Motorola V186 User Manual - Page 99
may consist of a single word or may consist of a concatenated series of words packets, components
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Communications from the technical constraints and complexities of network operations thus allowing the intended application to be the item of focus. MDLC uses a semi-synchronous data format on two-way radio and an asynchronous format on wirelines. It is not correct to refer to message size in byte notation because of the 16-bit architecture; the data may not be sent in asynchronous format-no start and stop bits-but it is not true synchronous either because there is no single networkprovided clock signal. Instead, each CPU has a clock that is entirely adequate to provide the synchronize signal for data transfer. It is therefore better to refer to MDLC in terms of data words where each word may be variable in length, consist of both header and body components, and contain up to 80 16-bit variables within the body. A physical message may consist of a single word or may consist of a concatenated series of words (packets), each word addressed to one or more destination sites with some or all words requiring subsequent store-&-forward operation by the recipient site(s). The concatenated data words may be any combination of the supported functions, i.e. data upload to the SCADA Manager, error logger data to the STS/ToolBox, etc. 95