Gprs Edge Evdo
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US $90.00
Working of Cell Phones
Cell phones or cellular phones are so called as they cover compartmentalized, cell like areas. The origin of the Cell phone can be traced back to the year 1973 when Motorola came up with World`s first cellular portable telephone which was commercialised as Motorola DynaTAC 8000X.
These days, new cell phones are being added at a rapid pace. The parts of them typically consist of following: circuit board; antenna; keyboard; LCD - liquid crystal display; battery; microphone; speaker.
In recent times, they are available with a wide range of functions. To list a few functions, depending on the type of cell phone you choose: store contact information; keep track of appointments; set reminders; prepare to-do lists; send/receive e-mail; play games; send text messages (sms); access to internet; watch and enjoy TV; built-in calculator; integration with other devices like GPS receivers, MP3 players, etc.
Cell phones, operating on radio frequency, have come up with an innovative cellular approach to counter limited availability of RF spectrum. Now, several cell phone towers are used to cater to a large geographic area.
Each tower (base station), covers a circular area called a cell. A large region is split into a number of cells allowing different base stations to use the same channels/frequencies for communication. This enables thousands and thousands of mobile telephone users to share far fewer channels.
Another important aspect is that, phones need less power to transmit to reach any base station as each base station covers a smaller area. Reducing the required transmit power reduces the size of the battery and thereby the weight of the phone. This has led to miniaturization of cell phones which would not have been possible without the cellular technology.
When you use your cell phone, following things happen. First the phone locates base station having strongest signal, and requests for a channel assignment. The base station permits channel assignment and the call gets accepted. The call is then forwarded to the local telephone network if it is to a regular phone otherwise it is transmitted through the cellular network. The call is then sent to its destination through the telephone network.
When the cell phone is switched on, SID (System Identification Code) on the control channel compares it to the SID programmed into the phone. If the SIDs match, the phone understands that the cell is communicating with home system. The phone sends a registration request, along with the SID and the MTSO keeps track of the phone`s location in a database. If the SID on the control channel does not match the SID of your phone, then the phone is in roaming.
The three technologies commonly used by 2G cell phone networks for transmitting information: frequency division multiple access (FDMA); time division multiple access (TDMA); code division multiple access (CDMA).
GSM (Global System for Mobile communications) implements TDMA, to connect to the specific service providers in different countries. GSM uses subscriber identification module (SIM). SIM stores all the connection data/identification numbers needed to access a particular wireless service provider.
Standard 2.5G protocols used widely are GPRS, EDGE to name a few. Some latest 3G protocols are: Universal Mobile Telecommunication Service (UMTS); Wideband Code-Division Multiple Access (WCDMA); High-Speed Downlink Packet Access (HSDPA); Evolution Data Maximized (EVDO).
A few popular cell phone models in the market have been offered by Nokia, Ericsson, Motorola, Samsung, LG, etc. with each model with its own range of collections.The year 2008 may be a high watermark in the cell phone history with Nokia N-Gage 2, HTC Dream, Apple iPhone 2, BlackBerry Touchscreen, Sony PlayStation Phone which are expected to be launched.
About the Author
This article can be accessed in portuguese from the Article section of page www.polomercantil.com.br/celular.php
Roberto Sedycias works as IT consultant for www.PoloMercantil.com.br
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GPRS Networks $140 GPRS is a packet based wireless communication service that offers data rates from 9.05 up to 171.2 Kbps and continuous connection to the Internet for mobile phone and computer users. GPRS is based on GSM communications and complements existing services such as circuit switched cellular phone connections and the Short Message Service (SMS). GPRS represents the bridge between 2G and 3G mobile telecommunications and is commonly referred to as 2.5G. Implementation of GPRS requires modification of the existing GSM networks in that GSM is a circuit switched technology while GPRS is packet oriented. GPRS enables packet data (the same as is used by an Ethernet LAN, WAN or the Internet) to be sent to and from a mobile station - e.g. mobile phone, PDA or Laptop. WAP and SMS can also be sent using GPRS and individuals working with GPRS need to learn and understand how the mobile stations, the air interface, network architecture, protocol structures and signalling procedures must be modified. GPRS offers much higher data rates than GSM and can be combined with 3G technologies such as EDGE to give even higher bit-rates. It offers many benefits for customers and network operators: such as volume (rather then time) dependent billing and more efficient use of network resources. Due to the worldwide delay in implementing 3G solutions such as CDMA and UMTS the demand for GPRS is still growing. GPRS Networks : Offers detailed information ranging from standards to practical implementation Answers 'how' and 'why' rather than just simply re-stating GPRS specifications Provides comprehensive coverage in a single volume Essential reading for all telecommunications project managers, field engineers, technical staff in network operator and manufacturing organisations, GPRS application and service developers, Datacoms/IT engineers. The comprehensive coverage also makes this a superb reference for students of computer science, telecommunications and electrical engineering. |
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GSM, GPRS and EDGE Performance $140 GSM, GPRS and EDGE Performance - Second Edition provides a complete overview of the entire GSM system. GSM (Global System for Mobile Communications) is the digital transmission technique widely adopted in Europe and supported in North America.  It features comprehensive descriptions of GSM’s main evolutionary milestones - GPRS, (General Packet Radio Services) is a packet-based wireless communication service that promises data rates from 56 up to 114 Kbps and continuous connection to the Internet for mobile phone and computer users. AMR and EDGE (Enhanced Data GSM Environment), and such developments have now positioned GERAN (GSM/EDGE Radio Access Network) as a full 3G radio standard.  The radio network performance and capabilities of GSM, GPRS, AMR and EDGE solutions are studied in-depth by using revealing simulations and field trials. Cellular operators must now roll out new 3G technologies capable of delivering wireless Internet based multimedia services in a competitive and cost-effective way and this volume, divided into three parts, helps to explain how: 1. Provides an introduction to the complete evolution of GSM towards a radio access network that efficiently supports UMTS services (GERAN). 2. Features a comprehensive study of system performance with simulations and field trials. Covers all the major features such as basic GSM, GPRS, EDGE and AMR and the full capability of the GERAN radio interface for 3G service support is envisaged. 3. Discusses different 3G radio technologies and the position of GERAN within such technologies.  Featuring fully revised and updated chapters throughout, the second edition contains  90 pages of new material and features the following new sections, enabling this reference to remain as a leading text in the area: Expanded material on GPRS Includes IMS architecture (Rel’5) and GERAN (Rel’6) features Presents field trial results for AMR and narrowband  Provides EGPRS deployment guidelines Features a new chapter on Service Performance An invaluable reference for Engineering Professionals, Research and Development Engineers, Business Development Managers, Technical Managers and Technical Specialists working for cellular operators |
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Cisco HWIC3GCDMAV= 3G Hwic Verizon Evdo $937.66 The cisco 3G wireless wan HWIC CDMA radio modem are the first enterpriseclass 3G wireless wan solution. Suitable for both backup and primary applications the cisco 3G wireless wan HWIC support the latest CDMA standards and are backward compatible with the widely deployed networks (1xRTT GPRS/EDGE). Spare product. Carrier service: verizon. Portability. Performance. Reduced cost. Short installation time. Integrated 3G WWAN broadband. Network resiliency through WAN diversity. Dimension: 0.75 Height x 3.07 Width x 4.88 Depth. External Interfaces:. RJ45 Interface. TNC RF Port. HWIC3GCDMAx main and diversity Antenna Connector. Wireless Technologies Supported:. CDMA 1xEVDO Rev A. CDMA 1xEVDO Rel 0. CDMA 1xRTT. Network Management and Diagnostics:. Inband and outofband management using Telnet (IOS CLI) and Simple Network Management Protocol (SNMP) including MIB II and other extensions. Industrystandard 3G Diagnostics and Monitoring Tools (QUALCOMM CDMA Air Interface Tester [CAIT] and Spirent Universal Diagnostic Monitor [UDM]). |
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Yx645 - Wi-Ex Yx645 Cellular Phone Signal Booster - 800 Mhz To 1900 Mhz - Gsm, Cdma - Evdo, 3G, Hspa, Gprs, Edge - Panel Antenna $500.21 a Revolutionary Cell Phone Signal Booster For Demanding Professional Coverage Applications, The Zboost Designed Yx645, For Custom Installers, is a Bi-directional Amplifier (bda) System Which Captures And Amplifies The Cell Signal to Extend a Cell Zone? up to 12,000 Square Feet. The Yx645 is Designed For The Professional Installer And is Available For The 800 Mhz Cellular, The 1900 Mhz Pcs Band or Dual Band (both 800 Mhz And 1900 Mhz Bands). [2773822] UPC: 186639000892 UNSPC: 43222608 20.3L x 14.2W x 6.7H 8 LB |
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Yx540 - Wi-Ex Zboost Yx540 Cellular Phone Signal Booster - 800 Mhz To 1900 Mhz - Gsm, Cdma - 3G, Hspa, Evdo, Gprs, Edge, Umts $150.78 Designed For Consumers, in Single Story Urban Dwellings, The Zboost Metro Dual Band Boosts Indoor Signal For All Phones And Mobile Devices (except Nextel Phones) And All US Carriers Using 800 And 1900 Mhz. The Zboost Metro For The Home or Office Extends an Indoor Cell Zone up to 1500 sq Ft. And Doesn't Require an Outside Antenna Placement. [YX540] UPC: 186639000458 UNSPC: 43222608 9.4L x 7.2W x 5.1H 2.95 LB |
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Yx545 - Wi-Ex Zboost Yx545 Cellular Phone Signal Booster - 800 Mhz To 1900 Mhz - Gsm, Cdma - Umts, Evdo, 3G, Hspa, Rtt, Gprs, Edge $202.28 Designed For Consumers, The Improved Zboost Soho Yx545 Cell Phone Signal Booster Extends a Cell Zone For Multiple Users And All Devices Operating on 800 And 1900 Mhz Frequency Bands Except Those Using Nextel/iden, 4G or 2100mhz. The New Zboost Soho Improves Coverage by 20% Over The Zboost Yx510 And Boosts Signal up to 3000 Square Feet, Making it Perfect For Your Home or Office. The Package Includes Everything You Need: Zboost Amplifier Base Unit, Base Unit Antenna, Power Supply, Coaxial Cable (rg59-mini), Signal Antenna And Mounting Hardware. The Wide Radio Wave Beam Width Directional Antenna Receives Signals From Multiple Cell Towers. [YX545] UPC: 186639000663 UNSPC: 43221706 3L x 10.7W x 7.5H 2.4 LB |
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GPRS and EDGE Engineering $63.37 No Synopsis Available |
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USB GSM/GPRS/EDGE Wireless Modem Adapter with Antenna $34.9 - This is a quad-band wide area wireless modem supporting all the different frequencies used by EDGE and GSM, GPRS networks worldwide. Users around the globe can enjoy the freedom to have access to critical information wherever they are located on both EDGE and GSM, GPRS networks.- Supports GSM, GPRS, EDGE 850, 900, 1800, 1900MHz- Speed rates: EDGE: 460.8Kbps, 123.7Kbps(DL, UL); GPRS:(CS4)85.6Kbps, 42.8Kbps(DL, UL); GPRS:(CS2)53.6Kbps, 26.8Kbps(DL, UL); GSM:9.6Kbps, 14.4Kbps(DL, UL)- EDGE multi-slot class 12 (up to 4TX, 4RX, 5 totals)- Browses Internet with high speed- File transmission- Receives and sends E-mail- Receives and sends short message (SMS)- Express Card interface, hot plugging and hot pull out- Support windows 2000, 2003, XP, Vista, Server 2008 operation system- External removable antenna- Package includes: 1*GSM, GPRS, EDGE USB Wireless Modem, 1*2.5mm earphone, 1*Installation CDSpecificationsDimensions: 4.02 in x 1.54 in x 0.51 inWeight: 5.68 oz |
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GPRS $99 This innovative new book explains how GPRS (general packet radio service) allows you to expand your GSM networks towards third generation mobile communications to meet the demands of the most-sophisticated mobile data applications. The book concentrates on the interfaces between the known GSM network elements and the new subsystems -- PCU, SGSN, and GGSN -- that come with GPRS. It offers you an in-depth explanation of the extensions and methods of the GSM air interface necessary for GPRS and shows how the channel-oriented GSM is linked to the packet switched GPRS. Moreover, it explains what extensions there are in channel coding, how resources are allocated on the air interface, and how the quick network access necessary for GPRS is made possible. |
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free shipping! EF1403 RS232 hsdpa wireless modem, triple band 850/1800/1900Mhz 3g hsdpa modem, compatible with edge and gprs $205.26 1. hsdpa modem, rs232 modem, 2. quad band 850/1800/1900Mhz, compatible with EDGE and gprs 3. Support SMS and CSD function |
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Motion Computing Motion 10.1" LED Net-tablet PC - Wi-Fi - HSDPA, EDGE, EVDO - Intel Atom Z670 1.50 GHz - Multi-touch Screen ... $1372.43 Motion Computing Motion 10.1" LED Net-tablet PC - Wi-Fi - HSDPA, EDGE, EVDO - Intel Atom Z670 1.50 GHz - Multi-touch Screen ... |
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Class 10 Edge/Class 12 Gprs Router $658.99 WIRELESS ROUTER - WIRELESS CELLULAR MODEM - ETHERNET;FAST ETHERNET - WIRED;WIREL |
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Dc-Wan-A101-A - Digi Digi Connect Wan Gprs Modem With Antenna $378.1 digi Connect Wan Products Provide High-performance Wireless Communications Via Gsm (gprs/edge/hsdpa). Digi Connect Wan Product Seamlessly Integrates With Digi Connectware Manager Enterprise Software, Which Provides Easy Setup, Configuration And Maintenance of Large Installations. [2373723] UPC: 663072939762 UNSPC: 43222628 10L x 8W x 4H 1.8 LB 0.19 Cubes |
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Acer ICONIA TAB A501 10.1" 16 GB Tablet Computer - Wi-Fi - UMTS, HSPA+, HSDPA, HSUPA, GPRS, EDGE, 3G - nVidia Tegra 2 250 1 ... $544.42 Acer ICONIA TAB A501 10.1" 16 GB Tablet Computer - Wi-Fi - UMTS, HSPA+, HSDPA, HSUPA, GPRS, EDGE, 3G - nVidia Tegra 2 250 1 ... |
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3g usb modem EF300 7.2M 2100Mhz compatible with EDGE and gprs $29.98 usb modem, 3g data card, usb modem 1,HSDPA 7.2Mbps DL,5.76Mbps UL 2,EDGE 460Kbps Download 3,GPRS 115Kbps support SD Card |
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GSM, GPRS and EDGE Performance: Evolution Towards 3G/UMTS, 2nd Edition $132.49 No Synopsis Available |
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Cradlepoint / BUSINESS GRADE MODEM 3G EVDO / MC100E-SP $249.02 Cradlepoint - BUSINESS GRADE MODEM 3G EVDO - MC100E-SP |
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Cradlepoint / BUSINESS GRADE MODEM 3G EVDO / MC100E-VZ $249.02 Cradlepoint - BUSINESS GRADE MODEM 3G EVDO - MC100E-VZ |
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free shipping! promotion EF800 USB 3G EVDO Modem $127.63 3G EVDO Modem EVDO RevO 2.4Mbps DL,154kbps UL |
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GPRS in Practice $130 Professionals quickly discover that, although the technical specifications for GPRS cover all parts of the engineering functions in detail and depth, they are lacking in one important feature; the conceptual framework within which the specifications sit - GPRS in Practice fills this gap. By beginning with an explanation of why GPRS is necessary and describing the core concept of GPRS operations, the TBF (Temporary Block Flow), a revision section then covers the GSM Air Interface with its Radio, Physical and Logical channels and this progressively leads to the GPRS logical channels - what they do and how they do it. The book then moves on to a brief introduction of the GPRS protocol stack which provides a launch pad for a detailed trip into all the layers of this stack, with detailed diagrams and explanations of each layer integrated into an overall understanding of how the GPRS service operates in practice. Provides descriptions of why procedures are specified and then clearly explains how the specifications work in practice  Provides a layered view of the GPRS protocol and deals in detail with each layer separately  Includes numerous acronyms and abbreviations accompanied by their full meaning An invaluable resource for Mobile network operators, Development and deployment engineers and Handset designers. |
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ToughMate Always-On 19 EVDO - Notebook carrying case $92.99 Panasonic ToughMate Always-On 19 EVDO - Notebook carrying case - for Toughbook 19 |
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SIMCOM gsm/gprs module sim900b $17.89 )SIM900B, GSM GPRS GPS module,GSM GPRS module SIM900B SIM900 SIM900A SIM900D 2)SIMCOM gsm/gprs module SIM900B |
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Cisco / 3G WWAN HWIC-EVDO REV A/REL / HWIC-3G-CDMA-V= $600.15 Cisco - 3G WWAN HWIC-EVDO REV A/REL - HWIC-3G-CDMA-V= |
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Sierra Wireless C2521-VD Cellular Modem EVDO/CDMA/GPS $373.06 Sierra Wireless C2521-VD Cellular Modem EVDO/CDMA/GPS |
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Airlink Raven XE Evdo Ethernet/USB Verizon DC Power V2221-VD $373.06 Airlink Raven XE Evdo Ethernet/USB Verizon DC Power V2221-VD |
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Cisco 3G Wireless HWIC-EVDO WAN Card HWIC3GCDMAS= $577.2 Cisco 3G Wireless HWIC-EVDO WAN Card HWIC3GCDMAS= |
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Cisco 3G WWAN HWIC-EVDO Rev A/Rel 0/1xRTT-800/1900MHz HWIC3GCDMASRF $346.66 Cisco 3G WWAN HWIC-EVDO Rev A/Rel 0/1xRTT-800/1900MHz HWIC3GCDMASRF |
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Cisco 3G Wireless HWIC-EVDO WAN Card HWIC3GCDMAV= HWIC-3G-CDMA-V= $577.2 Cisco 3G Wireless HWIC-EVDO WAN Card HWIC3GCDMAV= HWIC-3G-CDMA-V= |
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Cisco 3G WWAN HWIC-EVDO Rev A/Rel 0/1xRTT-800/1900MHz HWIC-3G-CDMA-V $346.66 Cisco 3G WWAN HWIC-EVDO Rev A/Rel 0/1xRTT-800/1900MHz HWIC-3G-CDMA-V |
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CradlePoint BUSINESS GRADE MODEM 3G EVDO VERIZON MC100EVZ $252.64 CradlePoint BUSINESS GRADE MODEM 3G EVDO VERIZON MC100EVZ |
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CradlePoint BUSINESS GRADE MODEM 3G EVDO SPRINT MC100ESP $249.38 CradlePoint BUSINESS GRADE MODEM 3G EVDO SPRINT MC100ESP |
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Dell Mobile BroadBand Wireless 5720 Evdo (Sprint) Mini PCI MN624 $20.54 Dell Mobile BroadBand Wireless 5720 Evdo (Sprint) Mini PCI MN624 |
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Industrial Evdo Verizon Cellular Vpn Router Including Ethernet And Rs-232/422/48 $702.99 INDUSTRIAL EVDO VERIZON CELLULAR VPN ROUTER INCLUDING ETHERNET AND RS-232/422/48 |
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Connectport Wan 3g W/Embedded Verizon Evdo Rev A Module & Vpn $862.99 CONNECTPORT WAN 3G W/EMBEDDED VERIZON EVDO REV A MODULE VPN |
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Industrial Evdo Sprint Cellular Vpn Router Including Ethernet And Rs-232/422/485 $741.99 DIGI CONNECT WAN 3G IA (CDMA/EVDO SPRINT |
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Infocase Full Func Case Allows Tab/Lptp Md Evdo For Cf-19 $85.99 INFOCASE FULL FUNC CASE ALLOWS TAB/LPTP MD EVDO FOR CF-19 |
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801212 - Wilson 801212 Cellular Phone Signal Booster - 824 Mhz To 1990 Mhz - Cdma, Tdma, Gsm, Amps - Hsdpa, Evdo, Edge $287.16 [801212] UPC: 813986006672 2.75 LB |