a mode of data transmission in which data is transmitted in blocks of characters. Sync characters are transmitted prior to actual data transmission to establish timing. Commonly used for batch transmission., pertaining to two or more processes that depend upon the occurrence of specific events such as common timing signals, omane kahele või enamale protsessile, mis sõltuvad teatavate sündmuste toimumisest, näiteks ühistest ajastussignaalidest