The term postmodernism has been applied both to the era following modernity, and to a host of movements within that era (mainly in art, music, and literature) that reacted against tendencies in modernism.
A CSU/DSU (Channel Service Unit/Data Service Unit) is a hardware device about the size of an external modem that converts a digital data frame from the communications technology used on a local area network (LAN) into a frame appropriate to a wide-area network (WAN) and vice versa.he Data Service Unit (DSU) manages line control, and converts input and output between RS-232C, RS-449, or V.xx frames from the LAN and the time-division multiplexed (TDM) DSX frames on the T-1 line. The DSU manages timing errors and signal regeneration.
DSL stands for Digital Subscriber Line. It's a way of combining traditional audio signals for the voice calls with digital communication for an Internet connection. The telecommunications company enables DSL on your line, and then it's your problem to get the higher frequency digital signals to your computers.here are two ways of filtering the phone signals in a DSL setting. The first is to install a DSL filter at each telephone. Each filter is just a little module with a very short cable; you plug the filter into the jack and then plug the phone into the filter.