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4.1.6 Phase CA - Cali set-up of the additional channel(s) >Ilowing phases Bl-3 and B2 ¡f relevan!, ihe communicatíon phase C proceeds on thal channel. If additional channels ive been requesled ihese go also ihrough pha.se A (he.nt'.e ihe nomenelaiure "Phase CA"), exacüy as in phase A above, id addilional cali sel-ups are performed by Ihe termináis. On each of Ihe e.slahlíshed channels H.221 framing i.s overlaid ee Note). NOTE - During phase CA an imermediale audiovisual mode could he offered on ihe ínílial channel used for inH¡aliy.ation, ilil ful! completion of inilia|Í7.a[inn phase. ,4.1.7 Phase CB1 ~ Mude ¡nitialr/.atiim on additional chunnel(s) .4.3.8 Phase CBl-11 sing the procedure províded in "Recommendaiion H.242, frame and mullU'rame alignmenls are gainud. ,4.1,9 Phase CB1-12 ynchroiiization of the channels ís aehieved. ,4.1.10 Phase CB1-2 (terminal procedure) 'eterminatíon of ihe appropriate mude ui be [ran.smitled. This WÍII normally be (he highest common mode, bul a lower ampatible mode could be chosen instead. .4.1.11 Phase CB1-3 (mode switching) ¡oth termináis sw i tch lo ihe mode ihey ha ve. idenlified in phase B 1-2 u.sing ihe. procedure of Recomm en dallan H.242. ¡sull. NOTE - Mere ngain, if Ihe lerminals have noi holh adopted the same comrnon mode, an a^yriimelric communícation will .4.1.12 Phase B2 (or CB2) - Establíshmtínt of common paranieter.s 'hís phase eslablishes common operalional parameler.s specífic to visual le.lephone (e.g. eneryplion) afler phase Bl rocess Ís finíshed. Capabililíes or requirerntínis ni' ihe ref.e.iving síde are firsl indicaied Ihen ihe üending side decides peral ío nal pararneiers and con i ruis Ihe rüceivmg si de.. HAS codes i'or ihi.s purpure are defined ¡n Recommenalion H.221. .4.1.13 Phase C - Visual telephime communicatttin ti the case where more than one channel i.s usad, there will be intermedíale phases CA, CB], CB2 as described ¡n this ubclause. Ltkewise, if additional c.hannels are dropped during ihe cali there will be intermedíale phases CO, CE as lescribed ín 3.4.4. The provisimus of ihl.s .suhitlaustt apply lo any channel, Inillal or addilional, for which phases Bl nd B2 have been compleled and phase. I) nol yel siarted. 1.4.1.13.1 Mode ¡rvvitching ^ccordíng lo action by either user (for example, siariing a facsimile machine) a differe.nl mode from Ihe highesl common node may become more appropriate. Swilching lo lilis mode. i.s made acxording lo [he procedure of Recomnendation H.242. 1.4.1.13.2 Capability changu Phe ustir may change ihe capabilily of h¡.s terminal during Ihe cali (for examplc. by connecling or swílching-on auxiliary elemaiíc equipmenl); ihe terminal musí initialtí ihe capabiltly e.xchange. procedure. defined in Recommendalion H.242. L4.1.14 Phase D - Terminatiim pha.ve L4.1.15 Phase Di (terminal procedure) iVhen one of ihe users hangs up, ihe terminal involve.s phase í)2 direclly. 3.4.1.16 Phase D2 (mode swítching) Mode OF is forced according lo Recomniendalion H.242 (or laking inlu acuinint Ihe result uf phase DI if differenl; for further study). : ' Recommendation H.320 (03/93) 7
case the cali is dísconnecied for some rea.son, il may take a long lime ÍJ' il keeps awalling reacííon from ihe remole rminal, and receplíon or ¡niliaiíon of ihe ne.xl cali rnay líe blocked. 1SON disconneclion should he given príoriiy over ihe .242 cali terminaiíon procedure. A líme-oiu of lwo secuild.s is' suggesled. 4.1.17 Phase E - Cali terminatiun (reléase) he terminal which has inilíated Ihe hang up .sends messages over Ihe D-channel wílh respecl In all channels and idles all 'them (ihat means no more informalinn senl over). t Ihe other lerminal, the firsl discnnnecí message receivr.d wíll idle all channels. he actual disconnection occurs al reeeplion of Ihe oiher di.sconneci message(s). ,4.2 Exceptional procedures for phases A and K i case of unsuccessful oulcome during phases A and R (due lo many causes), excepiúmal proeedures are provided ín rder to ensure a suítable service. The maner Í.s for furlher sludy. ,4.3 Exceptional procedures during pha.se C uring Ihe actual exchange of audiovisual dala, pmhiems may oüeur in sorne channels. Fallhack procedures, managed hy e lerminal are aclivated. The deseriplion of Ihe procedures and ihe appropriale indícations are for furlher study. ,4.4 Addition and drnpping of channels during u visual telephone culi .4,4.1 Addition ccordíng lo aclíon hy a user (for example Ihe aclivalion of auxiliary equipmenl) one or more addiiional channels are ¡quested. The procedure follows those. descrihed for phases CA and CB1. .4.4,2 Dropping 'wo phases are envisaged. .4.4.2.1 Phase CD1 'he common mode, appropriale tu Ihe channel(s) which remains, is selecied. .4.4.2.2 Phase CD2 'he mode swiichlng procedure of Kecomniendalíon H.242 is appliei! lo involve Ihe mode idttnlified ¡n phase CD1; the ímainíng channel ¡s the channc! used for iniliali'/alinn (see phase A), ll suppiiris an appropriale fallhack mode. The latter is for furlher sludy. .4.S Transmission and display of pictures at the síart nf a visual telephone cali iccording to ihe chosen lerminal procedures, píclures may or may nol he visihle lo liolh users as soon as ínitíalixalion is omplete. In the case thal eilher phase Rl-3 or phase ('Hl-3 has aclivuled a common mode, including video, muiual isibility of Ihe users is po.ssihle. 'he followíng ilems collect allernalive procedures which can he used lo suspend píclure display unlil user inlervention by mutual agreemenl orolherwise) causes piciures lo he displayed. 1) No video íransmitted - !n phase BÍ-2 and (if relevanl) phase CB1-2 ihe mode selecled includes video OFF. During phase C eilher user may unilalerally swilch lo video ON, alternalively, his lerminal may send the C&I BAS code V1R (video indícale ready-to-aetivate), huí not swilch to video-ON unlil ViR is also received from ihe olher terminal. While the incoming video-OFF stale remains, the visual lelephone screen should display a symbol or message ¡ndicaiing Ihi.s (i.e. there is no faull). As already noled ¡n 3.4.1, phase Bl-2, ihe requesl for addílional channel may, according lo terminal procedure, be delayed whilr, video-OFF is mainiained; user aclion lo aelivate video would ihen resull in procedure phases CA 1, CB1 (CB2 ¡f required). I Recommendation H.320 (03/93)
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ESCUELA POLITÉCNICA NACIONAL FACUL
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2.2.2 Clasificación de los servici
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ESTUDIO Y PLANIFICACIÓN DE UN MODE
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CAPITULO I 1.- PRINCIPIOS DE FUNCIO
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Para el proceso de liberación de l
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1.2 NORMAS DE COMUNICACION.- Los co
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• Control de Sistema: unidad que
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2. Para múltiples canales de B/H0|
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1.3.- ALGORITMOS DE CODIFICACIÓN Y
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quiere decodificar, el rendimiento
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Codificador de Capa Diferencial .1
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entrada son formateados para la com
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modelos toman ventaja de la baja se
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Quinto. La estructura y los paráme
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de búsqueda. La mayoría de aplica
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avanzada) o del recuadro de referen
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LA RED DIGITAL DE SERVICIOS INTEGRA
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2.1.1 Establecimiento de una RDSI.-
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SoT a) Escenario Irrtercerrtrales b
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2.2 VÍDEO COMUNICACIONES EN LA RDS
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A continuación se describe el tipo
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2.3.2 RDSI de Banda Ancha (RDSIBA).
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ealizar enlaces de comunicación en
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Esto era imposible para una red STM
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ase de la estructura de esta aplica
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Esta aplicación genera muchos y mu
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CAPITULO III 3.1. EL VIDEO TELÉFON
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3.1.1.3 Modo de Operación.- Para e
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El video teléfono Picasso esta com
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Pórtico Paralelo Procesador Host M
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Mbytes de memoria para compresión
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mouse que permite realizar este tip
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eco de la habitación, permitiendo
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obtener una buena imagen, un correc
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El circuito de procesador lo diseñ
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Tx Fkj. 3.5 Diagrama de bloques del
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VIDEOCONFERENC1AS PUNTO A PUNTO A T
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video en software se apoyan por lo
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ejemplo, una empresa de diseño pod
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CAPITULO IV ESTUDIO Y PLANIFICACIÓ
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Para realizar la transmisión de'in
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Características de las Fibras Máx
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RELLENO DE GRASA FIBRA DE V1DEOCOM
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) Pérdidas por Absorción Las pér
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Red en Estrella. Las redes en estre
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La decisión con respecto al númer
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C. Determinación del Promedio de P
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La atenuación máxima normalizada
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utilizará enlace aéreo a través
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Manhote Hardware 1 Cajetín de empa
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En el presente diseño se plantea t
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4.3.1.5 COSTOS TOTALES DE OPERACIÓ
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Las normas de codificación de imá
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6 Piso SIMBOLOGIA EH3 = Hub = Eieme
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Calle Japón MAPA DE UBICACIÓN 0 9
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FOREWORD e ITU Telecommunication St
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INTRODÜCTION e purpose of this Rec
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Bit number 1 2 3 * 5 6 7 8 (SC) S u
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e FAW consists of "0011011" ¡n bit
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ime alignment is defined to have be
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le decoded BAS valué is valíd if:
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ec. G.711 50 1 : 57 : 106 113 120 5
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B!t1 M \ A2 3 A3 TS1 Inltial channe
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[0] [1] [2] [3] [4] [5] [6] [7] [8]
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;utral j-off, U a-off, F -law, OU
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id-Ioop Video loop request (see Rec
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'29.97 '29.97 id-imp(R) ideo-ISO V-
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[0] [1] [2] [3] [4] [5] [6] m [8] [
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irsor data on in LSD Cursor data sw
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INTERNATIONAL TELECOMMUNICATION UNI
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Recommendation H.230 1 Introduction
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3.4 C&I related to simple multipoin
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TABLE 1/H.230 Code First 3 bits (00
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FOREWORD Che ITU Telecommunication
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¿Vnnex A — Identification of the
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'he total capability of a terminal
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ourBAS attríbutes are commands: th
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ame reínstatement sequence C ¡tho
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4WOA TX m mode OF, BAS-cap.cycle FA
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TERMINAL X Incommg signal ramed Out
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) Additional channels idle — This
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iv) wait for confirmation that the
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) Procedurefor activation and de-ac
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Rec. V.35 VT DSU VT 0 sil E g DDS o
Page 169 and 170: Note that the valué (111) [24] is
Page 171 and 172: To ensure that the picture builds u
Page 173 and 174: Appendix I Initialization: Case of
Page 175 and 176: TERMINAL-X- Start communication TER
Page 177 and 178: TERMINAL "X- Swltch to mode OF L Se
Page 179 and 180: Appendix IV Examples of symmetrical
Page 181 and 182: Appendix VI Hierarchical capability
Page 183 and 184: or! Error! ot a valid leñame. INTE
Page 185 and 186: iecommendation H.261 'onsideríng e
Page 187 and 188: ,4 Source codirig olgorithm . . ,,
Page 189 and 190: 3.2.2 Motion compensation FIGURE 3/
Page 191 and 192: 3.2.6 Clipping of reconstructed pic
Page 193 and 194: 4.2.1 Picture ¡ayer Data for each
Page 195 and 196: 4.2.2.5 Spare Information (GSPARE)
Page 197 and 198: Intra Intra Prediction ínter ínte
Page 199 and 200: CBP 60 4 8 16 32 12 48 20 40 28 MVD
Page 201 and 202: 1 3 4 10 11 21 22 36 2 5 9 12 20 23
Page 203 and 204: Run 2 2 2 2 2 3 3 3 3 4 4 4 5 5 5 6
Page 205 and 206: FLC 0000 0001 (1) 0000 0010 (2) 000
Page 207 and 208: 5.4.2 Generator polynomial g(x) = (
Page 209 and 210: ANNEXB (to Recommendation H.261) Hy
Page 211 and 212: A video sequence lasting more than
Page 213 and 214: FOREWORD be ITU Telecommunication S
Page 215 and 216: System description 1 ' Block diagra
Page 217 and 218: ,3.2 Terminal types of visual telep
Page 219: )IIowing the conneclion esiahlishmm
Page 223 and 224: flaco wcu Maintenance Conference Te
Page 225 and 226: ) Loop ai lerminal-nelwork inlerl'a
Page 227: MARTIN E. ZULTOSKI, Aplicaciones de
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