sentences:  They competed with now-gone companies such as Cabletron Systems, SynOptics, Ungermann-Bass, David Systems, Digital Equipment Corporation, and American Photonics, all of which were early entrants in the "LAN Hub" industry.Chipcom also was involved in Token Ring, FDDI, and Asynchronous Transfer Mode (ATM).Some of Chipcom's innovations at the time are well-documented in the trade press of the era, such as Computerworld.