Tesis previa a la obtención del Título de Ingeniero en Electrónica y ...

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í Mode initialization, dynamic mode switching and mode O forcing Audiovisual termináis will be connected to digital networks where other kinds of termináis will also be connected: 3.711 termináis but also data termináis, telematic termináis, servéis, etc. When compatibility between the different .ervices involving those termináis is required, an initialization procedure is necessary. Vhen automatic compatibility ís required, a procedure based on the sequences defined in 5 is used. ;or cali transfer or mode mismatch recovery, it is necessary for termináis to opérate ín the common mode OF and a aode O forcíng procedure Ís required, again based on the sequences defined in 5. \.t the commencement of the cali, after cali transfer and after the procedure of 6.3, there is a need for an initialization irocedure to ensure that the two connected termináis can opérate in the most suitable common mode. í.l Mode initialization procedure ¡.1.1 Single cnannel ^he initialization procedure begins as soon as a connection message is received from the network, or any indication aeaning that the physical connection is established. U the beginning of mode initialization, each terminal wíll start to transmit Ín mode OF. ?he receive part of the terminal should be in frame search and the receive audio is mode OF. Sequence A is started. Jpon completion of sequence A according to outcome I (see Figure 2 outcome la), sequence B will commence. ?he BAS code which is sent in sequence B is calculated from the knowledge of the capabilitíes of the local and distant erminals and is used to switch to a suitable working mode. Thís process may involve terminal procedures effecting hoices made by the user or preset in the terminal. An example illustrating conformance to a defined teleservice is ;Íven in Recommendation H.320. n the event of outcome II, the terminal will switch ¡ts transmíssíon and reception to mode OU. The receive part of the erminal should remain in frame search throughout the cali. n the event of outcome III, íimer TI Ís reset and the terminal remains within sequence A. 'he initialization procedure is completed when both termináis have switched to the desired working mode(s). .1.2 Additional channels L possibility of addíng more channels is established from the capability exchange sequence, The calling terminal may aen immediately begin establíshing the additional connections. When each is established, ít transmits only FAS nd BAS on that channel, setting a timer Ta of valué 10 seconds. Synchronization with the ínitial channel is performed ccording to 2.7/H.221, When the incoming A bits on additional channels are observed to be O, mode swítchíng to ccupy sequentially numbered channels is initiated by an appropriate transfer-rate command BAS. If the timer Ta has xpired without receiving A = O, it Ís dealt with as a fault condition. LS the buffering process may involve the insertion of additional delay in the initial channel, which may already e carrying user information (speech, video, data), it may be necessary to make some provisión for this interruption E.g. short-term muting of audio output). Ls additional channels achieve synchronization they are sequentially numbered using both FAS and BAS numbering as rovided in Recommendation H.221. tn example of mode initialization on two channels is given in Appendix I.
4WOA TX m mode OF, BAS-cap.cycle FAS searchfl) Yes ^ \o \1 expired? Recovered frame alignment? Outcome Illa (indícate faült Note incommg BAS-cap.cycle Incoming FAS in bits? Put outgomg SC bit? All-ones ¡n bit 8 Incoming FAS in bit?? Shift mcommg bits 1-7 til! FAS in bit? :Óütcomé:lá:;.. Outcome: Ib a' Unless there is octettiming and It is certain that a restricted network is notinvolved, FAS should atthis pomt be sought throughoutthe ¡ncoming signal. ' Outcome IV: communication is ¡mpossible, because it is notknown which bit is lost or stuffed; the terminal should so indícate to the user and wait c) If the cali is known to be ínter-regional, itis advisableto mute the loudspeaker(s) until the audio decoder ¡s setto the corred coding law. FIGURE 2/H.242 Initial capability exchange - General case TlS14250-93/dDl
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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
Page 105 and 106: Las normas de codificación de imá
Page 107 and 108: 6 Piso SIMBOLOGIA EH3 = Hub = Eieme
Page 109 and 110: Calle Japón MAPA DE UBICACIÓN 0 9
Page 111 and 112: FOREWORD e ITU Telecommunication St
Page 113 and 114: INTRODÜCTION e purpose of this Rec
Page 115 and 116: Bit number 1 2 3 * 5 6 7 8 (SC) S u
Page 117 and 118: e FAW consists of "0011011" ¡n bit
Page 119 and 120: ime alignment is defined to have be
Page 121 and 122: le decoded BAS valué is valíd if:
Page 123 and 124: ec. G.711 50 1 : 57 : 106 113 120 5
Page 125 and 126: B!t1 M \ A2 3 A3 TS1 Inltial channe
Page 127 and 128: [0] [1] [2] [3] [4] [5] [6] [7] [8]
Page 129 and 130: ;utral j-off, U a-off, F -law, OU
Page 131 and 132: id-Ioop Video loop request (see Rec
Page 133 and 134: '29.97 '29.97 id-imp(R) ideo-ISO V-
Page 135 and 136: [0] [1] [2] [3] [4] [5] [6] m [8] [
Page 137 and 138: irsor data on in LSD Cursor data sw
Page 139 and 140: INTERNATIONAL TELECOMMUNICATION UNI
Page 141 and 142: Recommendation H.230 1 Introduction
Page 143 and 144: 3.4 C&I related to simple multipoin
Page 145 and 146: TABLE 1/H.230 Code First 3 bits (00
Page 147 and 148: FOREWORD Che ITU Telecommunication
Page 149 and 150: ¿Vnnex A — Identification of the
Page 151 and 152: 'he total capability of a terminal
Page 153 and 154: ourBAS attríbutes are commands: th
Page 155: ame reínstatement sequence C ¡tho
Page 159 and 160: TERMINAL X Incommg signal ramed Out
Page 161 and 162: ) Additional channels idle — This
Page 163 and 164: iv) wait for confirmation that the
Page 165 and 166: ) Procedurefor activation and de-ac
Page 167 and 168: 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
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5.4.2 Generator polynomial g(x) = (
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ANNEXB (to Recommendation H.261) Hy
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A video sequence lasting more than
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FOREWORD be ITU Telecommunication S
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System description 1 ' Block diagra
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,3.2 Terminal types of visual telep
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)IIowing the conneclion esiahlishmm
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case the cali is dísconnecied for
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flaco wcu Maintenance Conference Te
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) Loop ai lerminal-nelwork inlerl'a
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MARTIN E. ZULTOSKI, Aplicaciones de
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