DIN EN Cable networks for television signals, sound signals and interactive services – Part 9: Interfaces for CATV/SMATV headends. Buy CEI EN CABLE NETWORKS FOR TELEVISION SIGNALS, SOUND SIGNALS AND INTERACTIVE SERVICES – PART 9: INTERFACES FOR . BS EN Cable networks for television signals, sound signals and interactive services – Interfaces for CATV/SMATV headends and similar.
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The packet synchronization byte 47H or B8H is used as a byte alignment pattern which serves for initializing the serial to parallel conversion.
EVS-EN – Estonian Centre for Standardisation
NOTE 4 For the purpose of these masks, the rise time and delay time dn be measured between -0,04 V and 0,4 V, and should not exceed 4 ns. This displacement can occur for a variety of reasons, e.
The aperiodicity of some ASI output streams and the receiver buffer size they require for proper reception is illustrated in the following diagrams. This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3. This note is intended to explain some of the causes of problems and to offer guidelines to ASI implementers that will encourage maximum interoperability.
BS EN 50083-9:2002
To achieve this, the receiver clock frequency needs to be equal to or greater than the transmission clock frequency. Search all products by. The attenuation of the f law. The packet length can be bytes or bytes.
Kabelnetze fuer Fernsehsignale, Tonsignale und interaktive Dienste. Click to learn more. The link is used by the interconnected ports to perform communication. Interfaces pour les tetes de resaux pour antennes communautaires, antennes collectives par satellite et materiels professionnels a. The contents of the 16 bytes in this extra packet length are not specified in this standard. The threads are of type UNC . The synchronous serial interface SSI which can be seen as an extension of the parallel interface, is briefly introduced in subclause 4.
Recovered serial data bits are passed to a decoder which converts the bit transmission words back into the 8-bit bytes originally transmitted. Please download Chrome or Firefox or view our browser tips. The main functions are: This subclause provides specifications for SSI physical layer Layer NOTE 4 For the purpose of these masks, the rise time and delay time should be measured between —0,4 V and 0,4 V, and should not exceed 4 ns. It consists of two adapter modules: The variable ACCTn is the accumulator in the loop filter, and it converges to the time interval between arriving sync bytes.
The data rate is much more constant, and the required receiver buffer also is much lower. This can be accomplished by several techniques [such as a triggering the oscilloscope on the measured waveform or b providing both the oscilloscope and the pulse output circuits with the same clock signal]. The clock corresponds directly to the user data rate. As the voice of the U.
een When using an oscilloscope technique to determine pulse compliance with the mask, it is important that successive traces of the pulses overlay in order to suppress the effects of low frequency jitter. All kinds of networks like: To improve interoperability, ASI implementations need to be subject to certain restrictions on the data transmission.
The first curve shows this rate converging to 10 kHz after about samples 0,07 s. In order to establish whether such inputs and outputs will interface to each other correctly, it is necessary to understand precisely the distribution of transport packet bytes and ASI stuffing bytes, and the detailed operation of the equipment. Subscription pricing is determined by: Learn more about the cookies we use and how to change your settings.
In addition references are made to all other parts of EN series Cable networks for dn signals, sound signals and interactive services and in particular for RF, video and audio interfaces to part 5: Indicates the beginning of a Transport Packet by signalling the sync byte.
Both the buffer underflow and the relatively large buffer size should be avoided fn practical situations. The faster, easier way to work with standards. RD determines the ratio of zeros and ones during the transmission. The SSI is functionally equivalent to the parallel interface since the Transport Packets can be transmitted either contiguously or separated by 16 bytes reserved for dummy bytes or extra bytes.
NOTE 3 Each pulse in a coded pulse sequence should meet the limits of the relevant mask, irrespective of the state of the preceding or succeeding pulses, with both pulse masks fixed in the same relation to a common timing reference, i. Transport 500883-9 can be transmitted as a block of contiguous bytes that is, with no intervening sync bytes in the transmitted stream ej a single packet or as individual bytes with intervening sync bytes, or any combination of contiguous bytes and sync bytes.
Logic convention The terminal A of the line driver is positive with respect to the terminal B for a binary 1 and negative 5008-9 a binary 0 see Figure The synchronous parallel interface is specified to cover short or medium distances, i. Document Status Indicators The Green document status indicator indicates that the document is: