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DuplexDuplex communication is the transmission of voice and/or data signals that allows simultaneous 2-way communication.
Duplex Systems
This figure shows the different types of duplex systems. Frequency division duplex is a communications channel that allows the transmission of information in both directions (not necessarily at the same time) via separate bands (frequency division). Time division duplex (TDD) is a process of allowing two-way communications between two devices by time-sharing. When using TDD, one device transmits (device 1), while the other device listens (device 2) for a short period of time. After the transmission is complete, the devices reverse their roles, so device 1 becomes a receiver and device 2 becomes a transmitter. The process continually repeats itself so data appears to flow in both directions simultaneously. It is also possible to combine FDD and TDD.
GSM Books
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Introduction to GSM
This book explains the basic components, technologies used, and operation of GSM systems. This book starts with the system components and basic services that the GSM system can provide. You will learn that the key types of GSM devices include single mode and dual mode mobile telephones, wireless PCMCIA cards, embedded radio modules, and external radio modems. You will then discover the different types of available services such as multiple types of voice services, data services, group call, and messaging services. $19.99 Printed, $16.99 eBook |
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