SS7stack Edit the stack image at Template SS7stack The Signalling Connection Control Part SCCP is a network layer ref http www.itu.int rec T REC Q.1400 en ITU T Recommendation Q.1400 . ref protocol that provides extended routing , flow control , segmentation, connection oriented connection orientation , and error correction facilities in Signaling System 7 telecommunications networks. SCCP relies on the services of Message Transfer Part MTP for basic routing and error detection. Published specification The base SCCP specification is defined by the ITU T , in recommendations http www.itu.int rec T REC Q.711 en Q.711 to http www.itu.int rec T REC Q.714 en Q.714 , with additional information to implementors provided by http www.itu.int rec T REC Q.715 en Q.715 and http www.itu.int rec T REC Q.716 en Q.716 . ref name qseries http www.itu.int rec T REC Q en ITU T Q Series Recommendations . ref There are, however, regional variations defined by local standards bodies. In the United States, ANSI publishes its modifications to http www.itu.int rec T REC Q.713 en Q.713 as ANSI T1.112. The Telecommunication Technology Committee TTC publishes as JT Q.711 to JT Q.714, and Europe ETSI publishes ... oriented protocol classes protocol classes 2 and 3 provide the means to set up signalling .... ref name q714 http www.itu.int rec T REC Q.714 en ITU T Recommendation Q.714 Signalling connection ... of SCCP users over Internet Protocol using the Generic Signalling Transport service specified in http www.itu.int rec T REC Q.2150.0 en Q.2150.0 , the signalling transport converter for Stream ... and a specialized Transport Independent Signalling Connection Control Part TI SCCP specified in http www.itu.int rec T REC Q.2220 en T REC Q.2220 . TI SCCP can also be used with the Generic Signalling ... Signaling System 7 Category Transport layer protocols de Signalling Connection Control Part fr Signaling Connection and Control Part hu Signalling Connection Control Part no Signaling Connection and Control ... more details
Refimprove date July 2007 Signalling block systems enable the safe and efficient operation of Rail transport railways , so as to avoid collisions between trains. Block systems are used to control trains between Railway station stations and yards, and not normally within them. Any block system is defined by its associated physical equipment and by the application of a relevant set of rules. Some systems involve the use of Railway signal signals , while others do not. Some systems are specifically designed for Single track rail single track railways, where a danger exists of both head on and rear end collision, as opposed to double track , where the main danger is rear end collision. A block system is referred to as the method of working in the UK, method of operation in the U.S, while in Australia they come under the heading of safeworking . The objective of this article is to describe the various methods of block signalling used around the world. Block signalling methods Strict timetable operation Trains operate according to a strict timetable, that is cannot leave a station until an appointed ... Train Working redirects here One Train Working with train staff see also Token railway signalling If a single .... Electric Train Staff ETS These came in two sizes, large and miniature. See Token railway signalling . Ordinary Train Staff and Ticket OTST or OTS&T See Token railway signalling . Ordinary Train ... OTS . See Token railway signalling . Telegraph Block Used on multiple track sections whereby the passage .... The signalling is designed such that the controlling signals will only allow one train to enter ... 2008 Absolute Block See British absolute block signalling . Comparison of block systems class ... that previous train has vacated the section British absolute block signalling Absolute Block Manual ... traffic control Single or multiple track Lineside signals Continuous train detection Cab signalling ... signalling de Streckenblock eo Kantono fervojo fr Block syst me it Sezione di blocco ja nl ... more details
The current Dutch railway signalling system operated by ProRail has been in effect since 1954 on the Dutch Railways network It was designed to be one of the simplest in Europe and is integrated to the Automatische treinbe nvloeding ATB EG ATB , the system of cab signalling widespread on the Dutch network. Dutch trains normally use the right hand track and the signals are placed at the right of the track in sections also equipped to run on the left track, the signals are placed on the left. Light Signals Below are common forms raised hooggeplaatst signal, can be used anywhere ground laaggeplaatst or dwarf dwergsein signal, used in areas where speeds do not exceed 40 km h, do not have numeric display warning voorsein signal. Their aspects are categorized according to the colour. There is never more than one colour at a time Green Aspect Image Lichtsein hoog groen.svg 30px Image Lichtsein laag groen.svg 30px Green proceed in the case of a dwarf signal, speed restricted to 40 km h Flashing Green proceed speed restricted, 40 km h Flashing green with figure proceed speed restricted, 10 the displayed digit in km h Yellow Aspect Image Lichtsein hoog geel.svg 30px image Lichtsein laag geel.svg 30px image Lichtsein hoog geel4.svg 30px Yellow reduce speed to less than 40 km h the next signal is at stop aspect Yellow with digit displayed reduce speed to 10 the displayed digit in km h Yellow with flashing digit displayed reduce speed to 10 the displayed digit in km h , and keep the brake if the next signal still shows a yellow aspect used to signal short sections Flashing yellow proceed at sight. Red Aspect Image Lichtsein hoog rood.svg 30px Image Lichtsein laag rood.svg 30px Red stop in front of the signal Flashing Red stop in front of the signal used for work trains . Speed displays cellpadding 5 align center Image Dutch railway ... 197596.pdf PDF 1059k all Dutch railway signals Official Rules Railwaysignalling Category Railway signalling ... more details
bus . Image EmbeddedSynchronousSignalling.png thumb 350px Single wire synchronous signalling ... DEFAULTSORT Comparison Of Synchronous And Asynchronous Signalling Category Computing comparisons Synchronous and asynchronous signalling ... more details
NOTOC The Railway signallingsignalling system used on rail gauge standard gauge rail transport in Sweden railway network in Sweden is based on the traditional Railway semaphore signal mechanical semaphore signals . Currently only the color light signals are used, together with the Automatic Train Control system. Main signals The main signals huvudsignaler display the following aspects width 80 align center Image Svenska signal 5 stopp.svg Red light width 80 align center Image Svenska signal k r.svg One green light width 80 align center Image Svenska signal 5 k r 40 varsamhet.svg Two green lights width 80 align center Image Svenska signal 5 k r v nta stopp.svg A green light above a flashing green light width 80 align center Image Svenska signal 5 k r v nta k r.svg A green light above a flashing white light width 80 align center Image Svenska signal 5 k r v nta k r 40.svg A green light above two flashing green lights width 80 align center Image Svenska signal 5 k r 40 kort v g.svg Three green lights align center valign top Stop align center valign top Clear 80 km h align center valign top Clear 40 km h, caution align center valign top Clear 80 km h, br expect stop align center valign top Clear 80 km h, br expect clear 80 km h align center valign top Clear 80 km h, br expect 40 km h align center valign top Clear 40 km h, br short entry route The aspects may seem a little inverted, since a single green light means clear 80 , two green lights .... ATC signalling typically allow higher speeds. Stop Stopp in Swedish language Swedish means that the signal ... railway signalling and it would be unsafe for drivers to cross the border, unless Automatic Train Protection ATP were fitted. Sources http www.thesignalpage.nl Swedish signalling section of The Signal ... Forsstr m in Swedish date 20070527231723 Railwaysignalling DEFAULTSORT Swedish Railway Signalling Category Rail transport in Sweden Category Railway signalling by country sv J rnv gssignaler i Sverige ... more details
, railway signalling rules . There are several signalling systems in use History Reichsbahn Originally, the railway company of each German state had its own signalling system. After these companies were merged into one Deutsche Reichsbahn Gesellschaft Deutsche Reichsbahn , a common signalling system ... none. Signalling the route was changed about 1930 to signalling the speed. On a double armed signal ... signalling system. Only the S Bahn systems Berlin , Hamburg were equipped with newly designed colour ... were reunified. Even today, the signalling systems of the two halves of the country differ, and although ... cosmetic change The Deutsche Bundesbahn mainly kept the H V signalling, with colour lights directly ... into a common rectangular head. The signalling system didn t change much to allow Gleiswechselbetrieb ... experiments with new signalling systems were made, but only one survived the Augsburg Donauw rth line, equipped with Sk type signals. The signals still exist, and the new common West and East signalling ... adopted a new signalling system from the OSShd, an international organization of railways, mainly Eastern ... Hl system. Reunification Several signalling systems and two sets of regulations exist within reunified ... complete lines generally change to the new common Ks signalling system. However, old style signals ... in semaphore only areas. Currently no new signalling system is being developed the current systems ... to UK Signalling see also UK railway signalling UK Signalling seems to be similar to the Ks system ... signalling. To prevent trains running over a switch too fast several workarounds are in use. One ... km h Green bar 100 km h Kombinationsignale After the reunification 1990 a new signalling system ... command to the driver, as signalling safety devices mean that being diverted to the wrong route ... 160px thumb Example 1 Entering a station see image Left Secondary line with minimum signalling Right Main Line with standard signalling br style clear right Image WrongTrack.svg 320px thumb Example ... more details
merge from British railway signals date January 2011 The railway signalling systems used across the majority of the United Kingdom rail network use lineside signals to advise the driver of the status of the section of track ahead. Most lineside signals are in colour light form, but a significant number of semaphore signals remain on secondary lines. Image Two aspect signal.jpg thumb right Network Rail two aspect colour light railway signal set at danger Signals See also Railway signal and British ... type. ref Vanns, M.A., 1997 , An Illustrated History of Signalling , Ian Allan, ISBN 0 7110 2551 7 ... , Signalling in the Age of Steam , Ian Allan, ISBN 0 7110 2350 6, p.80 ref Current British practice ... light. Not all lines use four aspect signalling three or two aspects are used where the headway ... signalling sequence green, double yellow, yellow for a four aspect area and the red signal clears ... does not apply to railways with a block signalling system as there is no traffic queuing within a block ..., crossovers, stations, bay platforms, etc. and at interfaces between areas with signalling ... in the experimental speed signalling at Mirfield to provide an additional caution. It meant ..., usually on the approach or departure from large stations, but are not restricted to signalling ... this was implemented, it did away with the need for fog signalling, since the driver could tell ... http www.signalbox.org Information on traditional British signalling http www.xs4all.nl dodger tech.htm Docklands Light Railway signalling system http www.derby signalling.org.uk History of Railway Signalling in the Derby area http www.railsigns.co.uk Railway Signs and Signals of Great Britain http www.davros.org rail signalling articles junctions.html Clive Feather s Junction Signalling http www.simsig.co.uk SimSig UK Network Rail Signalling simulations Railwaysignalling Category Rail infrastructure in the United Kingdom Category Railway signalling by country United Kingdom ... more details
systems from 1950. Absolute block signalling however still constrains capacity on many lines, major ... although the definition of up has little bearing on the actual signalling of trains . The absolute block system does not replace the use of any other form of signalling, such as fixed signals, hand ... for trains in both directions in the section between B and C. Signalling bell block bell File Block Instruments 2.JPG thumb left Tyer s single stroke signalling bell File Block Instruments 8.JPG thumb Internal view showing the coil, clapper and relay The signalling bell , also known as a block bell ... withdrawn 5 2 Release Token railway signalling token Electric Token Block only 2 5 Token replaced Electric ... box before each signal is sent. Signalling a train Image AbsoluteBlockDiagram.gif center frame alt Diagram showing the layout of an example signalling layout. The location of signals at signalboxes A, B .... Our example train will travel in the Up direction. Let us consider the process of signalling a train ... working of trains between manual signal boxes. As power signalling installations are implemented ... above all Network Rail RUSs point to lines where absolute block signalling is a bar to increased ... block system on www.signalbox.org reflist Railwaysignalling Category Railway signalling in the United ... more details
Belgian railway signalling is the signalling in effect on the Belgian rail network operated by Infrabel . Preamble Image CX D.45.jpg thumb counter flow track signal with a chevron and a speed restriction display 5 50 km h . After this signal, the train will drive under normal track regime and cross back to the left track at 50km h There are in Belgium two types of train movement major movement e.g. mainline operation that occurs during normal operation traffic moves at the speed permitted by the signalling and regulations minor movement e.g. shunting which is done by driving by sight and never faster than 40 km h. The change from one movement to the other is done by signals main stop signals or a written order. The first movement which is always executed as minor movement happens in the following situations a driver taking over a new train a change in driver s cab or direction of travel receipt, change or removal of train number vehicles that can drive on themselves are coupled or decoupled when permission is needed to continue to drive after an incident when beginning to shunt Within major movement, there are two regimes, linked to bi directional operation on double track lines normal track regime the signals are located on the left of the track. However, in some cases, the configuration ... flame red lights flashing requiring halt clr Cab signalling Image Rep re sncb.jpg thumb A main stop .... This is the new standard for Belgian signalling, supposed to be deployed on most lines equipped with conventional signalling. The signals are the same as classic ones, but they are combined with automatic train control and cab signalling. The trigger for developing this system was the P crot rail ... of the driver. Other cab signalling systems Transmission Voie Machine TVM 430 on the LGV ... video Forest to Lille with signals explained Railwaysignalling DEFAULTSORT Belgian Railway Signalling Category Railway signalling by country Belgium fr Signalisation ferroviaire en Belgique ... more details
other. This system allows the whole line to operate without any further signalling personnel ... NSTR Signalling www.railsigns.co.uk retrieved 2009 03 04 ref , the Matlock branch in Derbyshire ... at Coombe Junction, where the two sections meet. There is no other signalling on the branch except ... still used for temporary situations such as through engineering works or where the signalling system ... Staff ETS See also commons category Tokens railway signalling Annett s key Radio Electronic Token Block Signalling block systems Single line working Tyers Electric Train Tablet References reflist Vanns, Michael A 1997 An Illustrated History of Signalling . Ian Allan Publishing, Shepperton, England. Railwaysignalling Category Railway signalling cs ezlo eleznice ja pl Ffestiniog Railway ... more details
Swiss railway signalling describes the railway signalling systems used in Switzerland by the different railway companies. There are two main types of signal, used up to 160 km h, above which speed cab signalling is used. The rules of the railway still cover mechanical signals, which have all but disappeared. Legal aspects Signalling is governed by strict rules, controlled by the Federal Transport Office working with the train companies. The rules for railway operation are laid out in les Prescriptions de circulation des trains , of which the latest version was issued in July 2010 ref name presc and are based on article 11 of the decree of 23 November 1983 on railways. ref name ordon Light signals File 20080427Y059 NINA014.jpg thumb Example of an L type light signal Swiss light signals are divided into two classes, recognizable by the difference in shape of the signal type L for Light and type N for num rique digital . Type L was developed many years ago. The N system was developed for the Rail 2000 project and shows a clear influence of the Dutch NS 54 system. In contrast to the latter the type N uses the 3 coloured lights in a triangular position, whereas the Dutch system positions them in a vertical line. There are more differences, mainly signalling an occupied section of track to the driver. In both systems, a distant signal tells the driver the aspect of the following home signal according to the Block system . The driver must act accordingly to prepare for the situation at the home signal. Distant signals are always square while home signals are round N or elongated ... signalling and thus play the role of a distant signal. Thus, if a driver passes an N type signal ... signal, which may continue to impose a speed restriction. Speed signalling is no longer based on combinations ..., 23 novembre 1983 ref references Railwaysignalling DEFAULTSORT Swiss Railway Signalling Category Railway signalling by country Switzerland cs N v stidla v carsk ch drah de Eisenbahnsignale in der ... more details
Pfam box Symbol RGS Name Regulator of G protein signalling domain image PDB 1gia EBI.jpg width caption Structures of active conformations of Gi alpha 1. ref name pmid8073283 cite journal author Coleman DE, Berghuis AM, Lee E, Linder ME, Gilman AG, Sprang SR title Structures of active conformations of Gi alpha 1 and the mechanism of GTP hydrolysis journal Science volume 265 issue 5177 pages 1405 12 year 1994 month September pmid 8073283 doi 10.1126 science.8073283 url ref Pfam PF00615 InterPro IPR000342 SMART RGS PROSITE PDOC50132 SCOP 1gia TCDB OPM family OPM protein 2bcj PDB PDB3 2af0 A 83 198 PDB3 2crp A 64 179 PDB3 1agr H 62 175 PDB3 1ezy A 62 177 PDB3 1ezt A 62 177 PDB3 2bt2 A 65 180 PDB3 2bv1 A 72 186 PDB3 1cmz A 90 205 PDB3 1zv4 X 84 199 PDB3 1fqj B 299 413 PDB3 1fqk D 299 413 PDB3 1fqi A 299 413 PDB3 2a72 A 333 447 PDB3 2es0 A 336 441 PDB3 1emu A 88 210 PDB3 1dk8 A 88 210 PDB3 1ym7 D 54 174 PDB3 1omw A 54 174 PDB3 2bcj A 54 174 Regulators of G protein signalling or RGS are protein structural domain s that activate GTPase s for heterotrimeric G protein alpha subunits. RGS are multi functional, GTPase accelerating proteins that promote GTP hydrolysis by the alpha subunit of heterotrimeric G proteins, thereby inactivating the G protein and rapidly switching off G protein coupled receptor signalling pathways ref name PUB00006536 cite journal author De Vries L, Farquhar MG, Zheng B, Fischer T, Elenko E title The regulator of G protein signaling family journal Annu. Rev. Pharmacol. Toxicol. volume 40 issue pages 235 271 year 2000 pmid 10836135 doi 10.1146 annurev.pharmtox.40.1.235 ref . Upon activation by GPCRs, heterotrimeric G proteins exchange GDP for GTP, are released from the receptor, and dissociate into free, active GTP bound alpha subunit and beta gamma dimer, both of which activate downstream effectors. The response is terminated upon GTP hydrolysis by the alpha subunit InterPro IPR001019 , which can then bind the beta gamma dimer InterPro IPR001632 InterPro ... more details
quadronormativo Ministeriale RS 13 12 08.pdf RFI signalling regulations last updated 13 12 08 Section ... etuttle rail ital.htm JB Calvert s page on Italian railway signalling and its history References ... more details
Polish railway signalling system provides complex outlook of traffic situation, yet is quite easy to understand. Signals can be divided into following categories near and distant displays semaphores Semi automatic semaphores semi automatic , Automatic semaphores automatic distant only displays Warning shields warning shields auxiliary Semaphore repeaters semaphore repeaters shunting Maneuver shields maneuver shields Most signals are Electric signals electric . Mechanical signals Mechanical signals are in decline. Electric signals Semi automatic semaphores Semi automatic is the most important type of semaphore on Polish railways. It s name reflects the fact that it switches to red stop signal automatically after a train passed it, while it must be switched to clear by explicit signal from signal box or dispatch centre. It is a typical semaphore in use on stations. A semi automatic semaphore can be recognized by its post painted red and white strips. Dwarf versions have their boxes painted so. Red stop signal on semi automatic semaphore must not be passed. As presented on this compact chart, semi automatic semaphore can display both near and distant signals. Near signals either command stop or impose a certain speed limit beginning with this semaphore. Distant signals tell driver what to expect at the next semaphore, especially when braking is required. border 1 cellspacing 0 cellpadding 5 width 350px align center class wikitable colspan 5 align center Distant signal align center valign center Vmax align center valign center 100 km h align center valign center 60 or 40 km h align center valign center Stop align center valign center unspecified align center valign top File Zielony g ra ci g y.svg br File Wygaszony rodek.svg align center valign top File Zielony g ra migaj cy.svg br File Wygaszony rodek.svg align center valign top File wygaszony g ra.svg br File ... signalling by country ... more details
is illuminated for 2 seconds, signalling the first driver in that lane to begin acceleration. Then the signal ... List Of Variations In Traffic Light Signalling And Operation Category Pedestrian crossing components ... more details
London Bridge Area Signalling Centre ASC is a Signalling control signalling centre on the Kent Route of Network Rail Ltd. on the railway in Great Britain , principally covering the line from London Charing Cross railway station Charing Cross , Cannon Street railway station Cannon Street and London Bridge railway station London Bridge to Kent and Sussex route areas of Network Rail Ltd. The signalling centre opened in 1974. The development of London Bridge ASC During 1974 75, the first section of the control panel in London Bridge ASC was commissioned, gradually replacing redundant signalling locations in the area and principally replacing the old 1923 built London Bridge signal box. Railway track layouts were altered to separate Cannon Street, Charing Cross and London Bridge Central traffic. Prior to the London Bridge ASC, Cannon Street and Charing Cross traffic arrived at London Bridge on all lines and was either signalled approaching or leaving London Bridge station to their respective destinations. With the development of London Bridge ASC, all this traffic was sorted out further outside London Bridge, mainly at Parks Bridge but occasionally in the New Cross area. The London Bridge ... ASC is widely accepted within the railway industry to be the busiest signalling location in Europe . Citation ... station which are the busiest railway platforms in Europe. Citation needed date January 2010 The signalling centre The signalling centre is a two storey building. The upper section is about two thirds ... to the lower storey s brown walls. The signalling centre houses some of the Railway signal signalling ... oval dais that has two banks of work panels desks that face the overview diagram. This is where the signalling ... panels are divided into nine manageable panels. The signalling centre is open twenty four hours a day every day of the year. It takes a total of 56 Signalman rail signallers and 4 shift signalling ... Categories Category Railway signalling Category Rail infrastructure in the United Kingdom Category ... more details
orphan date December 2009 The Anti apoptotic Ras signalling cascade is an intracellular signal transduction cascade that involves the Ras protein Ras protein and inhibits apoptosis . It is the target of the cancer drug gefitinib . It may refer to the PI3K AKT pathway ref http www.ncbi.nlm.nih.gov pubmed 15284455 Gefitinib sensitizing EGFR mutations in lung cancer activate anti apoptotic pathways. 2004 ref ref http genesdev.cshlp.org content 11 6 701.abstract The PI 3 kinase Akt signaling pathway delivers an anti apoptotic signal 1997 ref ref http www.springerlink.com content 86l52127046nx383 2Hypoinsulinemia Alleviates the Grf1 Ras Akt Anti Apoptotic Pathway and Induces Alterations of Mitochondrial Ras Trafficking in Neuronal Cells 2009 ref . It may refer to the MAPK ERK pathway which involves ras and can affect apoptosis. ref http cancerres.aacrjournals.org cgi content abstract 67 21 10343 Suppression of PTEN Expression Is Essential for Antiapoptosis and Cellular Transformation by Oncogenic Ras 2007 ref ref http www.aacrmeetingabstracts.org cgi content abstract 2005 1 972 b Pathways potentiated by oncogenic Ras to modulate apoptosis induced by anticancer agent FR901228 2005 ref The anti apoptotic STAT protein STAT pathway does not involve Ras. See also Empty section date June 2010 References reflist External links http www.biocarta.com pathfiles h raspathway.asp Diagram of ras onwards. DEFAULTSORT Anti Apoptotic Ras Signalling Cascade Category Signal transduction Category Cell cycle Category Apoptosis biology stub ... more details
Infobox military structure name Boyd s Automatic Tide Signalling Apparatus location Irvine, North Ayrshire Irvine , North Ayrshire , Scotland br UK gbmapping coordinates image File Boydtidemarker4.JPG 200px caption The Boyd Automatic Tide Signalling Apparatus map type Scotland latitude 55.605778 longitude 4.694139 map size 150 type built 1906 builder Martin Boyd controlledby Port of Irvine materials Harled brick height 50 foot tower, mast above used Until 1970s condition Mast removed ownership North Ayrshire Council open to public No The automatic tide signalling apparatus at Irvine, North Ayrshire Irvine harbour in North Ayrshire , Scotland , is a Grade B Listed Building ref http www.britishlistedbuildings.co.uk sc 35449 harbour pilot house British Listed Buildings Retrieved 2011 03 13 ref and is probably unique, having been invented and patented by Martin Boyd, the Irvine harbourmaster, in 1905 and opened in 1906. ref name McEwan McEwan, Mae 1985 . The Harbour Fullarton folk reminisce . Pub. Fullarton Historical Society. Inside front cover. ref ref name Strawhorn Strawhorn, Page 171. ref Introduction The Port of Irvine is situated on the Clyde Coast, sited next to the River Irvine and dates, in its present location, from circa 1677, although a military report describes a port in 1566 and by inference one was present in 1514 when the Aldermen and Bailies of Irvine were ordered by the Crown to make ships and crews available for a military expedition against Lord of the Isles Donald ... for this ATMS, states that it is to be an apparatus for automatically signalling the depth ... Station The tide marker station, called the Automatic Tide Signalling Apparatus was actuated by the rise ... the flotation chamber for Boyd s Automatic tide signalling apparatus. The system entailed the provision ... Boyd s patent AUTOMATIC TIDE SIGNALLING APPARATUS, which will be opened on Wednesday 23rd curt., and will from ..., and this trade ceased in the early 1990s. The abandonment of the automatic tide signalling ... more details
The Digital Private Network Signalling System DPNSS is a network protocol used on digital trunk lines for connecting two PABX . It supports a defined set of inter networking facilities. DPNSS was originally defined by British Telecom . The specification for the protocol is defined in BTNR188. The specification currently comes under the Network Interoperability Consultative Committee. History DPNSS was developed in the early 1980s by BT, or its forerunner, Post Office Telecommunications in recognition that the emerging Digital Private Circuit Primary Rate product Megastream had to address the market for both data and voice, the latter being significantly greater because of the market for PBXs. It may seem odd now Says who date April 2011 that BT would invest in the development of a signaling protocol for PBXs in which it had a minority interest and in competition with its PSTN services. Under the liberalization rules of the day 1979 , BT was barred from manufacturing, selling or supplying PBXs of more than 200 extensions. Digital PCM based PBXs were just starting to come into the marketplace with the ROLM Northern Telecom SL1, and Plessey PDX, it was recognised that corporate customers would wish to network these systems across the country. At the time, CAS inter node signaling was slow and inter register signaling MF5, developed for the PSTN, was complex and would not support sufficient features. The support for DPNSS as BT s own signaling protocol also differentiated BT s private circuit s services from those of its emerging rival Mercury Communications. In practice, DPNSS ... APNSS was developed using analogue trunks Sometimes compressed and a modem to support D channel signalling ... network carries packetised voice N x 64 Kbs speech and a separate IP signalling channel to carry the notional 64 Kbs of DPNSS signalling. A more sophisticated solution uses intelligence on the edge ... Telephony signals ro Digital Private Network Signalling System ... more details
other uses of MIDAS Motorway Incident Detection and Automatic Signalling , usually abbreviated to MIDAS , is a distributed network of traffic sensor s, mainly inductive loops, which are designed to set variable message sign s and advisory speed limits with little human intervention. On the M25 and M42 motorway s, the MIDAS helps set mandatory variable speed limit signs as part of the controlled motorway scheme . It is installed on several sections of the United Kingdom s busiest motorways, such as the congested western stretch of the M25 motorway and much of the M60 motorway around Manchester , the Birmingham box M6, M5 and M42 and the system has successfully reduced accidents. ref name hacost cite web url http www.ha research.co.uk projects index.php?id 437 title Cost effectiveness of MIDAS publisher Highways Agency accessdate 2007 01 07 ref Additionally, the system is installed on parts of the non motorway trunk road network including the A14 road A14 . ref name A14 cite web url http www.highways.gov.uk roads projects 22585.aspx title A14 Corridor Traffic Management Scheme publisher Highways Agency accessdate 2011 07 18 ref The system replaced the Automatic Incident Detection AID system which was trialled in 1989 on an convert 83 km 0 section of the M1 motorway . ref name hacost MIDAS was first installed on the M25 in 1997, after this section already had the variable speed limit . By March 2006, the Highways Agency aims to have MIDAS installed on more than convert 910 km 0 of the English motorway network. specify date December 2011 See also Electronic Monitoring and Advisory System a similar type of system in Singapore Freeway Traffic Management System External links http www.highways.gov.uk knowledge documents b040206 v1.2.pdf Highways Agency Variable Message Signs VMS PDF References reflist Category Car safety Category Road infrastructure Category Road transport in England ... more details
Unreferenced date December 2009 Single ended signaling is the simplest and most commonly used method of transmitting electrical signal s over wire s. One wire carries a varying voltage that represents the signal, while the other wire is connected to a reference voltage, usually ground electricity ground . The main alternative to single ended signaling is called differential signaling . There is also the historic alternative of Single wire earth return ground return , rarely used today. Single ended signaling is less expensive to implement than differential, but it lacks the ability to reject noise caused by differences in ground voltage level between transmitting and receiving circuits induction picked up on the signal wire The main advantage of single ended over differential signaling is that fewer wires are needed to transmit multiple signals. If there are n signals, then there are n 1 wires one for each signal and one for ground. Differential signaling uses at least 2 n wires. A disadvantage of single ended signaling is that the return current electricity current s for all the signals share the same conductor even if separate ground wires are used, the grounds are inevitably connected together at each end , and this can sometimes cause interference crosstalk between the signals. Standards Single ended signaling is widely used, and can be seen in numerous common transmission standards, including RS 232 serial communications IBM Personal System 2 PS 2 mouse and keyboard connectors I C serial bus Transistor transistor logic TTL circuits CMOS logic circuits Emitter coupled logic ECL circuits Most parallel computer buses, such as VMEbus Peripheral Component Interconnect PCI Video Graphics Array VGA video connectors SCSI interfaces for hard drives and other peripherals Some kinds of connectors, though more often used for balanced pairs, are sometimes used for single ended operation RCA jack s for audio signals TRS connector s for audio signals DEFAULTSORT Single Ended ... more details
SOCS suppressor of cytokine signaling proteins refers to a family of genes involved in inhibiting the JAK STAT signaling pathway . Genes SOCS1 SOCS2 SOCS3 SOCS4 SOCS5 SOCS6 SOCS7 External links MeshName Suppressor of Cytokine Signaling Proteins JAK STAT signaling pathway Category Cell signaling biochemistry stub The protein encoded by this gene contains a SH2 domain and a SOCS BOX domain. The protein thus belongs to the suppressor of cytokine signaling SOCS , also known as STAT induced STAT inhibitor SSI , protein family. SOCS family members are known to be cytokine inducible negative regulators of cytokine signaling. Two alternatively spliced transcript variants encoding the same protein have been found for this gene. provided by RefSeq, Jul 2008 ... more details
multiple issues context November 2011 unreferenced November 2011 medref November 2011 Local hormone s , by one definition, are biologically active polypeptide s that are secreted by nerve cells and gland cells and act in a paracrine fashion but also enter the Circulation physiology circulation . By another definition, local hormones are any hormones acting in a paracrine , autocrine signalling autocrine , and or intracrine manner. Classification According to structural and functional similarity, many local hormones fall into either the gastrin or the secretin family. Gastrin family Gastrin Cholecystokinin CCK Secretin family Secretin Glucagon Glicentin GLI Vaso active intestinal polypeptide VIP Gastric inhibitory polypeptide GIP Others Motilin Neurotensin Substance P Somatostatin was Somatostain Bombesin Serotonin Cell signaling med stub Cell biology stub Category Signal transduction Category Hormones Category Endocrine system Category Cell signaling ... more details
Image Epoxyeicosatrienoic acid.png thumb right 350px Chemical structure of 14,15 epoxyeicosatrienoic acid. The Epoxyeicosatrienoic acids or EETs are signaling molecules formed by the action of Cytochrome P450 oxidase Cytochrome P450 epoxygenase on 20 carbon essential fatty acid s, such as arachidonic acid , from which it is produced by the enzyme epoxygenase . ref name boron108 cite book author Walter F., PhD. Boron title Medical Physiology A Cellular And Molecular Approaoch publisher Elsevier Saunders year 2003 page 108 isbn 1 4160 2328 3 ref These nonclassic eicosanoid s act as short range hormone s, i.e. they are Autocrine signalling autocrine and Paracrine signalling paracrine mediators of the cardiovascular system and kidney . They produce Vasodilator vasorelaxation as well as anti inflammatory and Fibrinolysis pro fibrinolytic effects. ref cite journal author Spector AA, Fang X, Snyder GD, Weintraub NL journal Prog Lipid Res year 2004 month January volume 43 issue 1 pages 55 90 title Epoxyeicosatrienoic acids EETs metabolism and biochemical function pmid 14636671 doi 10.1016 S0163 7827 03 00049 3 ref EETs are metabolized by the soluble epoxide hydrolase to the corresponding vicinal diol , or dihydroxyeicosatrienoic acids DHETs , which are biologically less active. Biological effects Generally, EETs cause Calcium release from intracellular stores ref name boron108 Increased sodium hydrogen antiporter activity ref name boron108 Increased cell proliferation ref name boron108 Decreased cyclooxygenase activity ref name boron108 Other effects are specific to certain cells or locations EETs are cardioprotective after Myocardial infarction ischemic heart attack and reperfusion. ref cite journal author Nithipatikom K, Moore JM, Isbell MA, Falck JR, Gross GJ title Epoxyeicosatrienoic acids in cardioprotection ischemic versus reperfusion injury journal Am. J. Physiol. Heart Circ. Physiol. volume 291 issue 2 pages H537 42 year 2006 month August pmid 16473964 doi 10.1152 a ... more details
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