IRT DDC-3471 Скачать руководство пользователя страница 11

3471-ddc.ib.rev2.doc 

page 11 of 20

 17/10/2007

 

Maintenance & storage 

 

Maintenance: 

 
No regular maintenance is required. 
 
Care however should be taken to ensure that all connectors are kept clean and free from contamination of any kind. 
This is especially important in fibre optic equipment where cleanliness of optical connections is critical to 
performance. 
 

Storage: 

If the equipment is not to be used for an extended period, it is recommended the whole unit be placed in a sealed 
plastic bag to prevent dust contamination. In areas of high humidity a suitably sized bag of silica gel should be 
included to deter corrosion. 
 
Where individual circuit cards are stored, they should be placed in antistatic bags. Proper antistatic procedures 
should be followed when inserting or removing cards from these bags. 
 

Warranty & Service

 

 
Equipment is covered by a limited warranty period of three years from date of first delivery unless contrary 
conditions apply under a particular contract of supply. For situations when “

No Fault Found

” for repairs, a 

minimum charge of 1 hour’s labour, at IRT’s current labour charge rate, will apply, whether the equipment is within 
the warranty period or not. 
 
Equipment warranty is limited to faults attributable to defects in original design or manufacture. Warranty on 
components shall be extended by IRT only to the extent obtainable from the component supplier. 

 
Equipment return: 

Before arranging service, ensure that the fault is in the unit to be serviced and not in associated equipment. If 
possible, confirm this by substitution. 
 
Before returning equipment contact should be made with IRT or your local agent to determine whether the 
equipment can be serviced in the field or should be returned for repair. 
 
The equipment should be properly packed for return observing antistatic procedures. 
 
The following information should accompany the unit to be returned: 
 

1.  A fault report should be included indicating the nature of the fault 
2.  The operating conditions under which the fault initially occurred. 
3.  Any additional information, which may be of assistance in fault location and remedy. 
4.  A contact name and telephone and fax numbers. 
5.  Details of payment method for items not covered by warranty. 
6.  Full return address. 
7.  For situations when “

No Fault Found

” for repairs, a minimum charge of 1 hour’s labour will apply, 

whether the equipment is within the warranty period or not. Contact IRT for current hourly rate. 

 
Please note that all freight charges are the responsibility of the customer. 
 
The equipment should be returned 

to the agent who originally supplied the equipment

 or, where this is not 

possible, to IRT direct as follows. 

Equipment Service 
IRT Electronics Pty Ltd 
26 Hotham Parade 
ARTARMON 
N.S.W. 2064 
AUSTRALIA 
 
Phone: 

61 2 9439 3744 

Fax:  61 2 9439 7439 

Email: [email protected] 

IRT 

Communications 

www.irtcommunications.com

Содержание DDC-3471

Страница 1: ...nd on the Internet at http www irtelectronics com I R T Electronics Pty Ltd A B N 35 000 832 575 26 Hotham Parade ARTARMON N S W 2064 AUSTRALIA National Phone 02 9439 3744 Fax 02 9439 7439 Internation...

Страница 2: ...tallation in frame or chassis 8 Connections 9 Front rear panel connector diagrams 9 Operation 10 Front indicators 10 Processing controls 10 Maintenance storage 11 Warranty service 11 Equipment return...

Страница 3: ...ts lower processing speed requirements The ASI O interface is of limited usefulness due to the specification of multimode fibre with only a short haul capability Optical transport of ASI can be better...

Страница 4: ...randomisation Scrambling The Sync 1 Byte is inverted according to the MPEG 2 framing structure and the data stream randomised for spectrum shaping purposes Reed Solomon RS encoder A shortened Reed Sol...

Страница 5: ...Temperature range 0 50 C ambient Mechanical Mounts in IRT FRU 1030 1 RU 19 rack chassis with input output and power connections on the rear panel Finish Front panel Grey enamel silk screened black let...

Страница 6: ...ith the interleaver and RS encoder enabled SPI Output The SPI output uses differential LVDS signalling with a standard 25 pin D female connector The output is disabled when Input Loss Alarm is trigger...

Страница 7: ...MPEG TS will be disturbed The time taken before normal decoding resumes is dependent on the decoder in use and may be up to five seconds LK 1 OUT Standard Operation IN Sets transport stream indicator...

Страница 8: ...utions should be observed Where individual circuit cards are stored they should be placed in antistatic bags Proper antistatic procedures should be followed when inserting or removing cards from these...

Страница 9: ...ata 3 B 8 Data 2 A 21 Data 2 B 9 Data l A 22 Data 1 B 10 Data 0 A 23 Data 0 B 11 DVALID A 24 DVALID B 12 PSYNC A 25 PSYNC B 13 Cable Shield Alarm connections J 1 Alarm relay output Front rear panel co...

Страница 10: ...different MPEG TS formats In this context the word scrambling refers to the process of Sync1 inversion and randomisation for the purpose of energy dispersal of the signal It does not refer to the enc...

Страница 11: ...inable from the component supplier Equipment return Before arranging service ensure that the fault is in the unit to be serviced and not in associated equipment If possible confirm this by substitutio...

Страница 12: ...ta transfer is synchronised to the Byte clock of the MPEG transport stream The data to be transmitted are MPEG 2 transport packets The data signals are synchronised to the clock depending on the trans...

Страница 13: ...rial data stream The disparity characteristics of the code maintain DC balance Special characters are defined as extra code points beyond the need to encode a Byte of data One in particular is used to...

Страница 14: ...e PRBS registers is initiated at the start of every eight transport packets To provide an initialisation signal for the de scrambler the MPEG 2 sync Byte of the first transport packet in a group of ei...

Страница 15: ...Byte stream by the input switch Each branch is a First In First Out FIFO shift register with depth Mj cells where M 17 N I N 204 error protected frame length I 12 interleaving depth branch index The c...

Страница 16: ...dB Electrical characteristics CCITT G 703 34368 Kb s Cable type Coaxial Impedance 75 Signal level 1 0 V Nominal pulse width 14 55 ns Code conversion HDB3 Pulse shape Fig 17 G 703 Jitter at input port...

Страница 17: ...simplifying system design Note that the ASI signal is polarity sensitive Although most 270 Mb s SDI DA s and switchers will pass ASI signals the line drivers used usually have both inverted and non i...

Страница 18: ...11 12 GHz satellite services ETS 300 429 Digital broadcasting systems for Television sound and data services framing structure channel coding and modulation for cable systems ETS 300 473 Digital broad...

Страница 19: ...U CCITT recommendation G 703 HDB3 High Density Bi polar of order 3 IF Intermediate Frequency IRD Integrated Receiver Decoder ITU International Telecommunications Union LSB Least Significant Bit LVDS L...

Страница 20: ...10 2007 Drawing index Drawing Sheet Description 804489 1 DDC 3471 circuit schematic 804489 2 DDC 3471 circuit schematic 804489 3 DDC 3471 circuit schematic I R T C o m m u n i c a t i o n s w w w i r...

Страница 21: ...SPI_OUT1 SPI_OUT2 SPI_OUT3 SPI_OUT4 SPI_OUT5 SPI_OUT6 SPI_OUT7 SPI_ENA SPI_CLK PCLK_IN SPI_IN0 SPI_IN1 SPI_IN2 SPI_IN3 SPI_IN4 SPI_IN5 SPI_IN6 SPI_IN7 RELSW RELCOM ASIOUT PS1 PS3 PS2 PS4 INENA SPI IN...

Страница 22: ...22B 23A 23B 24A 24B 25A 25B 26A 26B 27A 27B 28A 28B 29A 29B 30A 30B 31A 31B 32A 32B M1 M2 PL2 DIN64M VCC GND VCC GND VCC GND SPI_ENA SPI_ENA SPI_ENA SPI_OUT1 SPI_OUT0 SPI_OUT3 SPI_OUT2 SPI_OUT4 SPI_O...

Страница 23: ...OUT0 DVAL_OUT DVAL_OUT PSYNC_OUT PSYNC_OUT SPI_OUT5 SPI_OUT5 SPI_OUT4 SPI_OUT4 SPI_OUT2 SPI_OUT2 SPI_OUT3 SPI_OUT3 SPI_CLK SPI_CLK SPI_OUT6 SPI_OUT6 SPI_OUT7 SPI_OUT7 SPI_IN1 SPI_IN1 SPI_IN0 SPI_IN0 S...

Отзывы: