‘The Picturephone® System: No. 101 ESS By D, W. GROWN, J, R. HORVATH, and ‘TS, PAXTON (Osean pt scive Oa ober 3,20) The yaper acre the methods ond equipment wat é providing Pioturaohane® capatiity to the No, 202 Elsconic Suiting System. nebudad are a Gisuavon nf te obras, design approach, fanvision raguveninte, trae epasity, and uperaticn ofthe widdband itch unit PSU) whieh prose the vides tranemizsion path, Alco dacs are (ewido trunk cet, Seton crows, end Be plysonl characteristics of te WSU. 14 Genera The No. 101 Rlsctrania Switching Syn (ESR), ap elestonie pris ‘vate bene exchange (EDX, Ine hoor povicing customers wilh Centex vad other eseialised sevice since the fret commercial isl lation ate rein Conn Beas, Flor, in November 1903 "Tae eystn, evwshling lasealy of comaol uni (CTT) and one on oro site unite (SU), «Tels the actual intereancetions between “hon Prk, aie service einai en tht vin aneahed basis as ‘heared in the Frbraacy 1000 sen ofthe BSVT-I* Tae &Ue ure cone twas ny meane of dan. Hnks tothe CU a commen, cxatally Inst, fecal pamoae computor which prossee galls inthe ster by mess ff stort poogrem techagus,° Alllough praeses! fr che Ingo eieelid Trequensiea, eb time division clruitry in the Nv. 101 BSE ‘rte nee Ye not eapsble of hain The higher frequen required far wransiieson of vidoo eign, Tw rar to provide video swilahing capably, a wideband eviteh weit (WSU) utilising space division Deltebing hee been dhsigned for woe in paralel with the 24, 94, and SAA emit unite? * 1 Objecties ‘The dinign oljetives for the WSU were bated won the expocted Jw demane for Pictunephone cervie during Uv ills! yeara. Th was 80S may mah exeMEE mpcITUNAT roman, sumAue 187 Alovided che! the WSU matt be econumival sl the 20- eo alin size fad fhat edetione line eapueity uust Ye cally atninietered inthe 4d. ‘The WSU ahoulé eo be compatible wih all No. 11 ESS BUs A, 34, and 4A) an shonld meke a much vee as posible of exiting BU ciety. ‘To hanle audio Wephone teeta, 6 ST is Inostad on the eutore= vite, es chown en Fig, and is oceaelled ya CU Loeaeed ab he cential ofoe, Communications betwonn the CU aad SU pro vied hy mesoa of daca links. To add Picturephone enpabilty 1 this comples, an adjunct WSU cooisting of w fonr-wire epuce division petwerk and a cuplestee wiceband switch control (WSC), iz alo Tnnated om the customers prerises snd ie crnascted #o the &U via ntloriead cases ‘The two video paiva ftom each Muturepkont exiencion and UUEK terminate ox the WSU, while cbe audie pair termsnatie an the SC_ A completa Pzturephows connecticn is composed cf an andia conection in tha SI° and pevallel video connection in the WSU. Al canelatiog seoted to usec tae video paire wilh on audio psi is pat of che wored procrim informatio ix the CU, which ttiminates the need for ditootory namaber e2angce ‘when equinning an ‘dio ine wich Pletosephme eervice, The WSU adjunct eebewe utizet existing Gata links, sopervcory and signaling cieute oxrvive seule, BH S ae we ig Stem shin so 1OL mae cor ‘an insoning- and ontgoing massege c-ewts vvmlained ia tbe 2C, 0 ‘well ee all itching fumetioneseeoeiatod wish Use aud pai. Mose ftom the CU to the WSU age iwi in sel form over an exale ing ata Tok tothe SU and ave Arete! es naenal aio reszoses by the SU until datetion of the video sdsxeeo ootur. The mesergo is then converted to pastel fort aad gata! ver a TIC bu to the WSU. "Te cieuilry roqaiel lo detest she video woes and ene the video miei tu tie WAIT i ees inte division coutsls (LCi Dtnd 1 of fhe SU, Back wicetand switch control che WSC is Aivety assorieted wich its eomaetive TDG in Une BC Ta ante Zone fiven TSC lo proce video maga, tho message mus be reveived by the TDC caoeiatol with thet WSC. Whau a TDC is ceed By rintenarea, che eoreyponting WRC Wars ite ebility to process vidoo rmeaange, “The WAU omrinesee with che No, 1U1 WSS oostzol unit vic fenven supervisory ear pants Uae his boa ied “a the ST anaes. ‘A change of tate on a tenn plat Lesmaniie ne bib of meainterance infocrsarien to tho CU, All neceeary ait2enance infozmation seg ing the status oi boll wilt ww ol onto and tke pers! eran ritsion chacks mace an the video pcre 4 se lo sie CU Hough Unee even eas nant, sn Tranoiseion Path "Th network, which a shows. in Ag. 2 at ite mesimum sige 07 192 terminate, is beially& felsed Ul reesinny nore ila saad by §, Zour-rice ferred switcher The velwork's gelbotieated ane smey be eoatzalled by drhor WS Tn encer to seet the objectives of being eeomcraiee! ub the at sine (BD ta 20 ines) end uf ening che notwenk to geow eicenty, Whe network was mdilavien’, Wodules OA anal OR sre entra, el fontairing four ftatage smivenon 16 juaotar ciceite, and tro rcond-etege switches, Mfodulas 1 and 2 are identicel ard. conti Siaht ist-eiage swivenes each A: irvrenanemiona betwoia rod sa well we to tho wri site contol sz» conneetriee. ‘work prow on on aed-on hss and sllows tbe addition of raadules withews ditushing existing customers, “With the pros on 0 er oP more rans She network eoaie of jit concectratare and “our second-stage stitches. A amneentralae Faniaina © maxirion of chive fesse thes ih wiles 0, eo TO Rem 209 10, al 20 comprising eneertontas et. Te many be reen by locking at canectarwar (that 24 input ierminn’s hove acoeee to eight Tinks esuing in # cexcentacion sei u! 3: ‘Af the oza mice sie wich only mele 08 provided, half of the sinks (thoee normally tsrminatad ox module UB) appear to be unter. mimi Henever he ara so azzarged tae tasty lik a8 be plugged aly the sositinn w medue 04 thet 3 normaly oeausied De Bake Lowa module OB, Ts Wis wey, fall-acooss notrort ix fehioved nk Ue $2 lori sine with vo haxdware er softwero mode caves, Whe: mnie OD 's added, the uawork je full avoene wich a erinn: capacity of 64, "The ealdition af snodele 1 inerests Ue ler= mata capanity to 1a acd te gouceneation sto wo 2:1 The wition of modulo 2 irerensoy te ever te fis masitoom of 192 enmaines, hed he eoneestation ei lps Cerna to Kins to 3:1 "Tro eenatate eee of ke, termed A and B links, a weed w ion tomsren the Rilo sono stage enitehe, Every eoanestion three Ue network invu'ves eve A Tira ne B Tk the Blink provide f sovigh-tareugh eomceioe Yertcen the fet- and oecanerage {creed evisu, ‘Tue A liks, howe, Leanyose thew deo pais via jimetoreitenit shows i. Fig. 8. Ths functor eleo aliows the wideburd ile, control ta tvuter the in pate for Seanemifsion testing, 10 sappy dha supervisory sgnal tn the eistomer station aqepament, fad Lo exh sine he ao cennert'on arta the maori eth hen boin estblisned. Thin latter fumeion asrcse the: the f tints gee Moved and epenes with no surert dowing ia past. Wilh Ube Tiss inteoonneesiog the fra abd secerd-etage G10 me mua emia aenson, Joeessn, ranneanr 16r ritehes aa shows in Tig. 2, thore srt eight diet paths between pore loested on sparta coreorsrwre and Jot paths Setreen Pustie ievolved on an intravonecslrau call “Lines and trunks ere distribute! orer Ube siahea (ar apposed to filing te eviteher ore atm tel i ender co balareo te era Ton cover the lin, The iat 32 port of Pe vesanrk, 10 on mod OA wed 16 fr ried Od, ere equipped for use us us al Sthancant pects asl] fs nes, Thee porie eze proviced with » “copa eincait and the teens of apnipng the signal sora etetonsy ingot “he ideo tran tit par, The lnpheck vir, ie needed at 2be WSU un ‘run anc iitendact porte to subetitiee fr the inphark ro-moly provided t ‘the eubeeioer'sstetion vet og ha punts, The stetioory isage Ss ‘exmittod ab eppropriato intervuls to the Gitanl petty on attandant nuded cele doving the Hine fe eal ie ing peooeoed. Four ofthe 42 ports aay daioua for sSvancast we. ine rhe stendant bas the bly co hold ap to sit ealls 0a ho eoneae lap, ali cna have the fapacky to aoreee ones party being Fold, Tn ander to reduce the Dbloekiog probability on ateerdeat-bundled eas el evncle's eon ected to exo pons leated on separate eoaccrizator, 9 Palen Path oth tho dist- end acomd-tege porters of bre network wile aucerd § by & feuzovize feveed switelee. "The eontrol windings bchin the ewiteh cre eres ecaneetod slong Ue -oe2 Rnd eaturns Fight harieenta doada, cigkv verces] ends, a wormon Turina fa « conuziou verie) la ace brewght out from rach swirl Fig. 4). By making slog a given sorizontal and given veriea via Ue eoiron arizona! and wsrca lead, the selosted fous-wize era nak is closed. A taltesiect, along itaor a wetin! of hovizotal, sa the enezspedat to open. The Horioua! aed sertieal lenda exe matipled among the switches seeosnved with 4 roduc, eo that om a0y given module ery eight verve “ows pt heviamtal Teede, ene common vertial 09d, aad ‘oe comanrt zontal les emenge. An ell cuses the palec path exsethy Darul the transnsion pat ‘Tha eaalistonent of a pach through the netmork ay be Mette sing the iaussuge cnteris shaw in Fig. "The ratske oll iy rected by n aot of ive nprog lay “over Ut operate dirootly from the pasty widesse wad Fre weann-sae smith fort ation the reeesage. The party dress aro cow posed af Uitoe wlan whieh specify *be nodule, witch levs, and neswork eoneentzarar of 0, 101 8 on 012 may wh, averse TReHEMAL SOUND, FARRAR 12 ‘the party port, The A and Finks to be used in the ennaeetion are detarmcnod by the eesend-age amivea bite and the respective concen teatar cambute for pasty L we pany 2 "The party vertioal tramestary opeare fem the module snd awit level bile (0 seleos L out of 24 awiteh vereal leads, end tho party toasco:cator translators operate from the parcy eoncantrxlor bite to Grket une out of eight network coneeaatore (Fig. 4). The output fof the eonoenteator (rnaslatore operates « per switch path select felay for cach fermeed ewiteh on Ue selvted concentrator. Tn a Sine manner a path aclece relay amociated with « sonnd-siage fmvitah ir apercted through the gevosd-atage ewitch tranelatr. "Al tranalacors for both pustie opecace immediately pen recat of Uwe manage, After the trmo'slona beve operated, the palo path is lowed soros the pulser by zolys ENP! wd HPT tae the per. Sines 0 connest order ie being performed, the disconaoet relay (DTS) vill ronnin umoperated throughout the tonneetprocedare. ‘The Get Dulsce firing simultaneously clases the first-stage eviteexcespint to Gonaect party 1 to the A ick, wed the second-stage awiteh erospoint {o comers the A link to te B Tink. The pulbe pech rasa through the party 1 vesieal teanaator, ap the elcted vertia! lead o the foreoe Dviteh elected ty the eoweintinior imnslator, areund the commen Yerveul (PY) and horigenal (PH Tole, ard eal on a borzextal level scloiel by the operated cseond stage witty pa sell relay. The pulse then pasate chrough the siectod acondsloge wviteh and returns o the poe. The horizontal end vertical levee on the wecond- age ewe are respectively existed by tho drs-stase path select relay and a separate pary 2 eonesnirstor drama, Fig, 5 Masags cots, so. TOT nt aa ‘The oscond puleer fring counects party 2 ta the I ink and occurs ster olay ENPI is relensed end ENP? is operated, ‘he pulve path in Similar to thst ofthe parsy 1 cennert but docs nat includ the aerand- age ently "The REV relay is opemted from Tue pulse polarity Bi in the mas. sage and controls che diretion of the puleer Ging, The direction of the pulse in used ox ttle and attendant port to operate or lee the bipolar femeeds for apoliceton of the metalic loopback or si tlonary video-image signel on chese port, ‘On the tarmination 9° each talking sopnection the Link ersspeints sre opencé to prepare the link for the tranamietion cela whieh will he eandonied cn the nest eoriustion, The adr is pons’ in tra stages whieh resemble © eonrect ener axeape in the following respects ‘Tho DIS relay ie operated cauring a tsliieeck along the vetiale of tha Gret-atage awitees thevehy Tleseirg parce 1 and party 2 fom their asoeaced. Inks, ‘The soonisrage sith eropmint main ‘operates, bb ill be teeaeed ly thn mak eotsecton wal ihe {he Horizontal or vertical lead asocitea wia "For miataneneo and initialization purpose, = is desnuble to med ity the diceonneot order ta Ua say eonrecion on Line fs rleweed vwithots specifying a par adress Poe this pmpese a clsaninet men sige is forme in which em eeal 68am forthe mule od Tevel ite in rsher or hn pasty ulebnees, This rultution enueos he Aircon’ pls to he tearaeite’ at tho ile epee fy ho eoondesage smite ant concenteetar numer inthe party addres The ake exentie! in cariain cal! procaing sldalinns to exer e fx order that sors oly one port appearacce, An octel 37 eubetia:ed for the radulo and level bis in tae pesey eddneas 9 cause the pleer so fre into a evetve Ines Iaving toe fnbstage onospoinls isosinted with thet party unchanged ‘ronan Teste Siner the trananitson requitmente of the video farilioe ze stringent and charging takes place upon completion uf the sudo path, ici imperative that th iterrity of the vidoo loop ba checked Delure billing tale ple. This ie nesemplishd (Fig, 6) im the WSU on & per eall basis at the time tho isi connestion between two parties being esteblished. Oa sobsequent conncetion, during eal tranefere for instante, the treaeuistion chee s1e omitted fom the ennnect orders. As explained previously, the extabisment of « pa Uarough the network aecure in twa elagée. On each luge of nn inital eoonee Gls cae ae, evan ZEeUNTCAE soURNAL, PMATRY whl tion s flee gcousd at ie wide from tho junto ercuit on ech lend ‘of the video pers locking tomend the party being eammected co the Tink, This ae i made in onder vo detect the proses of sabe attached 4p the link through stuck nebwork erospoints. Afterall nebwork ‘crosspoint have been ele a Ul. made on tho tla! video path to ‘heck: continuity through the nebwurk smoapoints and ovee Lhe video loop to the etetion epparsiae The false grou! tat relics un a fle ground tht i placed on eas Jead of the video paize by either the vation set equulver oF the ‘squalin Ineated at the WSU, ‘This yround sbould not bo prevent fn any lad of « fink wihin nn ile junctoreixeut sine each pasty $x discomnectod from its Hk wen »lalking ooeacetion = veriated ‘Toeretoze, «stele eroepoize muy by deleied by looking for grounds fon the video pairs sn the junoiar sees Defore the network ers pointe te eosed. All srawaision ies wnplay a A2elig tone exe lind a T2kis taned drievtar loealce in the WSC af the WRU. On the tee stage of Ue sometting, befene party is conned to the A link, sbe FE mlay of the Sunstor olsuit ie aperald to bring the video onire Frou Both pastice fo cho WSC. The FOGY Mig. eeneion o,