Most popular traditional TDM bandwidth sharing, rather than the standard digital signal using FDM, are popular. 1) Digital Signal Hierarchy DSH 2) ITU' s Digital Signal Hierarchy 3) SONET' s Optical Carrier System 4) SONET' s Synchronous Transport Signal System 1.2 the modem and telephony modem (Modem and Telephone System) function to convert the digital signal into an analogue signal (Digital) (Analog) or audio, and then send a signal through to the phone system, we can talk to each other over the phone, and then heard the sound of the receiving side will have a modem that converts the analog signal. To a digital signal so that the same information is processed. Its digital signal is 0, the computer knows to 1. Best known as an analogue signal, telephone system, it sounds only. The main difference of the Lan to the Wan is the length between the computer on the network to send data on a phone line that it submitted would be beyond the use of UTP Lan that are used in the system.
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