No footnotes date April 2009 Paracrine signaling is a form of cell signaling in which the target cell is near para near the signal releasing cell. Local action Some signaling molecules degrade very quickly, limiting the scope of their effectiveness to the immediate surroundings. Others affect only nearby cells because they are taken up quickly, leaving few to travel further, or because their movement is hindered by the extracellular matrix . Citation needed date September 2009 Examples Growth factor and clotting factor s are paracrine signaling agents. The local action of growth factor signaling plays an especially important role in the development of tissues. Also, retinoic acid , the active form of vitamin A , functions in a paracrine fashion to regulate gene expression during embryonic development in higher animals. ref name Duester cite journal last1 Duester first1 G title Retinoic acid synthesis and signaling during early organogenesis journal Cell volume 134 issue 6 pages 921 31 year 2008 month September pmid 18805086 pmc 2632951 doi 10.1016 j.cell.2008.09.002 ref In insects, Allatostatin controls growth though paracrine action on the corpora allata. In mature organisms, paracrine signaling is involved in responses to allergen s, tissue repair, the formation of scar tissue , and blood clotting . Citation needed date September 2009 Autocrine and endocrine actions Testosterone secreted from the testes acts as an endocrine agent to stimulate peripheral events, such as muscle growth, and as a paracrine agent to stimulate spermatogenesis in the adjacent seminiferous tubules . Citation needed date September 2009 Histamine also serves as a paracrine See also Endocrine system References Reflist External links MeshName Paracrine Signaling eMedicineDictionary Paracrine DorlandsDict six 000078100 paracrine GPnotebook 1335164869 Cell signaling Category Signal transduction Cell biology stub de Parakrine Sekretion es Efecto paracrino fr Paracrine ko it Paracrino he ... more details
Paracrine regulator is a Cell biology cell of group of cells from the Diffuse neuro endocrinesystem Diffuse Neuro Endocrine System DNES that produces amine s or peptide s. External link http www.jhc.org cgi reprint 27 10 1398.pdf DNES Category Cell biology Biology stub ... more details
Unreferenced date January 2007 Main article Signalling telecommunications The term compelled signalling refers to a class of telecommunications signalling protocols where receipt of each discrete signal needs to be explicitly acknowledged before the next signal is able to be sent. For example, in R2 signalling R2 register signalling , the transmission of each signal involves the following five events The outgoing trunk begins sending the tones that correspond to the signal it wishes to convey in the forward direction The incoming trunk, once it is sure to have correctly detected the above signal, begins sending a set of confirmation tones in the backward direction The outgoing trunk, once it is sure to have correctly detected the confirmation tones, stops sending the signal tones in the forward direction The incoming trunk, once it is sure to have detected the end of the signal tones that is that the forward channel is now silent stops sending its confirmation tones in the backward direction Before being able to begin sending the next signal, if any, the outgoing trunk needs to ensure that it is receiving silence on the backward channel. The term is only relevant in the case of signalling systems that use discrete signals e.g. a combination of tones to denote one digit , as opposed to signalling systems which are message oriented, such as Signaling System 7 SS7 and ISDN Q.931, where each message is able to convey multiple items of information e.g. multiple digits of the called telephone number . The contrary of compelled signalling is referred to as non compelled signalling. An example includes DTMF , where the originating side sends tones and silence in the forward direction, without being able to ascertain whether each tone has been correctly received by the terminating side. In order to minimise the risk of signalling errors, minimum durations are imposed, both on the tones and on the intervening periods of silence. DEFAULTSORT Compelled Signalling Category Telephony ... more details
of Signalling System R2 ref is a 1950s and 1970s era Channel Associated Signaling channel associated signallingsignalling protocol used outside of the former Bell System to convey information along ... R2 line signalling and R2 register signalling . Information conveyed along an R2 signalled trunk A signalling ... of R2 signalling protocols conveys at least the following, where forward is the direction from ... style font size 90 style font size 1.25em R2 at a glance valign top align left width 125pt R2 signalling Line signalling R2 line signalling valign top acquisition termed seizure of an idle DS0 channel valign top align left width 125pt R2 signalling Register signalling R2 forward register signalling ... top align left width 125pt R2 forward register signalling valign top the digits 1 through 10 of the origin ... register signalling valign top the digits 11 through 14 for special service requests e.g., route to operator, add echo suppression valign top align left width 125pt R2 forward register signalling ..., coin operated telephone valign top align left width 125pt R2 forward register signalling valign top ... top align left width 125pt R2 line signalling valign top the called party has now lifted the handset from its hook to answer this call attempt in order to transition from R2 signalling toward the establishment ... left width 125pt R2 line signalling valign top the release of the call e.g., the handset of the called ... top align left width 125pt R2 backward register signalling valign top the set of explicit requests corresponding to each of the forward register signalling data. The client server requesting of each ... requests from the calling party s switch. Line signalling R2 line signalling is a family of protocols ... R2 line signalling was represented as electrical pulses on a two wire or four wire Telecommunication ... trunk. Register signalling R2 register signaling is a family of protocols that govern the conveyance ... in that E1. Standards R2 signalling refers to a vast number of variants of R2 that resemble each ... more details
Autocrine signaling is a form of signaling in which a cell secretes a hormone or chemical messenger called the autocrine agent that binds to autocrine receptors on the same cell , leading to changes in the cell. ref Pandit, Nikita K. Introduction to the pharmaceutical sciences , page 238, 2007 ref This can be contrasted with paracrine signaling , intracrine signaling, or classical endocrine signaling. Examples An example of an autocrine agent is the cytokine interleukin 1 in monocytes . When interleukin 1 is produced in response to external stimuli, it can bind to cell surface receptor biochemistry receptors on the same cell that produced it. Citation needed date October 2009 Another example occurs in activated T cell lymphocytes , i.e., when a T cell is induced to mature by binding to a peptide MHC complex on a professional antigen presenting cell and by the B7 protein B7 CD28 costimulatory signal. Upon activation, low affinity Interleukin 2 IL 2 receptors are replaced by high affinity IL 2 receptors consisting of , , and chains. The cell then releases IL 2, which binds to its own new IL 2 receptors, causing self stimulation and ultimately a monoclonal population of T cells. These T cells can then go on to perform effector functions such as macrophage activation, B cell activation, and cell mediated cytoxicity . Citation needed date October 2009 See also Paracrine signaling Intracrine Endocrine system External links GPnotebook 2140799033 MeshName Autocrine signaling http www.sysbio.org research bsi cellsignal ligand.stm Autocrine versus juxtacrine signaling modes illustration at sysbio.org References reflist Cell signaling Category Signal transduction Cell biology stub de Autokrine Sekretion es Liberaci n autocrina fr Communication autocrine it Autocrino pl Wydzielanie autokrynowe pt Aut crino sv Autokrin ... more details
Image Notchccr.gif thumb Notch signaling Notch mediated juxtacrine signal between adjacent cells. In biology, juxtacrine signaling is a type of Cell signaling intercellular communication that is transmitted via oligosaccharide , lipid , or protein components of a cell membrane, and may affect either the emitting cell or the immediately adjacent cells. It occurs between adjacent cells that possess broad patches of closely opposed plasma membrane linked by transmembrane channels known as connexon s. The gap between the cells can usually be between only 2 and 4 nm. Unlike other types of cell signaling such as paracrine and endocrine , juxtacrine signaling requires physical contact between the two cells involved. Juxtacrine signaling has been observed for some growth factor s, cytokine and chemokine cellular signals. See also Notch signaling Extracellular matrix Integrin Gap junction External links http www.ncbi.nlm.nih.gov books bv.fcgi?rid dbio.section.1089 Juxtacrine Signaling in Developmental Biology by Scott F. Gilbert eMedicineDictionary Juxtacrine http www.sysbio.org research bsi cellsignal ligand.stm Autocrine versus juxtacrine signaling modes illustration at sysbio.org Cell signaling Category Cell signaling Cell biology stub ... more details
italictitle for the phenomena cell signaling Infobox journal cover editor Miles Houslay discipline Cell signaling abbreviation Cell. Signal. publisher Elsevier country Netherlands frequency Monthly history 1989 present openaccess license impact 4.305 impact year 2008 website http www.elsevier.com wps find journaldescription.cws home 525462 description description link1 http www.sciencedirect.com science journal 08986568 link1 name Online access link2 link2 name RSS http rss.sciencedirect.com publication science 4922 atom JSTOR OCLC 38522928 LCCN CODEN ISSN 0898 6568 eISSN boxwidth Cellular Signalling is a Peer review peer reviewed scientific journal focusing on various aspects of cell signaling . Indexing Cellular Signalling is indexed in columns list 2 BIOBASE BIOSIS Biological & Agricultural Index Biological Abstracts Cambridge Scientific Abstracts Chemical Abstracts Current Awareness in Biological Sciences Current Contents Life Sciences EMBASE EMBiology Elsevier BIOBASE Genetics Abstracts MEDLINE Research Alert SCISEARCH Science Citation Index Scopus journal stub Category Molecular and cellular biology journals Category Publications established in 1989 ... more details
from the cab of a steam locomotive Railway signalling is a system used to control railway traffic safely ... of interlocked block signalling and other safety measures as a direct result of the Armagh rail disaster in that year. Most forms of Signalling block systems train control involve movement ... and lanterns. Wayside signalling dates back as far as 1832, and used elevated flags or balls that could ... American operating methods is given below. Block signalling main Signalling block systems Image ... forms the basis of most railway safety systems. History of block signalling On double tracked ... the Armagh rail disaster . This required block signalling for all passenger railways, together with interlocking , both of which form the basis of modern signalling practice today. Similar legislation ..., it is common to use token railway signalling token systems that rely on the train driver s physical .... Entering and leaving a manually controlled block Absolute block signalling as is required by UK ... to describe the signalling system being overridden by train order and doesn t describe permissive ... signalling, signals indicate whether or not a train may enter a block based on automatic train detection ... points. On timetable, train order, and token railway signalling token based systems, blocks usually start and end at selected stations. On signalling based systems, blocks start and end at signals ... the distance required to stop the train. In signalling based systems with closely spaced signals ... early days of railway signalling, the first coloured lights associated with the turned signals ... as shown by the lights on mechanical signals during darkness. Route signalling and speed signallingSignalling of British origin generally conforms to the principle of route signalling . Most railway systems around the world, however, use what is known as speed signalling . Under route signalling ... on lesser used diversionary routes to keep their route knowledge up to date. Under speed signalling ... more details
of information? Assuming there is a signalling equilibrium under which the sender signals ... down? A basic job market signalling model In the job market, potential employees seek to sell their services ... diagram Image Simple signalling framework.PNG The increase in wages associated with obtaining a higher ... does not equate the fact that higher wages are paid to more educated individuals entirely to signalling ... of signalling indicate it as a statistically significant determinant of wages, however it is one of a host ... of the existence of a pure signalling value to education is that public funding of education ... population the private value of the signal would be excluded. Signalling and IPOs Leland and Pyle ... more details
systems, a train protection system is usually overlaid on top of the cab signalling system to warn ... Underground Victoria Line , and form the basis for the first generation Shinkansen signalling developed by Japan National Railways JNR . Hierarchy of cab signal systems With a traditional signalling ... does not actively prevent the unsafe conditions from arising. Modern cab signalling is an active ... systems are also considered a form of cab signalling. Intermittent Image Metro North Cab Sigal.jpg ... LZB in Germany and the LGV signalling TVM series in France do have this capability. LZB and TVM ... is to use the absence of a magnetic field to designate a hazardous condition. ref Railway Signalling A guide to modern signalling technology, Institution of Railway Signal Engineers. Published 1980 ... information, but can be cheaper and simpler to design and implement. Typology of cab signalling ... track circuit systems for cab signalling and automatic train control with speed enforcement. Florida ... Cab signalling systems in the US Cab signalling in the United States was driven by a 1922 ruling by the Interstate Commerce ... Signaling pulse code cab signalling technology supplied by Union Switch and Signal . In response ... in the current era have been of this type. Recently there have been several new types of cab signalling ... train speed as necessary. References Reflist Railwaysignalling DEFAULTSORT Cab Signalling Category Railway signalling de F hrerstandssignalisierung fr Signalisation en cabine ja pl Sygnalizacja ... more details
dablink For the analogous theory in economics , see signalling economics . Not to be confused with signal theory , a concept in engineering . Within evolutionary biology , signalling theory is a body of Theory Theories as models theoretical work examining communication between individuals. The central question is when organisms with conflicting interests should be expected to communicate honestly . Mathematical models in which organisms signal their condition to other individuals as part of an evolutionarily stable strategy are the principal form of research in this field Citation needed date August 2009 . Sexual selection In sexual selection, traits are selected for via the pressure of mate selection, and signalling can be one of those traits. For example, the male Hyla versicolor gray tree frog , Hyla versicolor , produces a call which is used to attract a female. Once the female chooses a male, this selects for a specific style of male calling, thus propagating a specific signalling ... offspring conflict. Nature 376, 133 ref ref Johnstone, R.A. 2002 Signalling of need, sibling ..., interesting process. An example of dishonest signalling comes from Fiddler crabs such as Uca lactea ... in immune function and signalling. ref Lozano, G. A. 1994. Carotenoids, parasites, and sexual selection ... results. A series of papers by Getty ref Getty, T. 1998 Handicap signalling when fecundity and viability do not add up. Anim. Behav. 56, 127 130 ref ref Getty, T. 1998 Reliable signalling need not be a handicap .... 205 625&ndash 630 ref proposed the idea that autumn leaf color is due to the trees signalling to aphid ... et al. 2001 . See also Signalling economics Animal communication Cheap talk Signalling game Autumn leaf color Handicap principle , a hypothesis explaining why honesty in signalling would prevail ... octavia.zoology.washington.edu handicap An Introduction to the Theory of Honest Signalling http www.animalbehavioronline.com deceit.html DEFAULTSORT Signalling Theory Category Animal communication ... more details
protein Name agouti signaling protein, nonagouti homolog mouse caption image width HGNCid 745 Symbol ASIP AltSymbols AGTIL EntrezGene 434 OMIM 600201 RefSeq NM 001672 UniProt P42127 PDB ECnumber Chromosome 20 Arm q Band 11.2 LocusSupplementaryData q12 Agouti signalling peptide , also referred to as Agouti, is a peptide consisting of 131 amino acids. Its discovery was published in 1994 in the scientific journal Nature magazine Nature where its functional properties were described. It acts as an inverse agonist at melanocortin receptor s, specifically, melanocortin 1 receptor MC1 . ref name pmid7935841 cite journal author Lu D, Willard D, Patel IR, Kadwell S, Overton L, Kost T, Luther M, Chen W, Woychik RP, Wilkison WO, et al title Agouti protein is an antagonist of the melanocyte stimulating hormone receptor journal Nature volume 371 issue 6500 pages 709 802 year 1994 month October pmid 7935841 pmc doi 10.1038 371799a0 url issn ref It is produced by the Agouti gene ASIP . ref name pmid7937887 cite journal author Kwon HY, Bultman SJ, L ffler C, Chen WJ, Furdon PJ, Powell JG, Usala AL, Wilkison W, Hansmann I, Woychik RP title Molecular structure and chromosomal mapping of the human homolog of the agouti gene journal Proc. Natl. Acad. Sci. U.S.A. volume 91 issue 21 pages 9760 4 year 1994 month October pmid 7937887 pmc 44896 doi 10.1073 pnas.91.21.9760 url issn ref ref name pmid7757071 cite journal author Wilson BD, Ollmann MM, Kang L, Stoffel M, Bell GI, Barsh GS title Structure and function of ASP, the human homolog of the mouse agouti gene journal Hum. Mol. Genet. volume 4 issue 2 pages 223 30 year 1995 month February pmid 7757071 doi 10.1093 hmg 4.2.223 url issn ref Function In mice, the agouti gene encodes a paracrine signaling molecule that causes hair follicle melanocyte s to synthesize melanin Pheomelanin pheomelanin , a yellow pigment, instead of the black or brown pigment, melanin Eumelanin eumelanin . Pleiotropic effects of constitutive expression of the mouse ... more details
Orphan date August 2008 Data over signalling , ref Also spelled Data over signaling . ref or DoS, is a telecommunications term that refers to sending primary data over a Signalling telecommunications signalling channel , instead of the User telecommunications subscriber s bearer channel . ref cite web url http www.google.com patents?id CPMoAAAAEBAJ title US Patent 5,490,251 accessdate 2008 08 21 author Clark et al. date 1996 02 06 ref ref cite web url http www.google.com patents?id K CTAAAAEBAJ title US Patent Application Publication 2005 0249146 A1 accessdate 2008 08 21 author Pinault et al. date 2005 11 10 ref Background Data over signalling was designed as a solution to the problem of transceiving simultaneous voice and data . Data over signalling can be utilized when the signalling channel is either Channel Associated Signaling channel associated or Common Channel Signaling common . However, it is easier to implement when the signalling channel is channel associated, as the system does not have to demultiplex the data and signalling between multiple subscribers. DoS was designed so that mobile telephony subscribers could maintain a voice session on their bearer channel while still accessing data related services, such as text messaging . References and notes reflist See also Simultaneous voice and data ITU V.70 V.70 V.61 Category Telecommunications telecomm term stub ... more details
unreferenced date February 2011 Orphan date January 2011 See also UK railway signalling When the idea of the railway first was brought to light, it quickly became apparent that a method of controlling the flow of rail traffic was needed to avoid collision and other incidents. In the UK , the different railway companies came up with many differing ideas but by the 1870s, almost all the rail network had a standard signalling system the semaphore. Originally, these were of lower quadrant design, but were eventually replaced by upper quadrants due to operating advantages see below . Today, semaphore signalling has been mostly phased out by Colour light signalling , however, there are still several locations where semaphore is still dominant. Category Rail infrastructure in the United Kingdom Category Railway signalling by country United Kingdom ... more details
Non Facility Associated Signalling or NFAS is a Primary Rate Interface configuration whereby multiple T carrier T1 carriers share a Signalling telecommunication signaling channel or D channel . A T1 circuit typically carries 24 individual timeslot s. Each timeslot in turn carries a single telephone call . When a T1 circuit is used to carry Primary Rate ISDN one of the timeslots is used to carry the D channel. A single Primary Rate ISDN circuit is thus sometimes described as 23B D. There are 23 bearer channel s carrying voice or data, and one D channel carrying the Common Channel Signaling . In an NFAS configuration, multiple T1 circuits share a single D channel, with an upper limit of 20 T1 circuits in a single NFAS configuration. A full NFAS configuration can then be described as 479B D. There is one problem a failure on the T1 trunk carrying the D channel will also affect all 19 other trunks. The solution is D channel backup where a second D channel is configured on another trunk. In the event of failure the backup D channel takes over the signalling. So the final configuration is 478B D D backup. NFAS is a cost cutting measure. Customers ordering a Primary Rate ISDN service will be charged for each Signalling telecommunication signaling channel. Therefore an NFAS configuration can be cheaper than Facility Associated Signalling, due to historical reasons. North American switches such as the Lucent 5ESS switch 5ESS , and the Nortel Digital Multiplex System DMS 100 did not handle common channel signalling such as ISDN on the same line card that terminated the T1 circuit. So, the telephone company needs to buy and maintain a separate signalling card for every D channel. The situation ..., one timeslot is used for synchronization, and one timeslot is used to carry the signalling channel. The line cards in switches designed for the E1 system already include processing for the signalling timeslot. As a result, Non Facility Associated Signalling is rarely used with E carrier. Category ... more details
Orphan date February 2009 Notability date October 2008 Double Line Automatic Signalling is a form of railway signal ling utilised on the majority of Double track double line sections in New Zealand . Double Line Automatic Signalling utilises track circuit s to detect the presence of trains in sections broken up by intermediate Railway signal signals . Usually there is an up and a down main line, and beyond station limits the lines are not Bi directional railway signalling bi directionally signalled . At junctions or points, one of or both mains signals are usually controlled either remotely by a Train Controller or Signalmen or switched in at a local panel. Sidings off one or both mains are usually operated by switchlock lever points secured by padlock and track circuit presence that enables a release to be given before points can be operated. Areas of use Swanson New Lynn Avondale Boston Rd Britomart Westfield via Penrose Britomart Amokura via Waterfront Te Kauwhata Hamilton. Trentham Kaiwharawhara Kaiwharawhara South Junction North Junction Paekakariki, Islington Heathcote Formerly double line Islington Rolleston Mosgiel St Leonards Category Railway signalling ... more details
The amplitude modulation signalling system AMSS or the AM signalling system is a digital system for adding low bit rate information to an analog signal analogue amplitude modulation amplitude modulated broadcasting broadcast signal in the same manner as the Radio Data System RDS for frequency modulation frequency modulated FM broadcast signals. This system has been standardized in March 2006 by ETSI TS 102 386 as an extension to the Digital Radio Mondiale DRM system. Broadcasting AMSS data are broadcasted from the following transmitters longwave LW RTL France 234 kHz medium wave MW BBC World Service 648 kHz Deutschlandradio Kultur 990 kHz shortwave SW BBC World Service 15575 kHz Formerly it was also used by medium wave MW Truckradio 531 kHz External links cite web url http www.drm.org uploads media spec 21.pdf format PDF, 100 197 bytes title ETSI TS 102 386 v1.2.1 2006 03 Technical Specification Digital Radio Mondial DRM AM signalling system AMSS publisher ETSI month March year 2006 accessdate 2009 12 07 Dead link date October 2010 bot H3llBot http pda.etsi.org pda home.asp?wki id 4S,,jR gRTlnpntrSi4Ru ETSI TS 102 386 V1.2.1 2006 03 directly from ETSI Publications Download Area account or free registration required cite web last1 Murphy first1 Andrew last2 Poole first2 Ranulph url http tech.ebu.ch docs techreview trev 305 murphy.pdf format PDF, 172 312 bytes title The AM Signalling System AMSS does your radio know what it s listening to? publisher EBU work EBU technical review month January year 2006 cite web author Lindsay Cornell url http www.broadcastpapers.com whitepapers ABUBBCamss2006.pdf title The AM Signalling System AMSS format PDF, 183KiB publisher http www.broadcastpapers.com whitepapers The AM Signalling System AMSS .cfm?objid 32&pid 790&fromCategory 47 Broadcast Papers date January 29, 2007 Audio broadcasting Category Radio technology Category Broadcast engineering ca AMSS da AM Signalling System de AMSS fr Amplitude Modulation Signalling System ... more details
unreferenced date December 2008 Infobox Company company name Thales Rail Signalling Solutions Inc company logo Image with inadequate rationale removed Image Thales.svg 200px company type Publicly traded location Paris , France key people industry Rapid Transit Railway signal Signalling products SelTrac revenue operating income net income num employees 2000 parent Thales Group subsid homepage http www.thalesgroup.com markets Activities Ground Transportation train control2.html footnotes THALES Rail Signalling Solutions Inc. is a subsidiary of THALES Group. TAS supplies transportation automation solutions for railway from its head office in Paris and railway business divisional center in Stuttgart, Germany, Vienna, Austria, and mass transit business divisional center in Toronto, Canada. Their major train control products are SelTrac communication based train control for mass transit , ETCS , and LZB . Additionally TAS sells electronic interlocking systems, axle counters that can replace track circuits, various types of point machine s, and railway worker protection systems. History The original moving block signaling system for rapid transit was introduced by Urban Transportation Development Corporation a Crown Corp in Ontario and was successfully implemented for the Scarborough RT in Toronto, Ontario which was successfully opened in 1985. UTDC was later absorbed by Bombardier Transportation Bombardier train Manufacturing and Alcatel Rail Signaling Solutions In April, 2006, Thales Group announced it would be acquiring Alcatel s space business 67 of Alcatel Alenia Space and 33 of Telespazio , and Alcatel s Rail Signalling Solutions division in a deal which also raised Alcatel s ownership of Thales to 21.66 percent. Products SelTrac External links http www.thalesgroup.com Portfolio Security Train control 28CBTC 29 Category Train protection systems fr Thales Rail Signalling Solutions ... more details
OSE signalling History File SEK style semaphore.jpg thumb right 120px Old style semaphore main signal ... , signalling was not installed until World War II. There were few trains running and all traffic control ... II and are almost identical to the German railway signalling Home signal distant signal H V H V signalling ..., but they are no longer operational. Local signalling using two aspect colour light signals controlled ... Peloponnese station, Inoi junction etc. All aspects of railways signalling are described in the current ... semaphore signals and lineside signs, with appendices covering new signalling systems. It was issued ... include Main body Traditional signs and signals, reflecting signalling and operating practices as they were around 1970. Appendix I Colour light signalling in Thessaloniki Railway Complex New Passenger Station and Shunting Yard . Appendix II Colour light signalling system initially installed in Thessaloniki Platy and Athens Inoi sections. Appendix III Current colour light signalling system and procedures. Appendix IV Special local signalling systems in Edessa Station and at Kalamata Engine Shed junction. Appendix V Level crossing signalling system lang el . Appendix VI Recently introduced signs for electrified lines. Semaphore signalling Semaphore signals followed the German pattern ..., covering the entrance to stations and are described in Chapter II of the Signalling Regulation. There were ... later, with the introduction of the current signalling system. class wikitable Signal OSE Code Meaning ... based on the GSM R technology which shall also carry ETCS Level 1 cab signalling. The GSM R system ... Gazette Issue B 399 2006, pages 4911 4912. ref Modern signalling File Railway signal LIA10.JPG .... This line is using block signalling with centralized control from a small number of signal boxes Appendix III of Signalling Regulation . Signals are four aspect colour light signals, which are described ... the colour light signalling is functional on the following sections Acharnai Railway Center ... more details
Summary This is a simple two person signalling model. It is optimal for the higher ability person to obtain more education but not for the lower ability individual. One can see that the cost benefit structure for a signal to be effective must fall within certain bounds or else the system will fail. I drew this myself in mspaint, do whatever you want with it, I don t care. Licensing PD self date September 2008 ... more details
gauge s, the different states have tended to go their own way regarding railway signalling practice. New South Wales Railway signals in New South Wales broadly follow British route signalling practice ... be found at the same interlocking locations. Systems of train signalling New South Wales signalling ... Wales Regulations for Train Signalling by Block Telegraph on Double Lines, 1967 ref The last of these instruments ... and Wingello, New South Wales Wingello on the Main South line in 2007. By 1907, the majority of signalling ... s Branch supplanted McKenzie & Holland as the principal supplier in most installations. Power signalling Power signalling arrived in 1910 in Sydney Yard. This installation was electro pneumatic and controlled ... remains the standard system of train signalling on all main lines in the RailCorp network. Absolute ... the signalling system. It was replaced by the first installation of the Divisible Miniature Electric Staff system in 1933. ref Dargan, James Safe Signals A History of N.S.W. Railway Signalling, 1989 ... Light signalling was thus established by a sequence of Distant and two arm signals, so that it was then possible ... Wales Railways through its introduction of power signalling, from 1911 until 1929. ref Dargan, James Safe Signals A history of N.S.W. Railway Signalling, 1989 ref At night, two lights, one above ... colour light Double Light Colour Light signalling is essentially a two light multiple aspect route signalling ... yellow. This equates to the double yellow in British multiple aspect signalling. Facing junction signals ... Railways, II The Signalling System, Institution of Engineers, Australia, 1926 ref However, medium ... in speed may be necessary, this is not consistent with conventional route signalling practice. Turnout and junction signals are the most inconsistent and diverse in the NSW signalling system. Reduced ... directly from British multiple aspect signalling, with American influence in the form of a marker ... Rail Authority of New South Wales Basic Safeworking Manual Safeworking Signalling Manual, 1993 ref The red ... more details
about the Depression, Anxiety and Stress Scale DASS DASS psychology the Defensive Aid Sub System of an aircraft Defensive Aids System The Digital Access Signalling System DASS is the United Kingdom Proprietary protocol proprietary standard created by British Telecom to provide ISDN services in the United Kingdom. The first incarnation DASS1 is now obsolete and has been replaced by DASS II. This itself will become obsolete over the coming years as Q.931, a Europe an standard becomes widely adopted in BT Group Category British Telecom Category Integrated Services Digital Network technology stub ... more details
Incomplete date February 2009 An overlap in railway signalling is the length of track beyond a Railway signal stop signal that is proved to be clear of vehicles in the controls of the previous signal, as a safety margin. Overview Enough braking distance is provided to allow a train to comfortably stop at the stop signal, but should it fail to do so for any reason slippery rail s, brake failure, inattention by driver, etc. there is still some distance to allow the train to stop short of any obstruction, such as another train. Length The length of an overlap may be a nominal length, or else calculated on the full emergency braking distance for the gradients and speeds for that particular section of line. Two signal protection If the overlap is long enough to extend from one stop signal to the next, then the effect is to provide two signal protection or double blocking , with the first signal having a full overlap, and the second signal having a short overlap. With two signal protection, only one track circuit is needed between successive signals. However, overlaps may then be longer than is necessary with an adverse effect on headway, should headway be important on that section of line. With one signal protection, there may be two track circuits between successive signals, which has a cost, however headways can be optimised. Country practice Overlap design vary widely with signalling practice in different countries and types of Automatic Warning System AWS and Automatic Train Protection ATP . Many countries do not use overlaps at all. Category Railway signalling rail stub de Durchrutschweg ... more details
Merge to Flag signals date November 2010 Naval flag signalling covers various forms of flag signalling, such as semaphore or Flaghoist signalling flaghoist , used by various navies distinguished from maritime flag signalling by merchant or other non naval vessels or flags used for identification. History Naval flag signalling undoubtably developed in antiquity in order to coordinate naval action of multiple vessels. In the Peloponnesian War 431 &ndash 401 BCE squadrons of Athenian galleys were described by Thucydides as engaging in coordinated maneuvers which would have required some kind of communication ref Harvnb Thucydides . ref there is no record of how such communication was done but flags would have been the most likely method. Flags have long been used to identify a ship s owner or nationality, or the commander of a squadron. But the use of flags for signalling messages long remained primitive, as indicated by the 1530 instruction that when the Admiral blockquote doth doth shote of a pece of Ordnance, and set up his Banner of Council on Starrborde bottocke of his Shippe, everie shipps capten shall with spede go aborde the Admyrall to know his will. ref Harvnb Wilson 1986 , p.77, quoting from W. G. Perrin, British flags Cambridge, 1922 . ref blockquote Several wars with the Dutch in the 17th century prompted the English to issue instructions for the conduct of particular ... service . ref Harvnb Marryat 1847 ref Marryat s Maritime flag signalling Marryat s Code of Signals ... officer is on board. Flaghoist signalling Flaghoist was the only way ships could signal prior to the advent of radio and signal lamp blinking light . Even now it is often the preferred method of signalling ... a famous flag signal . Maritime flag signalling Semaphore Signal lamp International Code of Signals ... Flag Signalling at Sea Captain Barrie Kent Nice article. http www.crwflags.com fotw flags xf nsf.html ... signalling flags. http www.globalsecurity.org military library policy navy nrtc Signalman 3 & 2 ... more details
Merge to Flag signals date November 2010 Maritime flag signalling , generally flaghoist signalling , is the principal means other than radio by which ships communicate to each other or to shore distinguished from flags showing nationality, ownership, or for naval vessels organizational status. Virtually all signalling by non naval vessels whether by flaghoist signalling flaghoist , semaphore , signal lamp , or other means is now organized under the International Code of Signals , which specifies a standard set of flags and codes naval vessels generally use an extended set of flags and their own codes. This article will touch on the historical development of maritime flag signalling. Early developments In the Middle Ages the use of signals to communicate between ships was primitive, as seen by one admiral s instructions to his fleet in 1530 blockquote Whensoever, and at all tymes the Admyrall doth shote of a pece of Ordnance, and set up his Banner of Council on Starrborde bottocke of his Shippe, everie shipps capten shall with spede go aborde the Admyrall to know his will. ref Harvnb Wilson 1986 , p.77, quoting from W. G. Perrin, British flags Cambridge, 1922 . ref blockquote By 1653 the Royal Navy had issued instructions by which an admiral could signal various orders by hoisting flags in various locations on his ship. History of communication Distance telecommunications Modern use of naval code signaling begun with the invention of maritime signal flags in the mid 17th century ... . ref Previous systems were primarily naval. The first general system of signalling for merchant ... wanting It was not international. It was found that when signalling word by word, the occasions ... signalling International Code of Signals Naval flag signalling References citation ref CITEREFICS1931 ... from Brown s Signalling 1916 , showing earliar version of ICS. http www.nga.mil portal site maritime ... flags xf sfh.html Flags of the World Maritime Signal Flag History DEFAULTSORT Maritime Flag Signalling ... more details
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