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This unidirectional optical fibre or copper coaxial cable carrying data from the transmitting node to the receiving node is referred to as a link.

EVS-EN 50083-9:2002

The ASI specification allows for unlimited time displacement of data bytes. The example in Table C.

Both examples shown above highlight the fact that in an ASI design careful consideration needs to be given to the properties of the delay variation of the een.

The sync byte detector produces a time error between the detected and the hypothesized arrival times. Guidelines for the implementation and usage of ASI are laid down in informative annex F. Accept and continue Learn more about the cookies we use and how to change your settings.

Find Similar Items This product falls into the following categories. Subscription pricing is determined by: Search all products sn. Equipment which implements the parallel interface shall support the three transmission formats as shown in Figures 6, 7 and 8. In the case of fibre-optic application, the serial bit stream is passed through a driver circuit which drives an optical transmitter LED or LASER which is coupled to a fibre-optic cable through a connector.


This ASI specification applies only to the point-to-point type link. The link is used by the interconnected ports to perform communication. Data are read from this buffer at a constant rate determined by the transmission clock tx-clk. The frequency accuracy is shown by computing the mean Amean and standard deviation Asd of this inverse.

Switching between the code words depending on the RD in the transmitter and receiver maintains the DC balance.

EVS-EN – Estonian Centre for Standardisation

In some cases, an ASI output may work with an ASI input with a smaller buffer than is specified for the output, however ASI interoperability under these circumstances cannot be guaranteed. In order to recover byte alignment, a decoder searches 50038-9 the serial stream for the synchronization word which is necessary to achieve the serial to parallel conversion.

A detailed specification of the SSI is provided in annex A and guidelines for its implementation are provided in annex D. The first curve shows this rate converging to 10 kHz after about samples 0,07 s. Additionally, an ASI input should be designed with an receiver buffer that accommodates 5083-9 wide a variety of ASI outputs as possible within appropriate commercial constraints.

Receive data arriving on a coaxial cable are first coupled through a connector and coupling network to a circuit which recovers clock and data. RD is 05083-9 based on two subblocks: Independent of the validity of the transmission characters the received transmission characters shall be used as the receiver’s current RD for the next transmission character. Indicates the beginning of a Transport Packet by signalling the sync byte.

Describes physical interfaces for the interconnection of signal processing devices, such as in uplink stations. The system shall be designed to fulfil the high stability requirements of the modulator clocks, even when several links are cascaded.


In such a worst case scenario, the peak time slice transports all data and all other time slices carry no data. Otherwise the last RD is taken. Methods of measurements are given in ENchapter 3. Annexes designated “informative” are given for information only.

The following dates were fixed: The system can operate, subject to certain restrictions, with a variety of optical fibres; however, performance to this specification and interoperability between vendors equipment is assured only through the use of the optical fibre specified in this subclause. Once the clock and data are recovered, the bit stream is passed to a Biphase Mark decoder. RD at the end of fn sub-block is positive, if the sub-block contains more ones than zeros, or if the sub-block is or Maximum common mode 50803-9 It is required that bit synchronization shall occur in not more than 1 ms.

Another example uses a more well-behaved stream. Each line driver source has a balanced output and the corresponding line receiver destination a balanced input see Figure The number of bytes transferred in each time slice is shown in the left curve of Figure F.

NOTE In order to prevent possible synchronisation errors, it is recommended that consecutive bytes 47H do not 05083-9 within the byte or byte data packet.

Clock recovery In the receiver the clock recovery circuit extracts the transport clock directly from the encoded data stream.