ABSTRACT
The two primary forms of multiplexing currently used across both voice and data networks are frequency-division multiplexing and time-division multiplexing (TDM). The synchronization of the TDM signal is critical to the delivery of information. Each time slot requires special framing and coordination bits that tell the receiving end where each information slot starts and stops. The channel service unit, or the digital service unit, is a device used to interface between transmitting equipment and the external circuit in the wide area network that carries the information. Direct-sequence spread spectrum is a method used in both 802.11 wireless local area network processes and code-division multiple-access transmissions associated with mobile wireless networks. The term data is used in a broad sense because all voice conversations through core networks as well as traditional data transmissions are represented by the same type of symbol format: 1s and 0s.
