A cordless telephone is a home or business telephone with a wireless handset that communicates, via RF transmission, with a base station connected to a fixed PSTN telephone line. The base station is located at the subscriber's premises, and is attached to the telephone network in the same way as a corded telephone. The cordless telephone maintains an effective range that enables full mobility at the subscriber’s premises and within close proximity outdoors.
Connected to the PSTN line, the cordless phone's base can be quite simple, providing just a line connection and handset cradle for charging. Alternatively, the base can serve multiple handsets and incorporate advanced functionality such as answering machine, caller ID, speakerphone, and other capabilities.
PSTN cordless phone handsets are available either without a display or with a simple black-and-white or full-color LCD display. At the same time, they can include speakerphone, melody ringer, caller ID, phone book management, SMS and other functionalities. Cordless handsets can offer standard narrowband audio, wide band synthesis or wide band audio (i.e. high-definition voice) for improved voice quality.
Digital cordless RF bands and protocol standards used today include:
- 1.7GHz -1.9GHz DECT (Digital Enhanced Cordless Technologies) – used in Europe, US (DECT6.0), Korea, Latin America and elsewhere
- 2.4GHz – used in Japan, China and the US; the dominant protocols for this RF band is DSP Group®’s proprietary EDCT (Enhanced Digital Cordless Technology) and WDCT (Wireless Digital Cordless Technology) protocols
- 5.8GHz – used in the US, with DSP Group’s proprietary EDCT cordless protocol
Over the last few years, the DECT Forum and ETSI have defined and promoted CAT-iq (Cordless Advanced Technology – Internet and Quality) as the next-generation DECT technology. CAT-iq enables high-quality audio, diverse interoperability features between multi-vendor bases and handsets, and advanced data applications.
DSP Group is the world-leading provider of chipsets for cordless telephony. DSP Group's chipsets support all current RF bands and digital cordless protocols such as DECT (1.7GHz-1.9GHz) and EDCT/WDCT for 2.4GHz and 5.8GHz.
Complementing the Company's system-on-a-chip (SoC) design, DSP Group provides an array of leading cordless voice and data transmission solutions. DSP Group also offers advanced cordless technologies such as direct sequence and frequency hopping spread spectrum (FHSS), as well as RF chips for DECT 1.7GHz-1.8GHz, 2.4GHz and 5.8GHz ISM bands. By always remaining at the cutting edge of technology, DSP Group ensures its leadership position in the highly competitive cordless communications market.
As the world leader in chipset solutions for cordless telephony, DSP Group's offering is ideal for all types of cordless phones. The Company's hardware and software reference designs enable customers to develop cordless telephony products at a lower effort and faster time to market than alternative silicon solutions.