Circuit Switched Data (CSD) is the original form of data transmission developed for the time division multiple access (TDMA)-based mobile phone systems like Global System for Mobile Communications (GSM). CSD uses a single radio time slot to deliver 9.6 kbit/s data transmission to the GSM Network and Switching Subsystem where it could be connected through the equivalent of a normal modem to the Public Switched Telephone Network (PSTN) allowing direct calls to any dial-up service. A list of Mobile phones standards or generations is given in the table below. ... Global System for Mobile communications (GSM: originally from Groupe Spécial Mobile) is the most popular standard for mobile phones in the world. ... Universal Mobile Telecommunications System (UMTS) is one of the third-generation (3G) mobile phone technologies. ... This article or section does not adequately cite its references or sources. ... Global System for Mobile communications (GSM: originally from Groupe Spécial Mobile) is the most popular standard for mobile phones in the world. ... This article does not cite any references or sources. ... General Packet Radio Service (GPRS) is a Mobile Data Service available to users of Global System for Mobile Communications (GSM) and IS-136 mobile phones. ... Enhanced Data rates for GSM Evolution (EDGE) or Enhanced GPRS (EGPRS), is a digital mobile phone technology that allows increased data transmission rates and improved data transmission reliability. ... Enhanced Data rates for GSM Evolution (EDGE) or Enhanced GPRS (EGPRS), is a digital mobile phone technology that allows increased data transmission rates and improved data transmission reliability. ... High-Speed Circuit-Switched Data (HSCSD), is a development of Circuit Switched Data, the original data transmission mechanism of the GSM mobile phone system. ... Universal Mobile Telecommunications System (UMTS) is one of the third-generation (3G) cell phone technologies. ... 3G is the third generation of mobile phone standards and technology, after 2G. It is based on the International Telecommunication Union (ITU) family of standards under the International Mobile Telecommunications programme, IMT-2000. 3G technologies enable network operators to offer users a wider range of more advanced services while achieving... High-Speed Packet Access (HSPA) is a collection of mobile telephony protocols that extend and improve the performance of existing UMTS protocols. ... High-Speed Downlink Packet Access (HSDPA, also known as High-Speed Downlink Protocol Access) is a 3G (third generation) mobile telephony communications protocol in the High-Speed Packet Access (HSPA) family, which allows networks based on Universal Mobile Telecommunications System (UMTS) to have higher data transfer speeds and capacity. ... High-Speed Uplink Packet Access (HSUPA) is a 3G mobile telephony protocol in the HSPA family with up-link speeds up to 5. ... Evolved HSPA (also known as HSPA Evolution) is a 3G mobile data protocol defined in 3GPP release 7 (expected in 2007). ... UMTS-TDD is a mobile data network standard built upon the UMTS 3G cellular mobile phone standard, using a TD-CDMA, TD-SCDMA, or other 3GPP-approved, air interface that uses Time Division Duplexing to duplex spectrum between the up-link and down-link. ... UMTS-TDD is a mobile data network standard built upon the UMTS 3G cellular mobile phone standard, using a TD-CDMA, TD-SCDMA, or other 3GPP-approved, air interface that uses Time Division Duplexing to duplex spectrum between the up-link and down-link. ... TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) is a 3G mobile telecommunications standard, being pursued in the Peoples Republic of China by the Chinese Academy of Telecommunications Technology (CATT), Datang and Siemens AG, in an attempt to develop home-grown technology and not be dependent on Western... FOMA, officially short for Freedom of Mobile Multimedia Access, is the brand name for the 3G services being offered by Japanese mobile phone operator NTT DoCoMo. ... Universal Mobile Telecommunications System (UMTS) is one of the third-generation (3G) cell phone technologies. ... This article is about the mobile phone standard. ... 3GPP LTE (Long Term Evolution) is the name given to a project within the Third Generation Partnership Project to improve the UMTS mobile phone standard to cope with future requirements. ... High Speed OFDM Packet Access (HSOPA) is a proposed part of 3GPPs Long Term Evolution (LTE) upgrade path for UMTS systems. ... Interim Standard 95 (IS-95), is the first CDMA-based digital cellular standard pioneered by Qualcomm. ... CDMA2000 is a hybrid 2. ... The 3rd Generation Partnership Project 2 (3GPP2) is a collaboration agreement that was established in December 1998. ... Interim Standard 95 (IS-95), is the first CDMA-based digital cellular standard pioneered by Qualcomm. ... This article does not cite any references or sources. ... CDMA2000 is a hybrid 2. ... 3G is the third generation of mobile phone standards and technology, after 2G. It is based on the International Telecommunication Union (ITU) family of standards under the International Mobile Telecommunications programme, IMT-2000. 3G technologies enable network operators to offer users a wider range of more advanced services while achieving... Evolution-Data Optimized or Evolution-Data only, abbreviated as EV-DO or EVDO and often EV, is one telecommunications standard for the wireless transmission of data through radio signals, typically for broadband Internet access. ... Ultra Mobile Broadband is the brand name to describe the advanced technologies and services that will be supported by the CDMA2000 1xEV-DO Revision C (Rev. ... This article is about the mobile phone standard. ... Advanced Mobile Phone System (AMPS) is the analog mobile phone system standard developed by Bell Labs, and officially introduced in the Americas in 1983[1][2] It was the primary analog mobile phone system in North America (and other locales) through the 1980s and into the 2000s, and is still... Advanced Mobile Phone System (AMPS) is the analog mobile phone system standard developed by Bell Labs, and officially introduced in the Americas in 1983[1][2] It was the primary analog mobile phone system in North America (and other locales) through the 1980s and into the 2000s, and is still... 1G (or 1-G) is short for first-generation wireless telephone technology, cellphones. ... Advanced Mobile Phone System or AMPS is the analog mobile phone system standard, introduced in the Americas during the early 1980s. ... IS-54 and IS-136 are second-generation (2G) mobile phone systems, known as Digital AMPS (D-AMPS). ... This article does not cite any references or sources. ... Mobile radio telephone systems preceded modern cellular mobile telephony technology. ... “Push to Talk” redirects here. ... The Mobile Telephone System (MTS) was one of the earliest mobile telephone standards. ... The Improved Mobile Telephone Service (IMTS) is a pre-cellular VHF/UHF radio system that links to the PSTN. IMTS was the radiotelephone equivalent of land dial phone service. ... The Advanced Mobile Telephone System was a 0G method of radio communication, mainly used in Japanese portable radio systems. ... OLT (Norwegian for Offentlig Landmobil Telefoni, Public Land Mobile Telephony), was the first land mobile telephone network in Norway. ... MTD (Swedish abbreviation for Mobilelefonisystem D, or Mobile telephony system D) was a manual mobile phone system for the 450 MHz frequency band. ... Autotel (also called PALM, or Public Automated Land Mobile) is a radiotelephone service which was the missing link between earlier MTS/IMTS and later cellular telephone services. ... ARP (Autoradiopuhelin, Car Radio Phone in English) was the first commercially operated public mobile phone network in Finland. ... 1G (or 1-G) is short for first-generation wireless telephone technology, cellphones. ... For other meanings of the abbreviation, see: NMT. NMT (Nordisk MobilTelefoni or Nordiska MobilTelefoni-gruppen, Nordic Mobile Telephone in English) is a mobile phone system that was specified by the Nordic telecommunications administrations (PTTs) starting in 1970, and opened for service in 1981 as a response to the increasing congestion... hicap is a mobile techonology which has a consumer interface with a wide variety of industry references. ... Cellular Digital Packet Data (CDPD) uses unused bandwidth normally used by AMPS mobile phones between 800 and 900 MHz to transfer data. ... Cingular Interactive Truck at Ground Zero on 9/11/2001 Mobitex Network Design Mobitex is an OSI based open standard, national public access wireless data network first introduced in 1991 by carriers RAM Mobile Data and in Canada 1990 by Rogers Cantel. ... DataTac is a wireless data network technology originally developed by Motorola and deployed in the United States as the ARDIS network. ... This article does not cite any references or sources. ... Iden is also a village in East Sussex, England Integrated Digital Enhanced Network (iDEN) is a mobile telecommunications technology, developed by Motorola, which provides its users the benefits of a trunked radio and a cellular telephone. ... Personal Digital Cellular (PDC) is a 2G mobile phone standard developed and used exclusively in Japan. ... The Personal Handy-phone System (PHS), also marketed as the Personal Access System (PAS) and known as Xiaolingtong (小灵通) in China, is a mobile network system operating in the 1880-1930 MHz frequency band, used mainly in Japan, China, Taiwan and some other Asian countries. ... Wideband Integrated Dispatch Enhanced Network, or WiDEN, is a software upgrade developed by Motorola for its iDEN enhanced specialized mobile radio (or ESMR) wireless telephony protocol. ... This article is about the mobile phone standard. ... iBurst (or HC-SDMA, High Capacity Spatial Division Multiple Access) is a wireless broadband technology developed by ArrayComm. ... HIPERMAN stands for High Performance Radio Metropolitan Area Network and is a standard created by the European Telecommunications Standards Institute (ETSI) Broadband Radio Access Networks (BRAN) group to provide a wireless network communication in the 2 - 11 GHz bands across Europe and other countries which follow the ETSI standard. ... Official WiMax logo WiMAX, the Worldwide Interoperability for Microwave Access, is a telecommunications technology aimed at providing wireless data over long distances in a variety of ways, from point-to-point links to full mobile cellular type access. ... WiBro (Wireless Broadband, Korean: 와이브로) is a wireless broadband Internet technology being developed by the Korean telecoms industry. ... Generic Access Network (GAN), also known as Unlicensed Mobile Access (UMA), is a telecommunication system allowing seamless roaming and handover between local area networks and wide area networks using a dual-mode mobile phone. ... In communications, a channel access method is used to share a communications channel or physical communications medium between multiple users. ... FDMA, or frequency-division multiple access, is the oldest and most important of the three main ways for multiple radio transmitters to share the radio spectrum. ... Orthogonal Frequency Division Multiple Access (OFDMA) is a multiple access scheme for OFDM systems. ... Time Division Multiple Access (TDMA) is a technology for shared medium (usually radio) networks. ... Spread-spectrum telecommunications is a technique in which a signal is transmitted in a bandwidth considerably greater than the frequency content of the original information. ... Code division multiple access (CDMA) is the current name for the cellular technology originally known as IS-95. ... Cellular frequencies - the general term which unites radio frequencies utilized by cellular networks to provide service to their subscribers. ... Cellular frequencies - the general term which unites radio frequencies utilized by cellular networks to provide service to their subscribers. ... GSM frequency bands or frequency ranges are the radio spectrum frequencies designated by the ITU for the operation of the GSM system for mobile phones. ... UMTS frequency bands or frequency ranges are the radio spectrum frequencies designated for the operation of the UMTS / HSDPA / HSUPA / HSPA+ system for mobile phones. ... Personal Communications Service or PCS is the name for the 1900-MHz radio band used for digital mobile phone services in Canada and the United States. ... The Specialized Mobile Radio system (SMR) is a conventional two-way radio system, or trunked radio system, operated by a service in the 800 or 900 Mhz bands. ... For other uses, see Data (disambiguation). ... Time division multiple access (TDMA) is a channel access method for shared medium (usually radio) networks. ... The Global System for Mobile communications (GSM: originally from Groupe Spécial Mobile) is the most popular standard for mobile phones in the world. ... Time Division Multiple Access (TDMA) is a technology for shared medium (usually radio) networks. ... In telecommunications and computing, bit rate (sometimes written bitrate) is the frequency at which bits are passing a given (physical or metaphorical) point. It is quantified using the bit per second (bit/s) unit. ... The GSM Core network is the heart of a GSM system, the most common mobile phone system in the world. ... For other uses, see Modem (disambiguation). ... The public switched telephone network (PSTN) is the network of the worlds public circuit-switched telephone networks, in much the same way that the Internet is the network of the worlds public IP-based packet-switched networks. ... In telecommunication, the term dial-up has the following meanings: Dial-up access, typically to the Internet A service feature in which a user initiates service on a previously arranged trunk or transfers, without human intervention, from an active trunk to a standby trunk. ...

Prior to CSD, data transmission over mobile phone systems was done by using a modem, either built into the phone or attached to it. Such systems were limited by the quality of the audio signal to 2.4 kbit/s or less. With the introduction of digital transmission in TDMA-based systems like GSM, CSD provided almost direct access to the underlying digital signal, allowing for higher speeds. At the same time, the speech oriented audio compression used in GSM actually meant that data rates using a traditional modem connected to the phone would have been even lower than with older analogue systems. Audio compression can mean two things: Audio data compression - in which the amount of data in a recorded waveform is reduced for transmission. ... An analog or analogue signal is any time continuous signal where some time varying feature of the signal is a representation of some other time varying quantity. ...

A CSD call functions in a very similar way to a normal voice call in a GSM network. A single dedicated radio time slot is allocated between the phone and the base station. A dedicated "sub-time slot" (16 kbit/s) is allocated from the base station to the transcoder, and finally another time slot (64 kbit/s) is allocated from the transcoder to the Mobile Switching Centre (MSC). Time Division Multiple Access (TDMA) is a technology for shared medium (usually radio) networks. ... The term base station can be used in the context of land surveying, wireless computer networking, and wireless communications. ... The Base Station Subsystem (BSS) is the section of a GSM network which is responsible for transmitting to and receiving radio signals from the mobile phone. ... The GSM Core network is the heart of a GSM system, the most common mobile phone system in the world. ...

At the MSC, it is possible to use a modem to convert to an "analog" signal, though this will typically actually be encoded as a digital pulse-code modulation (PCM) signal when sent from the MSC. It is also possible to directly use the digital signal as an Integrated Services Digital Network (ISDN) data signal and feed it into the equivalent of a remote access server. An analog or analogue signal is any continuously variable signal. ... PCM redirects here. ... ISDN redirects here. ... Remote Access Services (RAS) is a service provided by Windows NT which allows most of the services which would be available on a network to be accessed over a modem link. ...

GSM data transmission has advanced since the introduction of CSD:

• High-Speed Circuit-Switched Data (HSCSD) is a system based on CSD but designed to provide higher data rates by means of more efficient channel coding and/or multiple (up to 4) time slots.
• General Packet Radio Service (GPRS) provides more efficient packet-based data transmission directly from the mobile phone at speeds similar to HSCSD.
• Enhanced Data Rates for GSM Evolution (EDGE) (E-GPRS) and Universal Mobile Telecommunications System (UMTS) provide improved radio interfaces with higher data rates, while still being backward compatible with the GSM core network.

High-Speed Circuit-Switched Data (HSCSD), is a development of Circuit Switched Data, the original data transmission mechanism of the GSM mobile phone system. ... General Packet Radio Service (GPRS) is a Mobile Data Service available to users of Global System for Mobile Communications (GSM) and IS-136 mobile phones. ... Enhanced Data rates for GSM Evolution (EDGE) or Enhanced GPRS (EGPRS), is a digital mobile phone technology that allows increased data transmission rates and improved data transmission reliability. ... Universal Mobile Telecommunications System (UMTS) is one of the third-generation (3G) cell phone technologies. ... The GSM Core network is the heart of a GSM system, the most common mobile phone system in the world. ...

Availability

This article or section may contain original research or unverified claims. Please improve the article by adding references. See the talk page for details. (September 2007)

CSD can be very cost effective for short data transmissions if the subscriber has a "bucket of minutes" with a low per minute cost, even regarded as free, as CSD is charged as a voice call. It is ideal for simple POP3 email checking (one does need a dial-up ISP), but Web viewing is increasingly difficult due to modern web page bandwidth requirements. Image File history File links Emblem-important. ... Post Office Protocol version 3 (POP3) is an application layer Internet standard protocol used to retrieve email from a remote server to a local client over a TCP/IP connection. ...

The T-Mobile system is area/city specific. It works in Denver, Colorado and Savannah, Georgia, and (2003) Las Vegas into SoCal roaming onto Cingular. There is no service in Sarasota, Florida or anywhere in Texas. These were the experiences using T-Mobile on a Nokia 9290 Communicator in 2006. Customer service had essentially no knowledge of their CSD services; always ask to speak to a data specialist, and then one that has CSD knowledge. Fax services required a second number for an additional $10/mo. Denver redirects here. ... Savannah redirects here. ... For further information, see Las Vegas metropolitan area and Las Vegas Strip. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Cingular Wireless is the largest United States mobile phone company, with headquarters in Atlanta, Georgia, United States. ... Cà dZan - a 1925 Sarasota residence that is listed on the National Register of Historic Places Sarasota is a city located in Sarasota County on the central west coast of Florida, USA. Its official limits include Sarasota Bay and several barrier islands between the bay and the Gulf of... For other uses, see Texas (disambiguation). ... Nokia 9210 flipped open. ...

When auto-roaming onto at&t wireless (formerly Cingular Wireless), CSD will work if it works for at&t wireless. The other national auto-roam partners (Dobson, et al.) apparently do not support CSD. at*t wireless states that it stopped providing CSD for new customers as of December 2005. But, customers have apparently gotten CSD service for $3.99/mo, either enrolling online or stating that they need it for faxes.

Currently in Australia CSD is only available on Mobile Plans with Vodafone, Optus and Telstra, however Telstra still offer CSD on Pre-Pay on their Telstra Pre-Paid Plus network, although prices are expensive.

External links

• How to connect using CSD