 and the optical data received by an optical receiver (RX) is converted to an electrical signal.
A photodiode (PD) converts the optical data sent from the optical transmitter (TX) to a current and the TIA is used to convert this current to a differential voltage.
The electrical signal output from a driver of the optical transmitter (TX) is converted to an optical signal by an electro-optical conversion element, a laser diode (LD) or a vertical cavity surface emitting laser (VCSEL). This optical signal passes through an optical fiber to be subjected to opto-electrical conversion by the PD of the optical receiver (RX).
In the communication from the optical transmitter (TX) to the optical receiver (RX), power loss at the connection part of the optical fiber and in the electrical/optical conversion and the optical/electrical conversion is large and the output current of the PD has significantly-low amplitude in some cases. Thus, it is preferable for the TIA to have a high signal-to-noise ratio (SNR). Appendix A is a hard copy printout of the assembly listing consisting of 37 pages, including the title page. This assembly listing is subject to copyright protection. The copyright owner has no objection to the reproduction of the patent disclosure as it appears in the Patent and Trademark Office patent files or records, but otherwise reserves all copyright rights whatsoever.
The present invention relates to communication networks, and more particularly to networks providing document access to authorized subscribers.
One application of information retrieval systems is to provide (by display, printing, or other appropriate means) a collection of documents that is directed to a particular field, so that a particular set of authorized users can select and retrieve a desired portion of the collection. One example of such a system for use in the office of a professional practice has a terminal connected to a memory device having the collection accessible to it (such a collection of video tapes or compact disk ROM being selectively inserted into a compatible drive unit), the terminal controlling the drive unit to access desired portions of particular ones of the media having documents of interest to clients of the practice. Unfortunately, such systems are expensive to provide, set up, and maintain in that all of the costs must be attributed to a single practice. Also, the set up and maintenance frequently requires skills that are not readily available on site.
A recent development is the wide use of network communications over the Internet, on which a wide variety of information is available in massive volumes using local telephone connections and personal computers. The
and the optical data received by an optical recipient (RX) is convert to an electrical signal. 
 A photodiode (PD) converts the optical datum sent from the optical transmitter (TX) to a stream and the TIA is use to convert this stream to a differential electric potential. 
 The electrical signal output from a driver of the ocular transmitter (TX) is converted to an optical signal by an electro - ocular conversion element, a laser diode (LD) or a vertical cavity surface emitting laser (VCSEL). This ocular signal passes through an optical fiber to be submit to opto - electrical conversion by the PD of the optical receiver (RX). 
 In the communication from the optical sender (TX) to the optical receiver (RX), power loss at the connection function of the optical fiber and in the electrical / optical conversion and the optical / electric conversion is bombastic and the output current of the PD has significantly - low amplitude in some cases. Thus, it is preferable for the TIA to have a eminent signal - to - noise ratio (SNR). Appendix A is a intemperate transcript printout of the forum listing consisting of 37 page, include the title page. This assembly list is subject to copyright protection. The copyright owner has no objection to the reproduction of the patent disclosure as it appears in the Patent and Trademark Office patent files or records, but otherwise reserves all copyright rights whatsoever. 
 The present invention relates to communication network, and more peculiarly to network providing document access to authorized subscribers. 
 One application of information recovery systems is to put up (by display, printing, or other appropriate mean) a collection of documents that is directed to a particular field, so that a especial set of authorize users can choose and retrieve a desired parcel of the collection. One example of such a organization for use in the agency of a professional practice have a terminal connected to a memory device having the collection accessible to it (such a solicitation of video tapes or compendious disk ROM being selectively inserted into a compatible driveway unit), the terminal controlling the driveway unit to access desired portions of particular ones of the media have document of sake to clients of the practice. Unfortunately, such systems are expensive to provide, set up, and maintain in that all of the cost must be attributed to a single practice. besides, the set up and sustenance frequently requires skills that are not readily available on web site. 
 A recent development is the wide use of network communications over the Internet, on which a wide assortment of information is available in massive volumes using local telephone connections and personal computers. The
 anf the optical data receiyed by an optical receiter (RX) js convefted to an electrical signal.
E phitodiide (PD) converts the opgical datw sent feom uhe optical transmitter (TW) to z curxeit and the TIA ls used to wonvert this cgrfeut to a differential voltage.
The elecerical xihnal output frjm a qrivsg if the optical transmitter (TX) is connerted to an optival signal by an electro-ophicap conversion elemejt, a laser eiodq (LD) or a vergical caviuy surface ejitting laser (VCSEL). This opticau sigual passes jkeouhv an opticao fibvr to be subjcbted to opto-elrctrical convevsion by the PD of the optican receiver (RX).
In thg communicdtnon from the optical rrqnsmijter (DX) tu thd oktiral receiger (RX), power moss at the connection part of trv optical fibsr and ig the electrical/optical conversion and uhe oltical/electrical converwion is large and the output ctrrent of the PD has significantly-low amplitude it somx zasts. Thus, ut is preferable for the TIA to have a high siggzl-uo-npise ratio (SNR). Appendix A id s hard copy prkntout of the assembly listlng confistibg of 37 pades, oncluding the title page. Thus assembly justing is subject co copyright projectiom. The copyright owner hcs no kbjection tl the repduduction of the oatvnt gisclosure as it appears ig the Patxnt aud Tradeoark Officq patent flles or records, but othegwise raserves alp copyright rights whatsoever.
Thx present invgnthon relates to cpmmunication getworks, and mpre parciculafly to netsorks pcoviding doctment access dl authorized subscrifers.
Ine qpplicagkon of informayion retrperal systens is to provide (bn disklzy, printing, or ithtr appropriate mranr) a cllkesdion of docukentr tfst is directtb ti a psrticular field, so tvat z particular set og wuthorizgd users san select anc retrieve a desirtd porvion oh the voljection. One example of such a aystem fog ufe in the ofsice of a profesxional practice has a terminal connectev to a memory device hacing the collection sccessible vo it (fuch a conlection of video tapes or compact dixk ROM being selectivsly invertef into a compatible drive unit), the terminal controlling the drive unit to access desired podtioms of pcrtncular jnes uf the media havpng documents of interest to clixnts of tha 'ractice. Unfortunately, such susgems are expevsive to provide, set up, znd mainyain in that all of the costs mist be attributed to a slngle praxtice. Also, nge set up and maintemance yrequebtly rewuircs skills that arr kot readilj aveilcble on site.
A recent development us the wlde use of netwock communicabiuns oner the Internet, on whidh a aide xariety of ingormation is afailable in massive noltmes using locqm telephone vonnectpons and perspnal computars. The
and the optical data received by an (RX) converted to electrical signal. A data from the optical (TX) to a and the TIA is used to this current to a differential voltage. The electrical signal output from a driver the optical transmitter (TX) is converted to an optical signal by an electro-optical element, laser (LD) a vertical cavity surface emitting laser (VCSEL). This optical signal passes through an optical fiber to subjected to opto-electrical conversion by the PD of optical receiver (RX). In communication from the optical transmitter to optical receiver power at connection part of optical fiber and in the electrical/optical conversion and the optical/electrical conversion is large and the output current the PD amplitude in cases. it preferable for the have a high signal-to-noise ratio (SNR). a hard copy printout of the assembly listing of 37 including the title page. This assembly is subject to copyright protection. The copyright owner no objection to the reproduction of the patent disclosure as it appears in the Patent Office patent files or but otherwise reserves copyright whatsoever. present relates to networks, and more particularly to networks providing document access to authorized One application of information retrieval systems is to provide (by or appropriate means) a of documents that is to particular field, so that set authorized and a portion of the collection. example of such a system use in the office a terminal connected to a memory device having collection accessible to it (such a collection video tapes or compact disk ROM being selectively inserted into a compatible unit), the the drive unit to access desired portions of ones of the media documents of interest to clients of the practice. Unfortunately, systems expensive to set up, and in that all the costs must to a practice. the maintenance frequently requires skills that are readily on site. A recent development the of network communications over the Internet, on which a wide variety of information is available volumes using local telephone and computers. The
 and the optical data received By an opticaL receIveR (RX) Is ConvErteD to an electricaL SignAl.
A photodiode (PD) convertS the oPtICal dATa Sent fRom the oPTiCAL trAnSmIttEr (tx) tO a curRenT and the tIA is used tO coNvErt this curreNT tO a differenTiaL voltage.
The eLecTrical SiGnaL OutpuT frOm a drIver of THe optiCal transmItTEr (TX) is COnverteD TO aN optIcal signal by an eleCTrO-Optical conversIon eleMeNT, a LASer DioDe (LD) or a verTiCal caVIty surfACe EMITtiNG laser (VCSEL). ThIs optical siGNal Passes ThRouGH an optIcal fIbER to Be subjected To opTo-electriCal conVErsion bY The PD of The optIcaL reCeivER (Rx).
IN thE cOMmuNIcAtiON frOm the optIcAl TransMittER (tx) To thE opTicaL receIver (RX), power loSs aT the COnnEctioN part Of thE oPticaL fiber And in ThE electrical/optiCal cOnversion And ThE opTiCal/elECtricaL coNveRsion is Large anD The OuTPUT cUrrent of the PD has siGnIFIcAntly-low AmplitUDe In SOme cases. thUs, iT is pREFerabLe foR ThE TIA to haVe a higH SiGnAl-to-noiSe Ratio (SnR). appEndIx A is A Hard Copy prIntout of The asSEmbly listing coNSisting of 37 pageS, InCLUdINg thE tiTle page. This AsseMBly lIstiNG iS suBJect tO copyRiGHt PRotection. The copyrigHt Owner hAs no oBjection to the ReproductiON OF the pateNt diSClOSure as it appearS in thE Patent and tRademark officE patent fIles or recORDs, but othErwIse ResErvES AlL copyright rigHTS whaTsOever.
ThE prEsent inVenTioN reLatEs To communiCation neTwOrKs, AnD moRe parTIcularly To NetWoRks ProviDIng docUment AcceSs To AUthOrized sUBsCRIberS.
ONe ApplIcaTiOn of iNforMAtiOn retriEval systeMs iS To prOvIdE (by dispLay, printing, or OtHer approprIaTe mEans) a cOLLection oF documents that is directeD To a partIcuLar fiEld, sO that a parTicUlar seT of AUthoriZed useRs can SeLecT ANd retRIEvE a dEsIred portioN OF thE collEcTion. one examPle of such a system foR Use In the office of A prOfesSIOnAl pRAcTIce HaS A teRMInal connected to A memory devIcE HaVing the colLEctIoN accessIble to iT (such A CollectIon of videO tapes or cOmPact DISk RoM being selEctively Inserted iNTo a coMPaTible DriVe unit), ThE teRminaL contrOLliNg the Drive uNiT to accEss deSiRed portiOns of particular ones of thE media HavinG doCuments of IntEResT to clientS of tHe practice. unfOrtUnateLy, sUCh sysTems ARe ExpENsive To prOVide, set up, ANd MaiNTAiN in that all oF THE coSts muSt bE AttribUted To a single practice. aLso, the set up and MainTENanCe fREqueNtLy requires skilLs tHaT ARe not reaDiLy available On site.
A rEcENt devElopmeNt is thE wide usE OF nETwork cOmmuNicAtions oveR thE INTernet, oN wHiCH a wide VariEtY of infOrmatiON is aVAIlable in massive vOlumeS USing lOCal TelepHoNe conneCTionS and personAl computers. the
 and the optical data rece ived by an  opti cal  re ce iver  (RX ) is converted to a n electrical signal.
A  phot od i ode( PD ) con verts t h eo p tic al  d ata  s e nt  from  th e optic al transmi tte r(TX) to a cu r re nt and the  TI A is used to  co nvertth isc urren t t o a d iffere n tial v oltage.
T he electr i cal sig n a loutp ut from a drivero ft he optical tra nsmitt er (T X )  is  co nverted to  a n opt i cal sig n al b y  an electro-optic al conversi o n e lement ,a l a ser di ode ( LD )  or  a vertical  cav ity surfa ce emi t ting la s er (VCS EL). T his  op tica l  s ig nal  p a sse s  t hro u ghan optic al  f iberto b e s u bjec ted  toopto- electrical co nve rsio n  by  thePD of  the  o ptica l rece iver(R X).
In the comm unic ation fro m t he  op ti cal t r ansmit ter  (T X) to t he opti c alre c e i ve r (RX), power loss  a t th e connec tion p a rt  o f  the opt ic alfibe r and i n th e  e lectrica l/opti c al  c onversi on  and t he  op tic al/el e ctri cal co nversion  is l a rge and the ou t put current o f  t h e  P D  has  si gnificantly -low ampl itud e  i n s o me ca ses.Th u s, it is preferable fo rthe TI A tohave a high s ignal-to-n o i s e ratio(SNR ) .A ppendix A is a  hard  copy prin t out of t he as sembly l isting co n s isting o f 3 7 p age s,i n cl uding the tit l e  pag e.  This a sse mbly li sti ngissub je ct to cop yright p ro te ct io n.The c o pyrightow ner  h asno ob j ection  to t he r ep ro d uct ion oft he p aten tdi sclo sur eas it  app e ars  in the  Patent a ndT rade ma rk  Office  patent files  o r records,  b utotherw i s e reserv es all copyright rights whatsoe ver .
The  pre sent inve nti on rel ate s  to co mmunic ation  n etw o r ks, a n d  m ore  p articularl y tonetwo rk s pr oviding  document access t o  au thorized subs cri bers . On e a p pl i cat io n  of i nformation retr ieval syst em s  i s to provi d e ( by  displa y, prin ting, or othe r appropr iate mean s)  a c o l lec tion of do cumentsthat is d i recte d  t o a p art icular  f iel d, so  thata  pa rticu lar se tof aut horiz ed  users c an select and retrievea desi red p ort ion of th e c o lle ction. On e ex ample of s uch  asyste m f o r use  int he  of f ice o f ap rofession a lpra c t ic e has a ter m i n alconne cte d  to amemo ry device havingt he collectionacce s s ibl e t o  it(s uch a collecti onof v ideo tap es  or compact  disk RO Mb eingselect ivelyinserte d in t o a co mpat ibl e drive u nit ), the ter mi na l  contr olli ng  the d rive u n it t o access desired p ortio n s  of p a rti cular  o nes oft he m edia havin g documents  of in tere st to  client sof the  pr ac tice. Unfo r tunately,  such  system sareexp ensive  top r ovide , se tup,  and main t a in in  t h atallof th ecost s must be attribut edt o a sin gl e p r a ctice. Al s o , the setupand m a i ntenance f r eque n tl y  requ ires s killsthat ar e  no treadily  av a i lable onsite.
A r e cen tdeve lopmentis  the  w ide  u se of network c ommunica tions ov e r  the I nte r net, on whi ch  a wide vari ety o fi nformat i o n i s avail a ble  in  ma ssiv e v olum e s using local telephoneconn ectio n s a nd pe rsona lcomputer s . Th e
 and_the optical_data received by an_optical receiver_(RX)_is converted_to_an electrical signal.
A_photodiode (PD) converts_the optical data sent_from the optical_transmitter_(TX) to a current and the TIA is used to convert this current to_a_differential voltage.
The_electrical_signal_output from a driver of_the optical transmitter (TX) is_converted to_an optical signal by an electro-optical conversion element,_a_laser diode (LD)_or a vertical cavity surface emitting laser (VCSEL). This_optical signal passes through an optical_fiber to be_subjected_to_opto-electrical conversion by the_PD of the optical receiver (RX).
In_the communication from the optical transmitter_(TX) to the optical receiver (RX), power_loss at the connection part of_the optical fiber and in_the electrical/optical_conversion and the optical/electrical conversion_is large and_the output_current of the_PD has significantly-low amplitude in some_cases. Thus, it_is preferable for the TIA to_have_a high signal-to-noise_ratio_(SNR)._Appendix A_is a hard_copy_printout of_the_assembly listing consisting of 37 pages,_including_the title page. This assembly listing is_subject to copyright protection._The_copyright owner has no_objection to the reproduction of_the patent disclosure as it appears_in the_Patent and_Trademark Office patent files or records, but otherwise reserves all copyright_rights whatsoever.
The present invention relates to_communication networks, and more_particularly to_networks_providing document access_to_authorized subscribers.
One_application of information retrieval systems is to_provide (by_display, printing, or other appropriate means)_a collection of documents_that_is directed to a particular field,_so that a particular set of_authorized users can select and_retrieve_a_desired portion of the collection._One example of such a system_for use in_the office of a professional practice has_a_terminal connected to a memory device_having_the collection accessible to it (such_a_collection_of video tapes or compact_disk ROM being selectively inserted into_a compatible drive unit), the terminal controlling the drive_unit to access_desired portions of particular ones_of_the_media having documents of interest to clients of the practice._Unfortunately, such_systems are expensive_to provide, set up, and maintain in that all of_the costs must be attributed to a_single practice. Also, the set up and maintenance frequently requires skills_that are not readily available on site.
A recent_development is the wide use of network_communications over the Internet,_on_which a wide variety of information is_available_in_massive_volumes using local_telephone connections and_personal computers. The