Digital Loop Carrier is a system that uses existing cabling for delivery to transmit wireless multiplexed data signals. In the central office, the digital loop carrier starts transmission on a high-speed digital line, such as T1, and routes the transmission to a remote digital terminal, which then transforms the signal into a type that can be transmitted to low-speed telephone or machine lines for routing to end-users. When transmissions are received from the end user, the mechanism is reversed, where the system gathers transmissions and multiplexes them so that they can be sent to the central office of the local loop in the aggregate. In remote areas from telephone central offices, DLC systems provide narrowband networks, usually in locations where it costs less than expanding or improving copper-feeder facilities. Some systems also support wideband and broadband networks, especially next-generation DLCs (NGDLCs).