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DECT or Digital Enhanced (former European) Cordless Telecommunications is an ETSI standard for portable phones, commonly used for domestic or corporate use. DECT can also be used for wireless data transfers.

DECT is (like GSM) a cellular system. Comparing DECT against GSM shows one major difference: the cell radius (25..100 meters for DECT, 2..10 km with GSM).

British Telecom DECT cordless telephone (base unit and handset are shown)

Here are some another DECT properties:

DECT physical layer use: This means that the radio spectrum is divided into physical channels into two dimensions: frequency and time.

DECT media access control layer is the layer which controls the physical layer and provides connection oriented, connectionless and broadcast services to the higher layers. It also provides encryption services.

DECT data link layer uses a variant of the ISDN data link protocol called LAPC. They are based on HDLC.

DECT network layer contains various protocol entities:

All these communicate through a Link Control Entity (LCE).

The call control protocol is derived from ISDN DSS1, which is a Q.931 derived protocol. Many DECT specific changes have been made.

Three application areas:

DECT GAP is an interoperability profile for DECT. The intent is that two different products from different manufacturers that both conform not only to the DECT standard, but also to the GAP profile defined within the DECT standard, should interoperate for basic call functionality.