Industrial communication networks. Fieldbus specifications - Data-link layer protocol specification. Type 19 elements1 Scope 1. 1 General The data link layer provides basic time critical messaging communications between devices in an automation environment. This protocol provides communication opportunities to all participating data link entities a) in a synchronously starting cyclic manner, according to a pre established schedule, and b) in a cyclic or acyclic asynchronous manner, as requested each cycle by each of those data link entities. Thus this protocol can

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BS EN 60862-2 gives practical guidance on the use of SAW filters which are used in telecommunications

BS EN IEC 61000 is a series on Electromagnetic compatibility (EMC)