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DECT

The DECT standard is used today in digital cordless telephones in Europe and around the world.

It has been defined by ETSI (European Telecommunications Standards Institute) and ITU has adopted it as a member of the IMT-2000 family (called IMT-FT in IMT-2000). It operates on the 1880-1900MHz frequency band.

It is also widely used in America in the form of DECT 6.0 (in USA, Canada and Brazil). DECT 6.0 uses the same general structure and techniques with MAC layer different approaches. The operating frequency band in this case is 1920-1930MHz.

DECT bands are reserved for exclusive use by DECT devices. That is a key asset of the technology that enables it to provide reliable and robust cordless communications because potential interferer behavior is well understood – as it uses the same standard.

Why would I use DECT in a new project?

If you need a reliable voice or audio cordless product this is most probably the right technology for it as it uses reserved bands therefore reducing the chances of interference from devices working in accordance with a different standard (as is the case in the 2,4GHz band).

Is DECT safe enough for my application?

DECT includes authentication and cyphering mechanisms that make it a safe approach for wireless communications as compared with any analogue option. The security options include the standard cyphering algorithm or alternative proprietary solutions for additional security.

Is DECT good enough for a professional business application? Can it carry voice and control data?

It is for sure. The same technology is used both for residential and business applications. Although it is most well known for its presence in the residential cordless telephony market, it is also well present in professional equipments for businesses use.

It can be used for a number of other applications that can take advantage of a clear cordless audio path combined with data exchange capabilities.

I will want to have it my product sold worldwide. Will DECT restrict me?

DECT is used in many parts of the world including all European countries, most of the American continent, Japan, Australia, and a significant part of Asia. A good reference for its use worldwide is the DECT worldmap by the DECT Forum.

What is the typical range of a DECT equipment?

The link budget of a DECT equipment is typically~116dB. This typically provides a range of~250m (~820 feet) in line of sight conditions and ~30m (~98 feet) indoors (note: this indoor range is highly dependent on the number of walls, wall thicknesses, metal furniture, construction materials, etc.

What is the standard topology and medium access mechanism used by DECT?

DECT uses a star topology as depicted in the image below. The central-element of a system is designated as Fixed Part (FP) – this is typically the base station in a residential DECT system. The handsets, headsets or other form of device that communicates using DECT with the Fixed Part are designated as Portable Parts (PP).

A multi-carrier TDMA/TDD structure is used allowing a number of simultaneous communications to the same base to take place. Up-to 120 simultaneous ongoing communications are theoretically possible at the same location.

What communication services are possible with DECT?

  • Voice
    This is the most well-known service, used on residential and business telephone systems

  • Wideband audio (8KHz)
    Wideband audio was introduced with CAT-iq 1.0. It provides enhanced audio quality to communications over DECT. One can, however, only feel the improved quality if there is no other botleneck in the system using it. It is particularly suited for systems with VoIP interfaces as the end-to-end audio quality can be better than that of the POTS (Plain Old Telephone System).

  • Ultrawideband audio (16KHz)
    This service is based on the transfer of audio coded with the CELT codec. Bithium will be offering problem solving solutions supported on this type of DECT service.

  • Data
    Data services include low-data-rate data (2kbit/s), as well as protected (24kbit/s) or unprotected synchronous (32kbit/s). Multiples of these two last data-rates are also possible using multiple slots.

Are there specific profiles for different applications?

DECT has a number of specified application profiles.

GAP (Generic Access Profile)
It is used on most of the DECT residential telephone systems available in the market today. It provides interoperability with devices (PPs and FPs) in the voice communications telephony field area from different manufacturers.

Bithium works with different application profiles. It may also build custom profiles to fit customer specific application and interoperability requirements. Please consult us for specific questions you may have on this.

DPRS (DECT Profile for data communication applications)
It can be combined with GAP thereby supporting data and voice (DMAP is the profile that covers both these services).

For more information on the DECT standard capabilities, profiles we can provide and profiles please contact us.

CATiq (Cordless Advanced Technology – internet and quality)
is based on the DECT standard and provides a standardized way in interfacing VoIP and internet connectivity to DECT cordless terminals. It also brings wideband audio and advanced service capabilities. ETSI and the DECT Forum and its members are responsible for CAT-iq standardization and interoperability.

How can Bithium help me develop a DECT product?

We can provide a turnkey solution from concept to ready product or help on any of the steps in between. The product can range from a residential telephone system, to a multi-cell system with interconnectivity through an IP network. It really depends on what is the best way to interact with your company team. We have our own field proven DECT protocol stack which we use to design challenging and innovative projects in the DECT field.

Why should I chose Bithium for my next design?

Bithium is an experienced, European based company with a track record of successful designs that we assisted in bringing to the market. We take pride on the innovation and success we help bring to our customers by developing innovative reliable products. We have a extensive accumulated experience in DECT and a spirit ready to new challenges.

Why are you using your own protocol stack?

Bithium uses its own in-house developed, market proven DECT protocol stack.

The stack has different add on capabilities. Furthermore it may be tailored to suit particular requirements therefore bringing a great flexibility for product development and optimization.

Do you have a DECT design for licensing?

Yes., the Seraphone design is available for licensing by interested parties. Its industrial design focuses on comfort and familiarity with a classical telephone. Its classical “not rectangular†shape assists the user in the grip and feel.

Volume production can also be provided on demand. For further information please contact us.

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