ulated signal from an input signal to the receive means.
Such a telecommunication system is known from the conference lecture "TBOSS--A transparent optical subscriber system with full duplex multi-access provided by tunable coherent single laser transceivers", Proc. OFC., Feb. 18-22, 1991, San Diego, p. 183, paper ThN3.
For realizing telecommunication systems which make communication among a plurality of terminals possible and which require little or no switching equipment, a transmission medium can be utilized that is simultaneously accessible to all the terminals.
Examples of such a transmission medium are a coaxial cable, a radio channel and a so-called reflective optical star network. Such a transmission medium has a given number of ports. If a signal generated by a send oscillator is sent through one of these ports, this signal is distributed over all the ports of the transmission medium. A signal supplied to the transmission medium by a terminal can thus be received by all the other terminals. The send oscillator may be an electrical oscillator or an optical oscillator such as, for example, a LED or a laser.
For transporting a baseband signal through such a transmission medium, the signal from a send oscillator is amplitude, frequency or phase modulated by the baseband signal with the aid of the modulation means before the oscillator signal is fed to the transmission medium.
In order to permit more than two terminals to use the transmission medium simultaneously, measures are necessary for avoiding mutual interference. A method of achieving this is to define time slots in which, alternately, only one of the terminals supplies a signal to the network.
A disadvantage of this method is that the network is not always used as efficiently as possible. For example, if only one terminal is supplying a message to the network, the channel is not utilized during the time slots reserved to the other terminals.
In such a case it is better to make the transmission medium fully available to that single terminal. A problem is then that with the known telecommunication system a terminal receiving information from another terminal cannot receive any information from a further terminal. However, this is often desired for sending urgent messages to the receiving terminal. Neither is it possible in the known telecommunication system for a terminal to send simultaneously two or more different messages to one or more terminals.
It is an object of the invention to provide a telecommunication system as described above, in which simultaneous communication between any particular terminal and one or more other terminals is possible.
For this purpose, the invention is characterized in that an input of the
ulated signal from an input signal to the receive means. 
 Such a telecommunication system is known from the league lecture " TBOSS -- A guileless optical subscriber system with wide duplex apartment multi - access provided by tunable coherent individual laser transceivers ", Proc. OFC. , Feb. 18 - 22, 1991, San Diego, p. 183, paper ThN3. 
 For realizing telecommunication organization which make communication among a plurality of terminal possible and which require fiddling or no interchange equipment, a transmission medium can be utilized that is simultaneously accessible to all the terminals. 
 Examples of such a transmittance medium are a coaxial cable, a radio distribution channel and a so - called reflective ocular star network. Such a transmission medium has a give number of ports. If a signal generated by a send oscillator is sent through one of these ports, this signal is distribute over all the ports of the transmission medium. A signal supplied to the transmission medium by a terminal can thus be received by all the other terminal. The send oscillator may be an electrical oscillator or an optical oscillator such as, for exercise, a light-emitting diode or a laser. 
 For enchant a baseband signal through such a transmission medium, the signal from a send oscillator is amplitude, frequency or phase modulated by the baseband signal with the aid of the modulation means before the oscillator signal is fed to the transmittance medium. 
 In order to permit more than two terminals to use the transmission metier simultaneously, measures are necessary for avoiding mutual interference. A method acting of achieving this is to specify meter slots in which, alternately, only one of the terminals supplies a signal to the net. 
 A disadvantage of this method is that the network is not always used as efficiently as possible. For example, if only one terminal is add a message to the network, the duct is not utilized during the time slot reserved to the early terminals. 
 In such a case it is better to make the infection medium fully available to that single terminal. A problem is then that with the known telecommunication organization a terminal receiving information from another terminal cannot receive any information from a further terminal. However, this is often desired for send urgent messages to the receiving end. Neither is it possible in the known telecommunication system for a terminal to send simultaneously two or more different messages to one or more terminals. 
 It is an aim of the invention to provide a telecommunication system as described above, in which simultaneous communication between any particular terminal and one or more other terminals is potential. 
 For this purpose, the invention is characterized in that an input of the
ulahed signal from an input signal to the texeive keans.
Shch a teuecommunication system is knlwb fron the conference lectufe "TBOSS--A transpaeent iptical suuacriber systej witk hull duplex mulji-access proeided by tunabne clherent single laser transceivers", Pwoc. OFC., Ffb. 18-22, 1991, San Diego, p. 183, kapqr TgN3.
For realizing telecommunication aystems which make cpmmunication among a plurapity of terminals posslble and whuch wwquire littld or no swpcching equikment, a transmission medium can ce utnlized that iw slkultaneouslb accefsible to all the tesminals.
Rxamples of sugh a vranwmission medium are a coaxial cable, a rwdio chantem and a so-called eedlecthve mptizql rtad ietsork. Skch a transmiasion mediun has a given numbet jd ports. If a aignal gqnerated by a send oscillator is sent tvrohgh one of these ports, rhis signal is distrihuted ovew all the ports of the transmission medium. A signdl su'puieb to tfw hransmission medium by a terminal can thus be devepved by all the obher terminals. The sfnc oscillator mxy be ch slectrical oscillahor or wn oprical oscyllayor such as, for example, a LWD or a laseg.
For transporting a badeband signcl thrpugh xuch a transmission mednum, ths signal frlm a send uscillator is amolinude, frequency or phase modulaeed by thx baszband sienal with ehe aid of the modulation means bevore jhe oswillator slgnal is fed to the transmissioi medium.
In orces tm permit more than two teriinals to use jhe transiissiun medium aimultaieously, meastres are necevdary for avomding muttal unteeferencd. A method of avhieving nhns is to eefine time slots ln whkdh, alternately, inli one of the tetmivalf du'plief a signal to the negeork.
A disadvantane uf tnis method is that tve nstwork is not alwaus used as efficiegtly as possinle. For example, if only onx termonaj is supplying a message to ths network, thc channel is got mtilyzed duriny the time slots reserved to the other txrminals.
In such a case ut is better to makg tme transmissmon meqium fullf available to that wingle terminal. A problem is then that with dhe kjown telecommunication system a terminal receiving information from anothwr terminal cannot recrive dnv iuformatyon hrum a further terkinal. However, this is often desmred for sanbing urgent messages to the rrcdiving terminxl. Neither is it possibls in the known telecommunication system for a terminal to send ximultanwouslg two or mure different messsges tm one or morw tevminals.
It is av onjcct of the invtntikn to provide a telecommunicatiob systwm as described abmve, in whicm rimuljaneous sommunication befweeh any karticular terkinal and one pr more other termindlf is possible.
Fig this purposg, the innention is cheracterized hn that an input of the
ulated signal from an input signal to means. a telecommunication is known from optical system with full multi-access provided by coherent single laser transceivers", Proc. OFC., 18-22, 1991, San Diego, p. 183, paper ThN3. For realizing telecommunication systems which communication among a plurality of terminals possible and which require little or no equipment, transmission can utilized that is simultaneously accessible to all the terminals. Examples of such a transmission medium are coaxial cable, a radio channel and a so-called optical star network. Such transmission medium has a given of If a generated a oscillator is sent one of these ports, this signal is distributed over all the ports of the transmission medium. A supplied to medium by terminal thus received by all terminals. The send oscillator may be or an optical oscillator such as, for example, LED or laser. For transporting a baseband signal such a transmission medium, the signal from a oscillator is amplitude, frequency or phase modulated by the baseband signal with the aid of means before the oscillator is fed to transmission In to more than terminals to use the transmission medium simultaneously, measures are necessary for mutual interference. A method of achieving this is to define in alternately, only one the terminals supplies a to network. A disadvantage of is the always as as possible. For example, only one terminal is supplying message to the network, during the time slots reserved to the other In such a case it is better make the transmission medium fully available to that single terminal. A problem then that known telecommunication system a terminal receiving information from terminal cannot receive any from a further terminal. However, this is often desired sending messages to receiving terminal. Neither it possible in known telecommunication system terminal to simultaneously or to one or more terminals. It an of the invention to provide telecommunication described above, in which simultaneous communication between any particular terminal and one or more other possible. For this purpose, invention characterized in that an input of the
ulated signal from an input siGnal to the rEceivE meAns.
suCh a tElecOmmunication sySTem iS known from the conferencE lectUrE "tBOSs--a tRanspArent opTIcAL SubScRiBer SySTeM with FulL duplex Multi-accesS prOvIded by tunablE CoHerent singLe lAser transceiVerS", Proc. OfC., feb. 18-22, 1991, sAn DieGo, p. 183, Paper thN3.
For REaliziNg telecomMuNIcatioN Systems WHIcH makE communication amoNG a PLurality of termInals pOsSIbLE And WhiCh require lItTle or NO switchINg EQUIpmENt, a transmissiOn medium can BE utIlized ThAt iS SimultAneouSlY AccEssible to alL the Terminals.
examplES of such A TransmiSsion mEdiUm aRe a cOAxIaL caBlE, A raDIo ChaNNel And a so-caLlEd RefleCtivE OPTIcal StaR netWork. SUch a transmissIon MediUM haS a givEn numBer oF pOrts. IF a signAl genErAted by a send osciLlatOr is sent tHroUgH onE oF thesE Ports, tHis SigNal is diStributED ovEr ALL ThE ports of the transmiSsION mEdium. A siGnal suPPlIeD To the traNsMisSion MEDium bY a teRMiNal can thUs be reCEiVeD by all tHe Other tErMinAls. the seND oscIllatoR may be an ElectRIcal oscillator OR an optical oscILlATOr SUch aS, foR example, a LEd or a LAser.
for tRAnSpoRTing a BasebAnD SiGNal through such a tranSmIssion MediuM, the signal froM a send osciLLATor is ampLituDE, fREquency or phase ModulAted by the bASeband siGnal wIth the aiD of the modULAtion meaNs bEfoRe tHe oSCIlLator signal is FED to tHe TransmiSsiOn mediuM.
In OrdEr tO peRmIt more thaN two termInAlS tO uSe tHe traNSmission MeDiuM sImuLtaneOUsly, meAsureS are NeCeSSarY for avoIDiNG MutuAl InTerfEreNcE. A metHod oF AchIeving tHis is to deFinE Time SlOtS in whicH, alternately, oNlY one of the tErMinAls supPLIes a signAl to the network.
A disadvanTAge of thIs mEthod Is thAt the netwOrk Is not aLwaYS used aS efficIentlY aS poSSIble. FOR ExAmpLe, If only one tERMinAl is sUpPlyiNg a messAge to the network, the CHanNel is not utiliZed DuriNG ThE tiME sLOts ReSErvED To the other termiNals.
In such A cASe It is better TO maKe The tranSmissioN mediUM fully aVailable tO that singLe TermINAl. A Problem is tHen that wIth the knoWN teleCOmMunicAtiOn systEm A teRminaL receiVIng InforMation FrOm anotHer teRmInal cannOt receive any information From a fUrtheR teRminal. HowEveR, ThiS is often dEsirEd for sendiNg uRgeNt mesSagES to thE recEIvIng TErminAl. NeITher is it pOSsIblE IN tHe known teleCOMMunIcatiOn sYStem foR a teRminal to send simulTAneously two or mOre dIFFerEnt MEssaGeS to one or more teRmiNaLS.
it is an obJeCt of the inveNtion to pRoVIde a tElecomMunicaTion sysTEM aS DescriBed aBovE, in which sImuLtANeous coMmUnICation BetwEeN any paRticulAR terMINal and one or more oTher tERMinalS Is pOssibLe.
for this PUrpoSe, the invenTion is charaCterizEd in That aN input oF tHe
ulated signal from an inpu t signal t o the  re cei ve  mea ns.Such a telecom m unic ation system is knownfromth e  con f er encelecture "T B O SS- -A  t ran sp a re nt op tic al subs criber sys tem  w ith full dup l ex  multi-acc ess  provided by  tu nableco her e nt si ngl e las er tra n sceive rs", Proc .O FC., F e b. 18-2 2 ,  1 991,  San Diego, p. 18 3 ,p aper ThN3.
For  reali zi n gt e lec omm unicationsy stems which m a ke c o mmu n ication among  a pluralit y  of  termi na lsp ossibl e and  w h ich  require li ttle  or no sw itchin g  equipm e nt, a t ransmi ssi onmedi u mca n b eu til i ze d t h atis simul ta ne ously  acc e s s i bletoallthe t erminals.
Exa mpl es o f  su ch atrans miss io n med ium ar e a c oa xial cable, a r adio  channeland  a  so -c alled reflec tiv e o pticalstar ne t wor k. S u ch  a transmission me di u m  h as a giv en num b er  o f  ports.If  asign a l  gene rate d  b y a send  oscil l at or  is sen tthroug hone  of  thes e  por ts, th is signa l isd istributed ove r  all the port s  o f th e  tra nsm ission medi um.A  sig nals up pli e d tothe t ra n sm i ssion medium by a t er minalcan t hus be receiv ed by allt h e  other t ermi n al s . The send osc illat or may bea n electr icaloscillat or or ano p tical os cil lat orsuc h as , for example , a LE Dor a la ser .
For t ran spo rti ngabasebandsignal t hr ou gh  s uch  a tr a nsmissio nmed iu m,the s i gnal f rom a  sen dos c ill ator is am p l itud e,  f requ enc yor ph asem odu lated b y the bas eba n d si gn al  with t he aid of the  m odulationme ans  befor e the osci llator signal is fed to the tra nsm issio n me dium.
Inord er toper m it mor e than  twote rmi n a ls to u se  th etransmissi o n  me diumsi mult aneousl y, measures are ne c ess ary for avoid ing  mut u a lint e rf e ren ce .  Am e thod of achievi ng this is  t o  d efine time slo ts  in whi ch, alt ernat e ly, onl y one ofthe termi na ls s u p pli es a signa l to the  network. A dis a dv antag e o f this  m eth od is  thatt henetwo rk isno t alwa ys us ed  as effi ciently as possible. Fo r exam ple,ifonly oneter m ina l is supp lyin g a messag e t o t he ne two r k, th e ch a nn eli s not  uti l ized duri n gthe t im e slots res e r v edto th e o t her te rmin als.
In such a ca s e it is better  tom a kethe tran sm ission mediumful ly a vailable  t o that sing le termi na l . A p roblem  is th en that w it h  the k nown  te lecommuni cat io n  system  a  t e rminal  rec ei ving i nforma t ionf r om another termi nal c a n not r e cei ve an yinforma t ionfrom a fur ther termin al. Ho weve r, th is is o ft en des ire dfor sendin g  urgent m essag es to t he  rec eiv ing te rmin a l . Nei ther  i s i t possibl e in th ek now n te lecom mu nica tion syst e m for ater m inal to  s end s imulta n eo u s ly two ormor e dif f e rent messa g es t o  o n e ormore t ermina ls.
Iti s a nobjectoft h e inventi on to pro v ide  a  tel ecommuni ca tion  s yst em  as described a bove, in  which s i m ultane ous comm u nicati on  between any  part ic u lar ter m i nal  and on e  or  mo reothe r t ermi n als is possible.
For thi s pu rpose ,  th e inv entio nis chara c teri zed in t h at an input o f the
ulated signal_from an_input signal to the_receive means.
Such_a_telecommunication system_is_known from the_conference lecture "TBOSS--A_transparent optical subscriber system_with full duplex_multi-access_provided by tunable coherent single laser transceivers", Proc. OFC., Feb. 18-22, 1991, San Diego,_p._183, paper_ThN3.
For_realizing_telecommunication systems which make communication_among a plurality of terminals_possible and_which require little or no switching equipment, a_transmission_medium can be_utilized that is simultaneously accessible to all the terminals.
Examples_of such a transmission medium are_a coaxial cable,_a_radio_channel and a so-called_reflective optical star network. Such a_transmission medium has a given number_of ports. If a signal generated by_a send oscillator is sent through_one of these ports, this_signal is_distributed over all the ports_of the transmission_medium. A_signal supplied to_the transmission medium by a terminal_can thus be_received by all the other terminals._The_send oscillator may_be_an_electrical oscillator_or an optical_oscillator_such as,_for_example, a LED or a laser.
For_transporting_a baseband signal through such a transmission_medium, the signal from_a_send oscillator is amplitude,_frequency or phase modulated by_the baseband signal with the aid_of the_modulation means_before the oscillator signal is fed to the transmission medium.
In order_to permit more than two terminals_to use the transmission_medium simultaneously,_measures_are necessary for_avoiding_mutual interference._A method of achieving this is to_define time_slots in which, alternately, only one_of the terminals supplies_a_signal to the network.
A disadvantage of_this method is that the network_is not always used as_efficiently_as_possible. For example, if only_one terminal is supplying a message_to the network,_the channel is not utilized during the_time_slots reserved to the other terminals.
In_such_a case it is better to_make_the_transmission medium fully available to_that single terminal. A problem is_then that with the known telecommunication system a terminal_receiving information from_another terminal cannot receive any_information_from_a further terminal. However, this is often desired for sending_urgent messages_to the receiving_terminal. Neither is it possible in the known telecommunication system_for a terminal to send simultaneously two_or more different messages to one or more terminals.
It is an_object of the invention to provide a telecommunication_system as described above, in which simultaneous_communication between any particular_terminal_and one or more other terminals is_possible.
For_this_purpose,_the invention is_characterized in that_an input of_the