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27

User manual

Optical Transmitter

ENGLISH

For a DTT signal (Bw = 8 MHz), the equivalent noise will be:

EIN = -147 + 10 log (8 exp6) = -78 dBm (31 dBµV)

For a digital TV signal in satellite band (Bw = 27 MHz), the noise power at the input will be:

EIN = -143 + 10 log (27 exp6) = -69 dBm (40 dBµV)

The value of EIN for link losses higher than 2 dB will increase according to the formulas in Note 6.

To sum up, in the following table it is shown the equivalent input noise for different optical losses, for both TV analogue signals in TV band
(frequency=800 MHz, BW=5 MHz) and digital QPSK signals in satellite band (frequency = 2GHz, BW= 27MHz).

Optical losses

Maximum gain of the

link

Equivalent input noise 

(analogue PAL TV) (800 MHz)

Equivalent input noise 

(digital QPSK TV) (2 GHz)

1 dB

16 dB

-80 dBm      (29 dBµV)

-69 dBm         (40 dBµV)

2 dB

14 dB

-80 dBm      (29 dBµV)

-69 dBm         (40 dBµV)

3 dB

12 dB

-79 dBm      (30 dBµV)

-68 dBm         (41 dBµV)

4 dB

10 dB

-78 dBm      (31 dBµV)

-67,5 dBm      (41,5 dBµV)

5 dB

8 dB

-77 dBm      (32 dBµV)

-67 dBm         (42 dBµV)

6 dB

6 dB

-76 dBm      (33 dBµV)

-66,5 dBm      (42,5 dBµV)

7 dB

4 dB

-75 dBm      (34 dBµV)

-66 dBm         (43 dBµV)

8 dB

2 dB

-73,5 dBm   (35,5 dBµV)

-65 dBm         (44 dBµV)

9 dB

0 dB

-72 dBm      (37 dBµV)

-64 dBm         (45 dBµV)

10 dB

-2 dB

-70,5 dBm   (38,5 dBµV)

-63 dBm         (46 dBµV)

11 dB

-4 dB

-69 dBm      (40 dBµV)

-61,75 dBm    (47,25 dBµV)

12 dB

-6 dB

-67,5 dBm   (41,5 dBµV)

-60.5 dBm      (48,5 dBµV)

13 dB

-8 dB

-66 dBm      (43 dBµV)

-59 dBm         (50 dBµV)

14 dB

-10 dB

-64 dBm     (45 dBµV)

-57,5 dBm      (51,5 dBµV)

15 dB

-12 dB

-62 dBm     (47 dBµV)

-56 dBm         (53 dBµV)

16 dB

-14 dB

-60 dBm     (49 dBµV)

-54,5 dBm      (54,5 dBµV)

17 dB

-16 dB

-58 dBm     ( 51 dBµV)

-53 dBm         (56 dBµV)

Содержание 8674

Страница 1: ...Copyright Telev s S A TRANSMISOR PTICO CANAL DIRECTO y CANAL DE RETORNO OPTICAL TRANSMITTER DIRECT PATH RETURN PATH Manual de instrucciones User manual...

Страница 2: ......

Страница 3: ...tico Canal Directo 5 1 2 Receptor ptico Canal de Retorno 6 1 3 General 7 2 Balance del enlace 8 2 1 Canal Directo 8 2 2 Canal de Retorno 14 3 Descripci n de elementos 16 4 Ejemplo de c lculo del enlac...

Страница 4: ...eraciones de extracci n protecci n de los mismos Colocar siempre las tapas protectoras a los conectores de los equipos que no est n conectados a cables para evitar que el haz l ser pueda alcanzar los...

Страница 5: ...siempre al menos 10 dB inferior al nivel de los canales de la banda TV Entrada de radiofrecuencia Conector de entrada RF F hembra Ancho de banda 47 MHz a 2150 MHz Impedancia 75 Ohm P rdidas de retorn...

Страница 6: ...m P rdidas de retorno 12dB Nivel m ximo de salida 2 tonos IMD 45dBc Nota 4 104 dB V tono Nota 4 IMD Distancia de intermodulaci n Para un n mero mayor de canales la f rmula a aplicar para obtener la re...

Страница 7: ...a OK Apagado Atenuaci n ptica 15 dB LED de potencia transmitida canal directo Encendido Potencia transmitida OK Apagado Potencia ptica transmitida err nea Alarmas Contactos abiertos de rel libres de p...

Страница 8: ...una canal digital de sat lite de 27 MHz en QPSK para p rdidas pticas 1 dB Nota 7 69 dBm 40 dB V Nivel m nimo de entrada Vinmin para canales de TV anal gica C N 46 dB para p rdidas pticas 1 dB Nota 8...

Страница 9: ...dB P rdidas de un repartidor ptico de tres salidas 5 8 dB P rdidas de un repartidor ptico de cuatro salidas 7 4 dB P rdidas por cada conector ptico utilizado 0 5 dB conector As por ejemplo un enlace d...

Страница 10: ...ejemplo 144 dBm Hz en 800 Mhz para unas p rdidas pticas de 5 dB 2 Para p rdidas pticas comprendidas entre 8 dB y 13 dB ambas incluidas EINn EINn m nimo 5 dB 1 5 x p rdidas pticas 7 dB As para unas p...

Страница 11: ...banda de sat lite moduladas en QPSK frecuencia 2 GHz Bw 27 MHz P rdidas pticas Ganancia m xima del enlace Ruido equivalente de entrada TV anal gica PAL 800 MHz Ruido equivalente de entrada TV digital...

Страница 12: ...odo de ejemplo los niveles m nimos recomendados de entrada al enlace para se ales de TV anal gica en la banda TV y para se ales de televisi n digital en la banda SAT para diferentes valores de p rdida...

Страница 13: ...on un enlace de aproximadamente 30 Km con dos conectores pticos y ning n tipo de repartidor ptico o bien un repartidor ptico de 4 salidas y un enlace de 14 Km y sus correspondientes conectores pticos...

Страница 14: ...ara p rdidas pticas 5 dB Nota 11 73 dB V por canal Nota 10 Ruido equivalente de entrada normalizado EINn Es el nivel de ruido de entrada normalizado para 1 Hz El valor de 149 dBm Hz es s lo v lido par...

Страница 15: ...m Hz 10 dB 2 x 10 dB 10 log 5 exp 6 72 dBm 37 dB V frente a 38 5 dB V para el canal directo Ver tabla en la Nota 7 El nivel m nimo de entrada para esta misma se al y una C N requerida de 46 dB ser de...

Страница 16: ...2 5 9 5 6 3 4 7 8 10 1 1 2 16 Manual de instrucciones Transmisor Optico 3 DESCRIPCION DE ELEMENTOS 1 Entrada RF 47 2150 MHz Canal Directo 5 30 MHz Canal Retorno 2 Salida Optica Canal Directo 3 Entrada...

Страница 17: ...D Tx RET Rx FWD Tx RET FWD ATT dB 0 1 8 16 14 1 2 10 8 6 4 2 F O Receiver With Return Path Transmitter LASER APERTURE Invisible laser radiation Do not watch directly with optical instruments Class 1M...

Страница 18: ...18 Manual de instrucciones Transmisor Optico...

Страница 19: ...N DEX 1 Technical specifications 21 1 1 Optical transmitter direct path 21 1 2 Optical receiver return path 22 1 3 General 23 2 Link calculations 24 2 1 Direct path 24 2 2 Return path 30 3 Elements d...

Страница 20: ...ctor covers and cable caps in a safe place in case they are needed in the future Always fit the covers on the connectors of devices that are not connected to cables to prevent the laser beam from dama...

Страница 21: ...at the input of the optical transmitter must be at least 10 dB lower than channels in TV band RF input RF input connector F female Bandwidth 47 MHz a 2150 MHz Impedance 75 Ohm Return losses 12dB Max...

Страница 22: ...turn losses 12dB Maximum output level 2 tone IMD 45dBc Note 4 104 dB V tone Note 4 IMD Intermodulation distance For a higher number of channels the formula to obtain the decrease in the output level i...

Страница 23: ...power OK OFF Optical attenuation 15 dB LED transmitted power in direct channel ON Transmitted power OK OFF Transmitted optical power wrong Alarms Open contacts of rele free of potencial Alarm of lack...

Страница 24: ...atellite channel of 27 MHz in QPSK for optical losses 1 dB Note 7 69 dBm 40 dB V Minimum input level Vinmin for analogue TV channels C N 46 dB for optical losses 1 dB Note 8 75 dB V per channel Minimu...

Страница 25: ...of a three way optical splitter 5 8 dB Losses of a four way optical splitter 7 4 dB Losses per each optical connector 0 5 dB connector For example a link of 30 Km without optical splitters will have...

Страница 26: ...44 dBm Hz in 800 MHz for return losses of 5 dB 2 For optical losses between 8 dB and 13 dB both included EINn EINn minimum 5 dB 1 5 x optical losses 7 dB For instance for optical losses of 12 dB the e...

Страница 27: ...link Equivalent input noise analogue PAL TV 800 MHz Equivalent input noise digital QPSK TV 2 GHz 1 dB 16 dB 80 dBm 29 dB V 69 dBm 40 dB V 2 dB 14 dB 80 dBm 29 dB V 69 dBm 40 dB V 3 dB 12 dB 79 dBm 30...

Страница 28: ...o the link for analogue TV in TV band and digital TV in SAT band for different optical losses are shown in the following table Optical losses Minimum input level for analogue TV signals C N 46 dB Mini...

Страница 29: ...have Vin min Vin maximum 96 dB V optical losses must be 16 5 dB see Note 8 These losses are equivalent to either a 30 Km link with two optical connectors and no optical splitter or a 4 way optical spl...

Страница 30: ...for optical losses 5 dB Note 11 73 dB V per channel Note 10 Normalized equivalent input noise EINn It is the normalized input noise for 1 Hz The value 149 dBm Hz is only valid for optical losses equal...

Страница 31: ...Bm Hz 10 dB 2 x 10 dB 10 log 5 exp 6 72 dBm 37 dB V against 38 5 dB V for direct path see table in Note 7 The minimum input level for ths same signal with a requested C N of 46 dB will be 83 dB V agai...

Страница 32: ...r radiation Do not watch directly with optical instruments Class 1M laser product ALARM 10 5 9 5 7 2 5 9 5 6 3 4 7 8 10 1 1 2 1 RF input 47 2150 MHz Direct path 5 30 MHz Return path 2 Optical output D...

Страница 33: ...FWD Tx RET FWD ATT dB 0 1 8 16 14 1 2 10 8 6 4 2 F O Receiver With Return Path Transmitter LASER APERTURE Invisible laser radiation Do not watch directly with optical instruments Class 1M laser produ...

Страница 34: ...34 User manual Optical Transmitter...

Страница 35: ...arant a los da os provocados por uso indebido desgaste manipulaci n por terceros cat strofes o cualquier causa ajena al control de Telev s S A Guarantee Telev s S A offers a two year guarantee beginni...

Страница 36: ...34 344 Fax 971 48 834 644 EMail televes me televes com CHINA TELEVES CHINA Unit 207 208 Building A No 374 Wukang Rd Xuhui District 200031 Shanghai CHINA P R C Telephone 86 21 6126 7620 Fax 86 21 6466...

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