Tööstuslik andmeside kontrolltöö 2 abimaterjal - vastused
start and stop bits are replaced with a new format that permits greater flexibility. A start type sequence, 1. Normal Disconnected Mode(NDM) for unbalanced mode Priority can be specified for all services.
called a header, prefixes each block of characters, and a stop type sequence, called a tail, suffixes each secondary not ready to receive any I or S frame This is always passed to the MAC layer to prioritise access
block of characters. Synchronous tranmission uses explicit bit synchronization: ·higher bit rates, more 2. Asynchronous Disconnected Mode(ADM) for unbalanced mode (if supported).
efficient · Data is transmitted in large contigous blocks of bits or characters. ·frame = unit of combined station not ready to receive any I or S frame 3. Initialization Mode(IM) For connection-oriented service, it also prioritises use of
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