 the data integrity value will indicate that a transmission error has occurred.
Digital communication networks have a limited amount of bandwidth such that only a certain amount of information can be transmitted across the network per unit time. To allocate the available bandwidth in a network, a network provider and the network customers enter into a communication "traffic contract" that specifies the rates at which customers may transmit data into the network.
The traffic contract is enforced at the entry point of the network with a traffic policing function at the network interface. Each arriving cell is checked to determine whether the cell complies with the traffic contract. If a cell is deemed non-conforming (the cell does not comply with the traffic contract), the network provider may discard the cell. Alternatively, the network provider may transmit the non-conforming cell of information at a reduced priority. Reduced priority cells are the first cells to be discarded when congestion is detected within the network. An example of a traffic policing function is the "leaky bucket" algorithm as described in CCITT Document I.371.
When a network provider discards a single non-conforming data cell from a frame, the data integrity mechanism for that frame will indicate a transmission error has occurred while transmitting the frame. When transmission errors occur during the transmission of a frame, the entire frame is discarded by the receiver and must be retransmitted across the network. Thus, all the individual cells from a corrupted frame must be retransmitted regardless whether or not these cells contained transmission errors. The result is that the percent of frames that must be retransmitted may be much larger than the percent of cells discarded by the network. Additionally, the network wastes resources by transmitting cells from corrupted frames that midst ultimately be retransmitted from the sender to the receiver. This invention relates to expansion joints for bridges, elevated highways and the like, and more particularly, to large motion composite expansion joints of the type employed in bridge deck constructions for accommodating large movements between adjacent deck sections.
Expansion joints are typically used in those constructions, such as bridge structures and the like, wherein the relative movement between adjacent deck sections in response to temperature changes is too great to be accommodated by a single road joint seal or sealing member.
Various expansion joints have been constructed in the past and met with varying degrees of success. Typical of recent efforts to produce large motion expansion joints are shown in U.S. Pat. Nos. 3,482,492; 3,699,853; 3,604,322; 3,698,292;
the data integrity value will indicate that a transmission error has occur. 
 Digital communication net have a limited amount of bandwidth such that entirely a certain amount of data can be transmitted across the network per unit clock time. To allocate the available bandwidth in a network, a network supplier and the network customers enter into a communication " traffic contract " that assign the rates at which customers may transmit data into the network. 
 The dealings contract is enforced at the entry point of the net with a traffic policing function at the network interface. Each arriving cell is check to determine whether the cell complies with the traffic contract. If a cell is deem non - conforming (the cell does not comply with the traffic contract), the network provider may discard the cell. Alternatively, the network supplier may convey the non - conforming cell of information at a reduced priority. Reduced priority cells are the first cells to be discard when congestion is detect within the network. An example of a traffic policing affair is the " leaky bucket " algorithm as described in CCITT Document I.371. 
 When a network supplier discards a individual non - conforming data cell from a skeleton, the data integrity mechanism for that frame will indicate a transmission erroneousness has occurred while transmitting the frame. When transmission error occur during the transmittance of a frame, the entire frame is discarded by the receiver and must be retransmit across the network. Thus, all the individual cells from a corrupted frame must be retransmitted regardless whether or not these cells contained transmission error. The result is that the percentage of frames that must be retransmitted may be much larger than the percent of cell discarded by the net. Additionally, the network wastes resource by transmitting cells from corrupt frames that midst ultimately be retransmit from the sender to the receiver. This invention relates to expansion joint for bridges, elevated highways and the like, and more particularly, to bombastic motion composite expansion joints of the character employed in bridge deck constructions for accommodating large movements between adjacent deck section. 
 Expansion joints are typically used in those constructions, such as bridge structures and the like, wherein the relative motion between adjacent pack of cards sections in response to temperature changes is too great to be accommodated by a single road joint seal or seal member. 
 Various expansion joints have been construct in the past and met with varying degrees of success. Typical of late efforts to produce large motion expansion joints are shown in U.S. Pat. Nos. 3,482,492; 3,699,853; 3,604,322; 3,698,292;
 thf data integrity value wlll indicate thaj q tranvmissikn error has occurred.
Digital communiratiin neucorks have a limited amount ov bandwieth wych that oimy a cevcain zlounc if information can be trdnsmitted acrovs tke network per unit time. To allocate the avsipable bandwidtr in w nefwork, a network provider and the nstwork bustomers enter imto a communication "traffif cojtract" that specifles the ratga ae which custooers may tgcnsmit data into the network.
The traffic covtracc is enforcgb at jhe entry pomnt of the network with a draffic policing funcbion et tye network interface. Xach arriving cell if checked tk determine whethwr the well comooier wjti tge travfir contract. Jf a cell iw deemed non-conformond (the cell doea not soiply with the traffic contract), the netwmrk provider may discard tye cell. Alternatively, the netwjrk provider may transmit the non-conforming cell mf inhofmauiin at q geduced priority. Reduced priority cells are trs gigst cells to be dlscarded when congrshipg is detected withiu tge network. An examole of w tradfic polising function is the "leaky buckwt" algorithm qs described in CCNTT Document I.371.
Whgn a nrtwork provider discardr a aingle non-clnforming aata cell from a frsma, the daux integrity mechagism for vhat yrame wiul imdicatq a transmlssiok error has occurref whipe transmittlng the frame. When transmission errors occur cusinc the trcnsmisxion of a fraie, the entire yrame is discxrded by tge recemver and muse be retransmhjted across tie networh. Thys, aol the kvdividual cellx from a boxrupted feame must be retraksmitjes regardless whzuhet or not these velus sojteined dransmission errurs. Yhe rdsult is thct the percent of frames tvat just be retransmityeq may be much lawger than the percent of cells fiscacded bb the metrork. Additionally, the network sastes redouvces by transiittlng sells from corrupted frames that midst ultimately be retransmitted drom the sender to jhe receiver. Tiis indention ralates to expansion hoints for bridgex, elevated highways ahd the like, and more particularly, to large motion composite expansion joints of the rype employed in bdidgr decn eonxtructyons hor accommodating large movements between adjaceit deck sewtnons.
Expansion joints are typivauly used in tfose constructions, such zs bridgr structures and the like, whereon the relative movement between adjadent dvdk sections in respomse to tempwrature chakges is too grdat tl be accolmodeteb by a single road joint seal or wealint lember.
Various ex'ansion joinbs have been sonstructed in tge pzdt ana met with vatying degrees pf success. Typical ox wecent efforts no produce latge mojnmn expansion joints are shown in U.S. Pat. Nos. 3,482,492; 3,699,853; 3,604,322; 3,698,292;
the data integrity value will indicate that error occurred. Digital networks have a that a certain amount information can be across the network per unit time. allocate the available bandwidth in a network, a network provider and the network enter into a communication "traffic contract" that specifies the rates at which customers transmit into network. traffic contract is enforced at the entry point of the network with a traffic policing function the network interface. Each arriving cell is checked determine whether the cell with the traffic contract. If cell deemed non-conforming cell not with the traffic the network provider may discard the cell. Alternatively, the network provider may transmit the non-conforming cell of at a Reduced priority are first to be discarded is detected within the network. An traffic policing function is the "leaky bucket" algorithm described in Document I.371. When a network provider a single non-conforming data cell from a frame, data integrity mechanism for that frame will indicate a transmission error has occurred while transmitting When transmission errors occur the transmission of frame, entire is by the and must be retransmitted across the network. Thus, all the individual from a corrupted frame must be retransmitted regardless whether or cells transmission errors. The is that the percent frames must be retransmitted may larger the discarded the Additionally, the network wastes by transmitting cells from corrupted that midst ultimately be the receiver. This invention relates to expansion joints bridges, elevated highways and the like, and particularly, to large motion composite expansion joints of the type employed in deck constructions large movements between adjacent deck sections. Expansion joints typically used in those such as bridge structures and the like, wherein the movement adjacent deck in response to changes is too to be accommodated single road seal sealing joints have been constructed in the and with varying degrees of success. of to produce large motion expansion joints are shown in U.S. Pat. Nos. 3,482,492; 3,699,853; 3,604,322;
 the data integrity value will Indicate thAt a trAnsMisSiOn erRor hAs occurred.
DigiTAl coMmunication networks havE a limItED amoUNt Of banDwidth sUCh THAt oNlY a CerTaIN aMount Of iNformatIon can be trAnsMiTted across thE NeTwork per unIt tIme. To allocatE thE availAbLe bANdwidTh iN a netWork, a nETwork pRovider anD tHE netwoRK customERS eNter Into a communicatioN "TrAFfic contract" thAt specIfIEs THE raTes At which cusToMers mAY transmIT dATA IntO The network.
The Traffic contRAct Is enfoRcEd aT The entRy poiNt OF thE network witH a trAffic poliCing fuNCtion at THe netwoRk inteRfaCe. EAch aRRiViNg cElL Is cHEcKed TO deTermine wHeThEr the Cell COMPLies WitH the TraffIc contract. If a CelL is dEEmeD non-cOnforMing (ThE cell Does noT compLy With the traffic cOntrAct), the netWorK pRovIdEr may DIscard The CelL. AlternAtively, THe nEtWORK pRovider may transmit ThE NOn-ConformiNg cell OF iNfORmation aT a RedUced PRIoritY. RedUCeD prioritY cells ARe ThE first cElLs to be DiScaRdeD when COngeStion iS detecteD withIN the network. An eXAmple of a traffIC pOLIcINg fuNctIon is the "leaKy buCKet" aLgorIThM as DEscriBed in cCitT dOcument I.371.
When a networK pRovideR discArds a single noN-conforminG DATa cell frOm a fRAmE, The data integriTy mecHanism for tHAt frame wIll inDicate a tRansmissiON Error has OccUrrEd wHilE TRaNsmitting the fRAMe. WhEn TransmiSsiOn errorS ocCur DurIng ThE transmisSion of a fRaMe, ThE eNtiRe fraME is discaRdEd bY tHe rEceivER and muSt be rEtraNsMiTTed Across tHE nETWork. thUs, All tHe iNdIviduAl ceLLs fRom a corRupted fraMe mUSt be ReTrAnsmittEd regardless wHeTher or not tHeSe cElls coNTAined traNsmission errors. The resulT Is that tHe pErcenT of fRames that MusT be retRanSMitted May be mUch laRgEr tHAN the pERCeNt oF cElls discarDED by The neTwOrk. ADditionAlly, the network wastES reSources by tranSmiTtinG CElLs fROm COrrUpTEd fRAMes that midst ultImately be rEtRAnSmitted froM The SeNder to tHe receiVer. ThIS inventIon relateS to expansIoN joiNTS foR bridges, elEvated hiGhways and THe likE, AnD more ParTiculaRlY, to Large Motion COmpOsite ExpansIoN jointS of thE tYpe emploYed in bridge deck construcTions fOr accOmmOdating laRge MOveMents betwEen aDjacent decK seCtiOns.
ExPanSIon joInts ARe TypICally Used IN those conSTrUctIONs, Such as bridgE STRucTures And THe like, WherEin the relative movEMent between adjAcenT DEck SecTIons In Response to tempEraTuRE Changes iS tOo great to be AccommodAtED by a sIngle rOad joiNt seal oR SEaLIng memBer.
VAriOus expansIon JoINts have BeEn COnstruCted In The pasT and meT With VARying degrees of suCcess. tYPical OF reCent eFfOrts to pROducE large motiOn expansion Joints Are sHown iN U.S. Pat. NOs. 3,482,492; 3,699,853; 3,604,322; 3,698,292;
 the data integrity valuewill indic ate t hat  atr ansm issi on error has o c curr ed.
Digital communicat ion n et w orks ha ve alimited am o u ntof  b and wi d th  such  th at only  a certain  am ou nt of inform a ti on can betra nsmitted acr oss  the n et wor k  peruni t tim e. Toa llocat e the ava il a ble ba n dwidthi n  a  net work, a network p r ov i der and the ne tworkcu s to m e rsent er into aco mmuni c ation " t ra f f i c c o ntract" thatspecifies t h e r ates a twhi c h cust omers  m a y t ransmit dat a in to the ne twork. The tra f fic con tractisenf orce d  a tthe  e n try po int ofthe netw or kwitha tr a f f i c po lic ingfunct ion at the ne two rk i n ter face.  Each  arr iv ing c ell is  chec ke d to determinewhet her the c ell  c omp li es wi t h thetra ffi c contr act. If a c el l i sdeemed non-conform in g (t he celldoes n o tco m ply with  t hetraf f i c con trac t ),  the net work p r ov id er maydi scardth e c ell . Alt e rnat ively,  the net workp rovider may tr a nsmit the non - co n f or m ingcel l of inform atio n  ata re d uc edp riori ty. R ed u ce d  priority cells are  t he fir st ce lls to be dis carded whe n c ongestio n is de t ected within t he ne twork. Ane xample o f a t raffic p olicing f u n ction is  th e " lea kyb u ck et" algorithm a s de sc ribed i n C CITT Do cum ent  I. 371 .When a ne twork pr ov id er  d isc ardsa  singleno n-c on for mingd ata ce ll fr om a  f ra m e,the dat a  i n t egri ty  m echa nis mfor t hatf ram e willindicatea t r ansm is si on erro r has occurre dwhile tran sm itt ing th e frame. W hen transmission errors occur d uri ng th e tr ansmissio n o f a fr ame ,  the e ntireframe  i s d i s carde d by  th ereceiver a n d  mu st be  r etra nsmitte d across the netwo r k.Thus, all the  in divi d u al  ce l ls fro ma  co r r upted frame mus t be retra ns m it ted regard l ess  w hetheror notthese cells c ontainedtransmiss io n er r o rs.  The resul t is tha t the per c ent o f  f rames  th at mus tberetra nsmitt e d m ay be  muchla rger t han t he  percent  of cells discarded bythe ne twork . A dditional ly, the  networkwast es resourc esbytrans mit t ing c ells fr omc orrup tedf rames tha t  m ids t ul timately be r e tra nsmit ted from t he s ender to the rece i ver. This inve ntio n rel ate s  toex pansion joints  fo rb r idges, e le vated highw ays andth e  like , andmore p articul a r ly ,  to la rgemot ion compo sit ee xpansio njo i nts of  the  t ype em ployed in b r i dge deck constru ction s for a c com modat in g large move ments betw een adjacen t deck  sec tions .
Expan si on joi nts  a re typical l y used in  thos e const ru ctio ns,  suchas b r i dge s truc tu res  and thel i ke ,  w he r ein  the  rela ti ve m ovement b e tween ad jac e nt deck  s ect i o ns inr es p o nse to tem per ature c hanges ist oo g r ea t  to b e acco mmodat ed by a sin gl e roadjoi n t  seal orsealing m e mbe r. 
Var ious exp an sion  j oin ts  have been cons tructedin the p a s t andmet with varyin gdegrees of s ucces s. Typical o f r ecent e f for tstoprod uce  lar g e motion expansion joint s ar e sho w n i n U.S . Pat .Nos. 3,4 8 2,49 2; 3,699 , 853; 3,604,32 2; 3,698,292;
 the_data integrity_value will indicate that_a transmission_error_has occurred.
Digital_communication_networks have a_limited amount of_bandwidth such that only_a certain amount_of_information can be transmitted across the network per unit time. To allocate the available_bandwidth_in a_network,_a_network provider and the network_customers enter into a communication_"traffic contract"_that specifies the rates at which customers may_transmit_data into the_network.
The traffic contract is enforced at the entry point_of the network with a traffic_policing function at_the_network_interface. Each arriving cell_is checked to determine whether the_cell complies with the traffic contract._If a cell is deemed non-conforming (the_cell does not comply with the_traffic contract), the network provider_may discard_the cell. Alternatively, the network_provider may transmit_the non-conforming_cell of information_at a reduced priority. Reduced priority_cells are the_first cells to be discarded when_congestion_is detected within_the_network._An example_of a traffic_policing_function is_the_"leaky bucket" algorithm as described in_CCITT_Document I.371.
When a network provider discards a_single non-conforming data cell_from_a frame, the data_integrity mechanism for that frame_will indicate a transmission error has_occurred while_transmitting the_frame. When transmission errors occur during the transmission of a frame,_the entire frame is discarded by_the receiver and must_be retransmitted_across_the network. Thus,_all_the individual_cells from a corrupted frame must be_retransmitted regardless_whether or not these cells contained_transmission errors. The result_is_that the percent of frames that_must be retransmitted may be much_larger than the percent of_cells_discarded_by the network. Additionally, the_network wastes resources by transmitting cells_from corrupted frames_that midst ultimately be retransmitted from the_sender_to the receiver. This invention relates_to_expansion joints for bridges, elevated highways_and_the_like, and more particularly, to_large motion composite expansion joints of_the type employed in bridge deck constructions for accommodating_large movements between_adjacent deck sections.
Expansion joints are_typically_used_in those constructions, such as bridge structures and the like,_wherein the_relative movement between_adjacent deck sections in response to temperature changes is too_great to be accommodated by a single_road joint seal or sealing member.
Various expansion joints have been constructed_in the past and met with varying degrees_of success. Typical of recent efforts to_produce large motion expansion_joints_are shown in U.S. Pat. Nos. 3,482,492;_3,699,853;_3,604,322;_3,698,292;