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CDPD
Cellular Digital Packet Data (CDPD) was a wide-area mobile data service which used unused bandwidth normally used by Advanced Mobile Phone System (AMPS) mobile phones between 800 and 900 MHz to transfer data. Speeds up to 19.2 kbit/s were possible, though real world speeds seldom reached higher than 9.6 kbit/s. The service was discontinued in conjunction with the retirement of the parent AMPS service; it has been functionally replaced by faster services such as 1xRTT, Evolution-Data Optimized, and UMTS/ High Speed Packet Access (HSPA). Developed in the early 1990s, CDPD was large on the horizon as a future technology. However, it had difficulty competing against existing slower but less expensive Mobitex and DataTAC systems, and never quite gained widespread acceptance before newer, faster standards such as General Packet Radio Service (GPRS) became dominant. CDPD had very limited consumer products. AT&T Wireless first sold the technology in the United States under the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digital Ocean
Digital Ocean, Inc., was a maker of wireless products from 1992 to 1998. The company was founded in May 1992 by Jeffery Alholm and headquartered in Lenexa, Kansas. Several contracts with Apple Inc., AT&T, Aironet Wireless Communications (later acquired by Cisco as its wireless LAN division), Harris Semiconductor, the United States Department of Defense, and several others made Digital Ocean the leader in developing and manufacturing state-of-the-art wireless products for the entire line of Apple's desktop, portable, and pen-based devices. It was a co-developer of the IEEE 802.11 wireless standard and of the industry's first 802.11 chipset. It developed the Seahorse, arguably the world's first smartphone. In addition, by specializing in rapid, custom development, the company concluded multiple individual development contracts for application specific wireless products in vertical markets. Digital Ocean was granted approximately 20 patents for its development of wireless technologie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GPRS
General Packet Radio Service (GPRS) is a packet oriented mobile data standard on the 2G and 3G cellular communication network's global system for mobile communications (GSM). GPRS was established by European Telecommunications Standards Institute (ETSI) in response to the earlier CDPD and i-mode packet-switched cellular technologies. It is now maintained by the 3rd Generation Partnership Project (3GPP). GPRS is typically sold according to the total volume of data transferred during the billing cycle, in contrast with circuit switched data, which is usually billed per minute of connection time, or sometimes by one-third minute increments. Usage above the GPRS bundled data cap may be charged per MB of data, speed limited, or disallowed. GPRS is a best-effort service, implying variable throughput and latency that depend on the number of other users sharing the service concurrently, as opposed to circuit switching, where a certain quality of service (QoS) is guaranteed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AT&T Wireless
AT&T Mobility LLC, also known as AT&T Wireless and Trade name, marketed as simply AT&T, is an American telecommunications company. It is a wholly owned subsidiary of AT&T, AT&T Inc. and provides wireless services in the United States. AT&T Mobility is the List of United States wireless communications service providers, third-largest wireless carrier in the United States, with 101.6 million subscribers as of the end of Q1 2022. The company is headquartered in Brookhaven, Georgia. Originally known as Cingular Wireless (a joint venture between SBC Communications and BellSouth) from 2000 to 2007, the company acquired the old AT&T Wireless Services, AT&T Wireless in 2004; SBC later acquired AT&T Corporation, the original AT&T and adopted its name. Cingular became wholly owned by AT&T in December 2006 as a result of AT&T's Mergers and acquisitions, acquisition of BellSouth. In January 2007, Cingular confirmed it would rebrand itself under the AT&T name. Although the legal corporate n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telemetry
Telemetry is the in situ collection of measurements or other data at remote points and their automatic transmission to receiving equipment (telecommunication) for monitoring. The word is derived from the Greek roots ''tele'', "remote", and ''metron'', "measure". Systems that need external instructions and data to operate require the counterpart of telemetry, telecommand. Although the term commonly refers to wireless data transfer mechanisms (e.g., using radio, ultrasonic, or infrared systems), it also encompasses data transferred over other media such as a telephone or computer network, optical link or other wired communications like power line carriers. Many modern telemetry systems take advantage of the low cost and ubiquity of GSM networks by using SMS to receive and transmit telemetry data. A ''telemeter'' is a physical device used in telemetry. It consists of a sensor, a transmission path, and a display, recording, or control device. Electronic devices are widely ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EarthLink Wireless
EarthLink is an American Internet service provider. It went public on NASDAQ in January 1997. Much of the company's growth was via acquisition; by 2000, ''The New York Times'' described Earthlink as the "second largest Internet service provider after America Online." Business EarthLink was formed in 1994, and offers services to residential consumers and businesses. EarthLink claims to have five million users. EarthLink business internet sells business telecom services, IT and virtualization, cloud computing, IT security, digital marketing, colocation, hosted applications and support services. The company owns and operates a U.S. network including 29,421 route miles of fiber, 90 metro fiber rings, and eight data centers. EarthLink's offers residential consumers services that include wireless, fiber, and satellite internet, streaming content bundles, web hosting and e-commerce. Its products include spam filters, anti-virus protection, and cloud storage. Private equity firm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palm V
Palm V is a personal digital assistant (PDA) by 3Com. Released in 1999 by 3Com, the PDA has an aluminum enclosure containing a Dragonball EZ central processing unit (capable of overclocking to 39 MHz) and 2MB of memory. The 16-shade grayscale display has a backlight and increased resolution from the previous-generation Palm III. Unlike that older device, which uses disposable batteries ( AAAs), the Palm V has a built-in rechargeable lithium-ion battery with an expected charge lasting 1–2 weeks. Palm Vs are equipped with a serial port that is electrically though not physically compatible with the EIA-232-D telecommunications standard (the new enclosure design prevents Palm III-compatible accessories from connecting to the port) and a Consumer IR transceiver. Upon launch, the Palm V cost about , though it had reduced to –400 by January 2000 (equivalent to about $– in ). Units sold in late 1999 came pre-loaded with Palm OS version 3.0, though 3.3 was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OmniSky
OmniSky was a dotcom-era Silicon Valley startup, focused on web-enabled, wireless, mobile touchscreen products and services. Built around the Palm V, OmniSky produced the first touchscreen handset to integrate Google's search engine. OmniSky was founded on May 7, 1999 and held an IPO through NASDAQ on September 21, 2000. It generated no revenue in 1999 and prior to its IPO it reported a lifetime total of $2.1 million revenue compared to a loss of more than $40 million. By November 2001 OmniSky reported that it was no longer able to complete its financial statements due to a possible pending bankruptcy. OmniSky sold to EarthLink EarthLink is an American Internet service provider. It went public on NASDAQ in January 1997. Much of the company's growth was via acquisition; by 2000, ''The New York Times'' described Earthlink as the "second largest Internet service provider ... in December 2001. References {{tech-company-stub Companies disestablished in 2001 Palm OS software ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apple Newton
The Newton is a series of personal digital assistants (PDAs) developed and marketed by Apple Computer, Inc. An early device in the PDA category (the Newton originated the term), it was the first to feature handwriting recognition. Apple started developing the platform in 1987 and shipped the first devices in August 1993. Production officially ended on February 27, 1998. Newton devices ran on a proprietary operating system, Newton OS; examples include Apple's MessagePad series and the eMate 300, and other companies also released devices running on Newton OS. Most Newton devices were based on the ARM 610 RISC processor and all featured handwriting-based input. The Newton was considered technologically innovative at its debut, but a combination of factors, including its high price and early problems with its handwriting recognition feature, limited its sales. This led to Apple ultimately discontinuing the platform at the direction of Steve Jobs in 1998, a year after his return ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Original Equipment Manufacturer
An original equipment manufacturer (OEM) is generally perceived as a company that produces non-aftermarket parts and equipment that may be marketed by another manufacturer. It is a common industry term recognized and used by many professional organizations such as SAE International, ISO, and others. However, the term is also used in several other ways, which causes ambiguity. It sometimes means the maker of a system that includes other companies' subsystems, an end-product producer, an automotive part that is manufactured by the same company that produced the original part used in the automobile's assembly, or a value-added reseller.Ken Olsen: PDP-1 and PDP-8 (page 3) , economicadventure.com Automotive parts When referring to auto parts, OEM refers to the manufact ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bandwidth (signal Processing)
Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies. It is typically measured in hertz, and depending on context, may specifically refer to '' passband bandwidth'' or ''baseband bandwidth''. Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a band-pass filter, a communication channel, or a signal spectrum. Baseband bandwidth applies to a low-pass filter or baseband signal; the bandwidth is equal to its upper cutoff frequency. Bandwidth in hertz is a central concept in many fields, including electronics, information theory, digital communications, radio communications, signal processing, and spectroscopy and is one of the determinants of the capacity of a given communication channel. A key characteristic of bandwidth is that any band of a given width can carry the same amount of information, regardless of where that band is located in the frequency spectrum. For exa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Advanced Mobile Phone System
Advanced Mobile Phone System (AMPS) was an analog mobile phone system standard originally developed by Bell Labs and later modified in a cooperative effort between Bell Labs and Motorola. It was officially introduced in the Americas on October 13, 1983,Private Line and was deployed in many other countries too, including Israel in 1986, Australia in 1987, Singapore in 1988, and Pakistan in 1990. It was the primary analog mobile phone system in North America (and other locales) through the 1980s and into the 2000s. As of February 18, 2008, carriers in the United States were no longer required to support AMPS and companies ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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