 UMTS TDD. TD-CDMA mobile devices consume significantly less power than other devices, resulting in improved talk times and standby times. Glossary TDD (Time Division Duplex) TDD (Time Division Duplex) A half-duplex technique in which each end of the conversa- tion makes use of the same frequency. TDM (Time Division Multiplexing) A means of obtaining a number of channels over a single path by dividing the path into a number of time slots and assigning each channel its own intermittently repeated time slot. At the receiving end, each time-separated channel is reassembled. TDMA (Time Division Multiple Access) A multiple-access technique that first divides the available or allocated frequency spectrum into a number of channels. Then, within each channel, TDM is applied to carry multiple users interleaved in time. TD-SCDMA (Time Division Synchronous Code Division Multiple Access) 3G mobile telecommunications standard used primarily in China. It is based on spread spectrum CDMA technology. telco A telephone company. telecommunication lines Telephone and other communication pathways used to transmit information from one location to another. telecommunications Any process that permits the passage of information from a sender to one or more receivers in any usable form (e.g., printed copy, fixed or moving pictures, visible or audible signals) by means of any electromagnetic system (e.g., electrical transmission by wire, radio, optical transmission, waveguides). teledensity The number of main telephone lines per 100 inhabitants. teleimmersion A technology that combines virtual reality and videoconferencing in order to enable people who are geographically separated from one another to collaborate in real-time in a shared, simulated environment, with access to the same media, computer applications, images, audio, and simulation. telephone channel A transmission path designed for the transmission of human speech or other telephone communication (e.g., fax) requiring the same bandwidth. The bandwidth of an analog telephone ch