This was sent over the radio as MDC-1200 or MDC-4800 data to a system controller, which plotted the mobile's approximate location on a map.

RTTY, using either AFSK or FSK modulation, is moderately resistant to vagaries of HF propagation and interference, however modern digital modes, such as MFSK, use Forward Error Correction to provide much better data reliability.

Audio frequency-shift keying ( AFSK ) is a modulation technique by which digital data is represented by changes in the frequency ( pitch ) of an audio tone, yielding an encoded signal suitable for transmission via radio or telephone.

AFSK is not always used for high-speed data communications, since it is far less efficient in both power and bandwidth than most other modulation modes.

Some early microcomputers used a specific form of AFSK modulation, the Kansas City standard, to store data on audio cassettes.

AFSK is still widely used in amateur radio, as it allows data transmission through unmodified voiceband equipment.

The header is an AFSK data burst, with each individual bit lasting 1920 μs ( 1. 92 ms ) each, giving a bit rate of 520 bits per second.

It specifies audio frequency-shift keying ( AFSK ) to encode and transfer data at a rate of 1200 bits per second, half-duplex at 1200 baud ( Mode 2 ), ( or at a " fallback rate " of 600 baud, mode 1 ) for the forward data-transmission channel, and an optional 75 baud backward channel.

It specifies audio frequency-shift keying ( AFSK ) to encode and transfer data at a rate of 1200 bits per second, half-duplex ( one-way ) using differential phase-shift keying ( DPSK ) modulation.

Occasionally, an AFSK signal modulating an RF carrier ( A2B, F2B ) is used on VHF or UHF frequencies.

AFSK is used in the Emergency Alert System to notify stations of the type of emergency, locations affected, and the time of issue without actually hearing the text of the alert.

AFSK is also used in the United States ' Emergency Alert System to transmit warning information.

In its most widely used form, APRS is transported over the AX. 25 protocol using 1200 bit / s Bell 202 AFSK on frequencies located within the 2 meter amateur band.

In some European countries ,( and perhaps elsewhere ), V. 23 Mode 2 AFSK modulation, ( without the backward channel ) is used to transmit Caller ID information over POTS lines in the public telephone network.

In North America ( and perhaps elsewhere ), Bell 202 AFSK modulation is used to transmit Caller ID information over POTS lines in the public telephone network.

In early 1949, the first American transcontinental two-way RTTY QSO was accomplished on 11 meters using AFSK between Tom McMullen ( W1QVF ) operating at W1AW and Johnny Agalsoff, W6PSW.

Bluetooth is a proprietary open wireless technology standard for exchanging data over short distances ( using short-wavelength radio transmissions in the ISM band from 2400 – 2480 MHz ) from fixed and mobile devices, creating personal area networks ( PANs ) with high levels of security.

Cellular Digital Packet Data ( CDPD ) was a wide-area mobile data service which used unused bandwidth normally used by AMPS mobile phones between 800 and 900 MHz to transfer data.

It was particularly popular as a first-generation wireless data solution for telemetry devices ( machine to machine communications ) and for public safety mobile data terminals.

2. mobile data intermediate system: specialized intermediate systemthat routes data based on its knowledge of the current location of Mobile end system.

Specific examples are speech compression and transmission in digital mobile phones, room correction of sound in hi-fi and sound reinforcement applications, weather forecasting, economic forecasting, seismic data processing, analysis and control of industrial processes, medical imaging such as CAT scans and MRI, MP3 compression, computer graphics, image manipulation, hi-fi loudspeaker crossovers and equalization, and audio effects for use with electric guitar amplifiers.

Global mobile data traffic will grow at a CAGR of 131 percent between 2008 and 2013, reaching over two exabytes per month by 2013.

The event will offer approximately 200 software-related sessions on application transformation, Converged Infrastructure, information optimization, mobile devices, webOS, global data centers, security, hybrid delivery and cloud computing.

Enhanced Data rates for GSM Evolution ( EDGE ) ( also known as Enhanced GPRS ( EGPRS ), or IMT Single Carrier ( IMT-SC ), or Enhanced Data rates for Global Evolution ) is a digital mobile phone technology that allows improved data transmission rates as a backward-compatible extension of GSM.

Encryption is also used to protect data in transit, for example data being transferred via networks ( e. g. the Internet, e-commerce ), mobile telephones, wireless microphones, wireless intercom systems, Bluetooth devices and bank automatic teller machines.

In 2011, there were over 3, 5 million broadband subscribtions in Finland, and the number of both them and mobile data transmission subscriptions continued to grow.

Mobile phone technology is constantly advancing and the current operator Gibtelecom has kept pace with developments including the advent of data access via mobile phones.

TELE Greenland provides switched telephone and data, land mobile communications, VHF and MF shore-to-ship communication, and television and radio broadcasting.

This mobile suit was the original Gundam designed by the five scientists, but was never constructed due to its signature feature: the ZERO System, a combat system that directly interfaces with the pilot's brain and feeds the pilot tactical data on the fly.

General packet radio service ( GPRS ) is a packet oriented mobile data service on the 2G and 3G cellular communication system's global system for mobile communications ( GSM ).

A DTM-capable mobile may use simultaneous voice and packet data, with the network coordinating to ensure that it is not required to transmit on two different frequencies at the same time.

Following the UK government's move towards opening up its data, a number of new mobile phone apps and services have been developed to help Londoners claim their refund more efficiently.

Following the completion of the upgrades in related software and hardware, China Unicom will be equipped with the facilities needed to provide high-speed mobile data services for users in Macau, including broadcasting and video telephony.

A personal digital assistant ( PDA ), also known as a palmtop computer, or personal data assistant, is a mobile device that functions as a personal information manager.

( Pulse 87 did gain a foothold in the New York City market, and was poised to expand into other major markets, but the format's parent company went bankrupt before that could happen, and the format is now only available via Internet and mobile streaming.

Meanwhile, the rise of satellite radio services as a major competitor have brought many of the advantages of Internet radio to an increasingly mobile listening public, including lack of censorship, greater choice, a more eclectic approach to format programming, and static-free digital sound quality.

Increasingly, this format is being adopted by social and mobile games, often described using the term " asynchronous multiplayer.

In particular, the specific format for mobile phones is called SVGT ( SVG Tiny version ).

In addition to being a media player, Windows Media Player includes the ability to rip music from and copy music to compact discs, burn recordable discs in Audio CD format or as data discs with playlists such as an MP3 CD, synchronize content with a digital audio player ( MP3 player ) or other mobile devices, and enable users to purchase or rent music from a number of online music stores.

Messages are converted to be delivered in email format or over HTTP to a preconfigured address ; the mobile unit does not include a destination address when sending a SBD message.

For handheld / mobile games, it is also necessary to post-process the imagery, converting it to a format native to the hardware the game will run on.

* OpenDocument Presentation, a standard mobile electronic office documents file format made by Sun Microsystems ( OpenOffice. org XML ), standards set by OASIS technical committee.

Knowledge bases can exist on both computers and mobile phones in a hypertext format.

One of the UK's top-earning TV format exports, Pop Idol made extensive use of premium-priced viewer interactivity, with viewers voting by telephone, mobile telephone texting ( not used on series one ), through the " red button " on digital television sets, or via the official website.

An alternative to inbound SMS is based on long numbers ( international mobile number format, e. g., + 44 7624 805000, or geographic numbers that can handle voice and SMS, e. g., 01133203040 ), which can be used in place of short codes or premium-rated short messages for SMS reception in several applications, such as TV voting, product promotions, and campaigns.

In October 2006, MapQuest sold off its publishing division ( which published traditional maps in paper format ) to concentrate on its online and mobile services.

Notebook computers are an increasingly popular format of the broader category of mobile computers.

The speaking clock in South Africa is reached by dialling 1026 from fixed or mobile networks and consists of a female voice reading the time in 24-hour format, alternating between Afrikaans and English.

Deinterlacing is required for interlaced archive programs when the broadcast format or media format is progressive, as in EDTV 576p or HDTV 720p50 broadcasting, or mobile DVB-H broadcasting ; there are two ways to achieve this.

In contrast, access servers might take a mobile call or a call originating from a traditional phone line, convert it to IP traffic, then send it over the internet to another such device, which terminates the call by reversing the process and converting the Voice over IP call back to ISDN digital or analog / PSTN format, and connecting it to a destination phone number.

Many modern mobile telephone handsets can store short audio recordings in the AMR format, and both free and proprietary programs exist ( see Software support ) to convert between this and other formats, although AMR is a speech format and is unlikely to give ideal results for other audio.

Real-time transcoding in a many-to-many way ( any input format to any output format ) is becoming a necessity to provide true search capability for any multimedia content on any mobile device, with over 500 million videos on the web and a plethora of mobile devices.

In mainland China, mobile phone numbers have 11 digits in the format 1xx-xxxx-xxxx.