Service PBS br x.2 PBS Satellite Service PBS HD br x.3 PBS World other chs affiliations Public Broadcasting Service PBS network founded ... below homepage http www.mpbn.net www.mpbn.net The Maine Public Broadcasting Network abbreviated MPBN is a television and radio broadcasting state networknetwork located in the state of Maine in the United States . It is operated by the Maine Public Broadcasting Corporation, which holds the licenses for all the Public Broadcasting Service PBS and National Public Radio NPR stations licensed in the state ..., Maine Bangor . MPBN s television network shows a block of PBS Kids , Public Broadcasting Service ... and Transmitter Shutdowns date December 18, 2008 work Maine Public Broadcasting Network accessdate ... Category Channel 45 digital TV stations in the United States simple Maine Public Broadcasting Network ... statewide Maine callsign meaning former callsigns former channel numbers owner Maine Public Broadcasting ... programs. MPBN s radio network airs news and talk programming from NPR, locally produced news ... . MPBN s television network is also carried on cable television cable in most of New Brunswick. History ... of southern Maine, with the original MPBN radio and television network operated by the University ... formed the original MPBN television network. One of these stations was WMEA TV in Biddeford, Maine ... itself and points north. WMEA was the flagship station for the now defunct Maine Public Television Plus, a secondary PBS service launched in the mid 1990s. UMaine brought public radio to the state ..., the Maine Public Broadcasting Corporation. The television stations adopted the on air name Maine Public ... Public Radio. In 2006, they reverted to the MPBN moniker. Controversy Unreferenced section date ... more details
Multiple issues unreferenced August 2010 Image pptn.jpg right Pennsylvania Public Television Network was the Pennsylvania state agency that funded and supported public television stations within the state of Pennsylvania . It s funding was eliminated in the Commonwealth of Pennsylvania s 2009 2010 budget and transferred to the Public Television Technology appropriation in the Executive Offices Office of Administration . Member Stations WLVT TV in Allentown WQED TV WQED in Pittsburgh WHYY TV and WYBE in Philadelphia WITF TV in Harrisburg WQLN TV WQLN in Erie WVIA TV in Scranton Wilkes Barre WPSU TV in State College References http www.pptn.state.pa.us Official website no longer exists PPTN Category PBS member networks ... more details
Internationals Network for Public Schools is an educational nonprofit supporting 12 International high schools, serving newly arrived immigrants, in New York and California. Mission The mission of Internationals Network is to provide quality education for recently arrived immigrants by growing and sustaining a strong national network of innovative International High Schools, while broadening our impact by sharing proven best practices and influencing policy for English learners on a national scale. History The International High School opened in 1985, a collaborative effort between the New York .... In 2004, the partnership gained non profit status and became Internationals Network for Public Schools. Since their inception, the Partnership and Network opened an additional 9 schools based upon the original model. ref http www.internationalsnps.org history.php Internationals Network History . ref The Network was initially funded in large part by a grant from the Bill and Melinda Gates Foundation , but the Network has since broadened its donor and grant base. Awards and recognition The Internationals ... Network and the Graduate Center of the City University of New York. The Stanford study, led by Linda Darling Hammond and her team of researchers, found the Internationals Network for Public Schools ... Internationals Network for Public Schools A Quantitative and Qualitative Cohort Analysis of Graduation ... at Union Square References reflist http www.internationalsnps.org Internationals Network for Public Schools Website DEFAULTSORT The Internationals Network For Public Schools Category International ... Redesign Network at Stanford University . ref Michelle Fine and a team of researchers from the Graduate ... Unum national awards for exceptional immigrant integration initiatives. Internationals Network for Public Schools was named for its work teaching late entry immigrant students. Students Today the network serves approximately 4,000 students annually from 90 countries. 86 percent of students come ... more details
Update date January 2011 The Classical Public Radio Network http www.classicalradio.org CPRN was a national, 24 hour classical music service. Its mission was to preserve, enhance and expand experience of classical music for radio listeners. With this vision, CPRN was established in 1998 as a limited liability non profit company a joint venture of KUSC Los Angeles and Colorado Public Radio with startup funding from the Corporation for Public Broadcasting . In 2003, CPRN and National Public Radio NPR joined in a collaborative marketing arrangement to further expand the network, but ceased national broadcast operations as of June 30, 2008. CPRN offered listeners the full spectrum of the classical repertoire from medieval times to the present complete symphonies and orchestral pieces, chamber works, opera selections, art songs, and choral works. The announcers and music staff programmed the music with a focus on core repertoire and superior recordings. Each announcer brought personal expertise to selecting featured music, alternate performances, artist tributes and unique recordings, as well as seasonal and date specific programming. Enhancing the 24 hour program stream were several weekly and daily shows and features. Weekdays, Kimberlea Daggy hosts The Daily Special at noon, and Charles Andrews unearths Buried Treasures at 8 00pm. On Sunday mornings, Stephanie Wendt presented Sacred Classics , featuring three hours of meditative music for the heart and mind. Contemporary classical music was explored every Saturday evening by Alan Chapman on Modern Masterpieces . The programming ... public radio stations KUSC , Los Angeles KVOD , Denver WBHM , Birmingham, AL KBSU FM , Boise, ID South Dakota Public Broadcasting , Vermillion, SD High Plains Public Radio, Garden City ... than one million listeners weekly. Programming was distributed to stations via the Public Radio Satellite System . Category American radio networks Category Public broadcasting in the United States ... more details
notability Organizations date August 2010 Infobox Non profit Non profit name Public Leadership Education Network PLEN Non profit logo File PLEN logo, 300 dip for blowing up.jpg 200px Non profit type founded date 1978 founder Frances Tartlon Sissy Farenthold location Washington, D.C. origins key people Barbara A. Shailor, Chair Ruth Knox, Secretary Treasurer Marianne Alexander, President Emerita area served product focus Women s leadership, Education method revenue endowment num volunteers num employees num members subsib owner Non profit slogan Preparing Women to Lead homepage http www.plen.org dissolved footnotes Public Leadership Education Network PLEN is a nonprofit organization based in Washington, D.C. . PLEN offers six annual seminars and a summer public policy internship to college women throughout the nation. Students meet and learn from women of influence in D.C. including members of congress, government and business leaders, presidential advisers and the heads of non profit and advocacy organizations. Membership Although roughly 40 of the women participating in PLEN programs come from coed colleges and universities, the majority of PLEN students come from member institutions, primarily women s colleges, which support PLEN through annual membership contributions. Member Institutions Cedar Crest College , Allentown, PA Chatham University , Pittsburgh, PA College of Notre Dame of Maryland , Baltimore, MD Douglass Residential College All Rutgers University students included , New Brunswick, NJ Mount Holyoke College , South Hadley, MA Mount St. Mary s College , Los Angeles, CA Newcomb College Institute at Tulane University , New Orleans, LA Smith College , Northampton, MA Spelman College , Atlanta, GA St. Catherine University , St. Paul, MN Wells College , Aurora, NY ... of State, Bureau of Public Affairs ref ref http www.wells.edu whatsnew wnnwar45.htm Wells College ... careerinsider.blogs.bucknell.edu 2010 09 03 women law public policy seminar in washington dc Bucknell ... more details
The Network Control Center Data System NCCDS is an element of NASA s Space Network SN ground segment. Collocated with the White Sands Tracking and Data Relay Satellite System , the NCCDS is the operations control facility for the network. It schedules most Space Network elements and supporting elements and provides interfaces for planning, acquisition, control, and status of the Space Network. The NCCDS is the point of contact between customers who have satellites in orbit and the Space Network for most scheduling and real time performance. A customer may obtain Space Network support by submitting specific schedule requests to or establishing generic requirements with the NCCDS. The NCCDS translates customers requirements into specific TDRS communications and tracking events. Additionally, the NCCDS notifies affected customers of scheduled system outages so that Mission Operation Centers MOCs can properly plan mission activities. Upon MOC request, the NCCDS provides operational performance information such as data presence monitoring indicators and data quality monitoring data on scheduled services during actual support to determine if conditions exist that will affect data quality. The NCCDS issues Network Advisory Messages NAMs to provide up to date information on network conditions and constraints. These messages are accessible via the NCCDS active NAM web site. The Goddard Space Flight Center uses the NAMs as a means of letting customers know of any performance constraints associated with the TDRS spacecraft. References Space Network User s Guide SNUG , 450 SNUG, Rev 9. NASA centers Category Goddard Space Flight Center ... more details
, as the Tracking and Data Relay Satellite System TDRS , took over most of the work of tracking satellites .... Jan. 12, 1980 , p. 27. ref Another network, the Deep Space Network DSN , interacted with manned craft ... primary mission of data collection from deep space probes. External links http ntrs.nasa.gov archive ... http www.bfec.us bfectxt8.htm Network stations list Notes reflist Category Goddard Space Flight ... more details
Self Similarity Of NetworkData Analysis Category Computer network analysis ...Multiple issues wikify January 2010 orphan January 2010 Self similarity is a special feature of networkdata. When operating networkdata, the traditional time series models, for example an autoregressive moving average model ARMA p, q , are not appropriate. Since it only provides a finite parameters model, but the networkdata usually has Long range dependency long range dependent structure. Thus, a self similar process for describing the networkdata structure is applied. In the following paragraphs, we mention the definitions of the self similar processes and some properties of them. At the same time, we describe some important methods for graphing and estimating the self similarity of networkdata. Definition Suppose math X math be a Stationary process Weaker forms of stationarity weakly stationary 2nd order stationary process with mean math mu math , variance math sigma 2 math , and autocorrelation function math gamma t math . Assume that the autocorrelation function math gamma t math has the form math gamma t rightarrow t beta L t math as math t to infty math , where math 0 beta 1 math and math L t math is a slowly varying function at infinity , that is math lim t to infty frac L tx L t 1 math for all math x 0 math . For example, math L t const math and math L t log t math are slowly varying functions. br Let math X k m frac 1 m H X km m 1 cdot cdot cdot X km math , where ... math N math divide the time series data into math k math groups each of size math frac N k math , compute math frac R S n math for each group. br Thus for each n we have math k math pairs of data math ... There are two common problems when we apply the periodogram method. First, if the data does not follow a Gaussian distribution, transformation of the data can solve this kind of problems. Second, the sample ... time series , Art. Mat. 2, 423 434, 1953. K. PARK,W. WILLINGER, Self Similar Network Traffic ... more details
Public Use Micro Data Sample Areas, or PUMAs, is a division of US States into census area which each contain around 100,000 people. All such areas are non overlapping and partition a State. There are a total of 2,071 PUMAs. The State governments drew the PUMA boundaries for the 2000 Census , to allow reporting of detailed data for all areas. For example the American Community Survey publishes detailed data every year, but due to their sampling procedure only publishes data for census area that have more than 65,000 People. PUMAs allow the publishing of census data for most sub state areas. For example, only seven of the 55 counties of West Virginia are large enough to receive estimates from the 2006 ACS. In contrast, all 12 PUMAs that partition West Virginia will receive 2006 ACS estimates. See also Census tract Census block References http www.census.gov acs www Downloads Handbook2006.pdf Category United States Census Bureau geography ... more details
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