| DECT wireless telephony arrives in the US |
Oct. 13, 2005
Cordless phones in the US are about to get a major boost from DECT technology, just approved by the Federal Communications Commission (FCC). The FCC has granted DECT-based wireless telephony permission to operate in the 1920-1930 MHz band, as part of a "general reorganization of frequency bands in the US," the DECT Forum said.
DECT ("Digital Enhanced Cordless Telecommunications") wireless technology is suitable for voice, multimedia, and data networking traffic, including Internet access, and integrates well with other fixed and wireless services such as ISDN and GSM, according to the DECT Forum. DECT also boasts a claimed range of up to a few hundred meters, encryption to ensure a high degree of call security, and "optimized" radio transmission that maximizes handheld device battery life.
(Source: DECT Forum)
DECT wireless technology targets homes, businesses, industry, and public areas
Benefits of DECT technology, according to the Forum, include "brilliant quality of voice and sound, high protection against wiretapping, simultaneous usage of multiple cordless phones, which can be operated in basic stations of different vendors (GAP standard), toll free internal calls, handover, and various additional features such as VoIP, push-to-talk (walkie-talkie), and instant messaging."
Capabilities of DECT are said to include: - TDMA (Time Division Multiple Access) radio access -- low interference and high system capacity
- ADPCM (Adaptive Differential Pulse Code Modulation) speech encoding -- ensures very high speech quality, comparable to wireline telephony
- DCS/DCA (Dynamic Channel Selection / Allocation) -- a unique DECT capability that guarantees that the best radio channels available are used; ensures that DECT telephony can coexist with other DECT applications, and with other systems in the same frequency, with high-quality, robust and secure communications for end-users
Comparison of wireless technologies
The following table indicates how DECT compares with other commonly used wireless technologies:
| Feature | Home RF | 802.11a | 802.11b | Bluetooth | DECT | IrDA | | Technology | Radio | Radio | Radio | Radio | Radio | Optical | | Frequency | 2.4 GHz | 5 GHz | 2.4 GHz | 2.4 GHz | 1.9 GHz | 850 nm | | Basic data rate bits/sec | 0.8/1.6 M | 54 M | 11 M | 1 M | 552 K | 4 M/115 K | | Range, meters | 50 | 150 | 30 | 10 | 300 | 3 | | Max terminals | 128 | 128+ | 128 | 8 | 12 | 10 |
Comparison of wireless technologies
(Source: www.tiresias.org)
 First US DECT-powered cordless phone debuts
Earlier this week, Linksys announced a DECT-based cordless VoIP handset using a PC running Skype. According to Linksys, the CIT200 allows users to make VoIP phone calls as easily as today's cordless handsets make conventional landline calls. The Linksys DECT-based cordless VoIP phone claims a range of 300 meters outdoors, and 50 meters indoors.
The DECT Forum, based in a Berne, Switzerland, is a global industry association of suppliers and operators of DECT based terminals, systems, and networks. "Full members" of the organization currently include Ascom Tateco, Binatone, DSP Group, Eatoni, Ericsson, Infineon, Kirk, Panasonic, RTX, Siemens, SunCorp, and Tenovis.
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