A piece of equipment usually operated by a telephone company and controlled by an external computer that can cross-connect any TI line attached to the DACS to any other TI line, or any DSO channel or group of channels on a TI line to any DSO Time Slots of any other TI line.

Digital access and cross-connect system (DACS): In communications systems, a digital system in which (a) access is performed by T-1 hardware architecture in private and public networks with centralized switching and (b) cross-connection is performed by D3/D4 framing for switching digital-signal-0 (DS-0) channels to other DS-0 channels.