Modem sharing device
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A modem sharing device,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> also called a line sharing device, modem sharer or line sharer, allows multiple Binary Synchronous Communications devices to share a serial connection. Synchronous and asynchronous datastreams are supported. A common example was a Tandem host connected to automatic teller machines, with a modem or router in between.