Digital Enhanced radio communication (DECT), which originated in Europe, quickly conquered the entire telecommunications world. The benefits of this high-quality access technology are increasingly recognized by users, regulators, standardization bodies, network operators and equipment manufacturers. DECT's mobility and flexibility are proven to be suitable for network access in residential, commercial and public environments. Its voice quality is comparable to wired phones. Through advanced digital encryption technology, DECT offers high security, allows high density users, flexible bandwidth allocation, multi-service support, cost competitiveness, flexible deployment and easy installation.
DECT provides a common RF access technology for wireless communication, applicable in the frequency range of 1880-1900 MHZ, it uses GFSK modulation, BT=0.5.
DECT is designed to be accessible to support many types of communication networks, thus providing many different applications and services. It is suitable for residential, public switched telephone networks, integrated Services Digital Networks, wireless private automatic switches, global mobile communication systems, cordless local loops, wireless communication terminal modules, LAN access supports voice telephony, fax, E-mail, the Internet, modems, wireless wide area network protocols, and many other services that are cost-effective.
A DECT system includes a fixed segment (FP), one or more base stations (RFP), and one or more portable segments (PPS). There is no limit to the size of the device in terms of the number of base stations and wireless terminals. Devices using DECT technology can support traffic densities of up to 10,000 devices per square kilometer.
In principle, the DECT basic standard includes only fixed and mobile "air interfaces," which provide a toolbox of protocols and messages for selective access to any particular type of network. In addition to wireless, DECT provides users with specific network services and uses (including mobility) through a common "air interface."
Its multi-carrier (MC), time sharing multiple access (TDMA), time sharing duplex (TDD) wireless access methods, dynamic channel selection, high capacity allocation, multi-cell system can be used in busy and even harsh radio environment. These methods enable DECT to provide high quality services without the need for frequency orchestration. DECT enables the efficient use of allocated radio spectrum, enabling multiple operators and applications to share the same spectrum.
Standardisation bodies have defined such things as GAP(GAP protocol compliance, minimum requirement for all DECT voice devices since October 1997), ISDN and GIP (GSM Inter-Working Profile). Standards bodies encourage interoperability and coordination among DECT equipment manufacturers, which creates commonality and competition among different DECT equipment manufacturers and gives operators and consumers a choice among a wide variety of standard products. Standardized interoperability also allows mass production of system components, which in turn produces significant cost efficiencies, making DECT equipment extremely attractive and cost-effective
The North American personal wireless communication standards PWT and PWT/E (TIA) are also based on the DECT standard. PWT and PWT/E provide services like DECT. They use the same framework structure MAC, DLC, NWK and feature recognition, but another modulation scheme and frequency allocation. The PWT operates in the unlicensed band 1910-1920 MHZ. The PWT/E is extended to operate in the licensed bands 1850-1920mhz and 1930-1990mhz.
