from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. of a communications system in which the source and target are each synchronized but each transmission contains a start bit and a stop bit
Sorry, no etymologies found.
It was initially started to commercialize a technology called isosynchronous Ethernet, which carries voice calls using a special signaling method much the same way ISDN-based phone systems operated.
The technical details aren't so important now, as isosynchronous Ethernet is obsolete, but the idea of interleaving voice and data on a common wire was, for it led to the development of the first commercially useful VoIP product, the Internet PhoneJACK.
That said, I'm not sure how isosynchronous ethernet, which was a Layer 2 effort requiring proprietary switches and transceivers and which obscured the value of Ethernet (generic common-class hardware and software) has anything to do with VoIP, which is a Layer 5+ effort implemented in software and preserving the value of Ethernet.