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Topic: Cellular Switched Data

	[No title]
		The demand for two-way mobile data communications capability can be attributed to the need by firms or individuals to both transmit and receive information when access to the wireline telephone network is not readily available, and when the use of voice transmission services may be impractical, inefficient, or unreliable.
		Analog cellular networks support two alternative means of transmitting data, both of which use the public switched telephone network, together with a data terminal (e.g., a laptop computer), a communications device (e.g., a cellular telephone), and a signal processor (a modem).
		The circuit-switched data transmission is billed according to the duration of the session, while a packet-switched transmission is billed solely on the volume of data sent (in kilobytes).
	www.fcc.gov /ftp/Bureaus/Wireless/Orders/1998/da980514.txt (9535 words)

	MOBILETELLER Mobile Banking Industry White Paper (Site not responding. Last check: 2007-10-24)
		CDPD is a standard developed by McCaw Cellular for sending and receiving data over existing cellular infrastructure.
		CDPD is based on IP and has a data transfer rate of 19 KBPS.
		CDPD is designed to overlay on existing cellular infrastructure and transmits digital packets over idle cellular voice frequencies.
	wings.buffalo.edu /academic/department/som/isinterface/mgs602fall99/mobileteller/white_paper14.html (375 words)

	Cellular Data
		Cellular providers typically charge extra per month to access their WAP content, but it is possible to use a third party WAP gateway to avoid charges (for example see http://www.waptunnel.com/).
		Circuit Switched Data: This type of data is typically used to tether your cell phone to your laptop with a serial cable.
		Cellular data is definitely useful, but for best use, tether to your laptop where you can find a real email program, and a full size screen and keyboard.
	cell.uoregon.edu /data (844 words)

	AMPS Cellular Network for MOTOROLA 4500 / 2950 / 2900 3 WATT CELLULAR BAG PHONE and VEHICLE INSTALL UNITS (Site not responding. Last check: 2007-10-24)
		Since it is difficult to guarantee both ends use the same protocol, it's common for cellular carriers to implement "modem pools", a collection of cellular and landline modems connected to each other and located at the Cellular Switching Office (CSO) used specifically for cellular data transmissions.
		Rather than paying for the total amount of data actually sent and received over the cellular connection, users are charged for the time it takes to transfer the data and close the call.
		Data, on the other hand, is much harder to track since it is sent through co-operating modems using specialized cellular protocols.
	campagna.cnc.net /amps.htm (1012 words)

	Cellular Data
		Since the amount of data to be transmitted is very small and the cost of the equipment is minimal, cellemetry may be an attractive option for those who would otherwise be unable to afford wireless data connectivity.
		Which cellular data solution to use depends on the application and the amount of data to be sent.
		Circuit Switched Cellular Data calls are billed by the minute, just like voice calls, and are generally better for sending amounts of data greater than about 2 kilobytes.
	www.decodesystems.com /mt/97mar (1693 words)

	Cellular Technology
		Cellular technology extends the bounds of a corporation's existing telecommunications infrastructure by connecting mobile units to the public network operated by the local exchange or long distance carriers.
		Cellular providers also have a variety of local, regional or national coverage plans that may be tailored to a specific set of business requirements.
		Switched cellular uses the network the same way a voice call would except data is transmitted and received over the switched, dial-up connection.
	scis.nova.edu /~raciti/cellular.html (5290 words)

	Wireless Data Overview : Circuit Switched vs. Packet Switched
		Cellular and PCS modems use circuit switched transmission, allowing you to dial up over your wireless phone just like you would using a landline connection.
		Packet switched data transmission compresses the data and sends short data bursts between conversations or during gaps in conversations on the voice channels.
		Cellular compatible modems correct this problem, allowing you to maintain a connection even if your call is handed off.
	www.getyourwireless.com /cellular_data.htm (901 words)

	Buy Telco - DSL, cable, T-1, internet access solutions for home and business
		Data packets are transmitted on channels not being used for voice calls.
		Circuit-switched cellular is ideal for applications that require long connection times for data transmission, such as file transfers and terminal emulation.
		Modem pools are equipped with cellular protocols to handle incoming transmissions from cellular modems, and, in turn, transmit the data over landline connections to desktop PC modems that use standard modem protocols.
	www.buytelco.net /NetworkApplications.asp?ID=3501 (1662 words)

	Cellular Services (Site not responding. Last check: 2007-10-24)
		Cellular phone service is the closest thing to a nationwide wireless service that currently exists.
		Although the service is not new (it uses standard analog cellular voice channels), there are a number of competing modem protocols designed to cope with the typically unreliable mobile connections encountered when transitioning between cells or during drop-outs due to shadowing.
		CDPD utilizes the existing cellular network to transmit data on inactive cellular channels, or during circuit set-up and tear-down time when all channels are being used for voice.
	east.isx.com /~tnuss/OA/OA_cellular.html (367 words)

	CDPD - Cellular Digital Packet Data
		Cellular Digital Packet Data (CDPD) is a technique used for transmitting small chunks of data, commonly referred to as packets, over the cellular network in a reliable manner.
		By building CDPD as an overlay to the existing cellular infrastructure, and using the same frequencies as cellular voice, carriers are able to minimize the capital expenditures required to offer the service while offering the same coverage area (footprint) their customer base has grown accustomed to.
		Unlike voice cellular phones, the decision to initiate a transfer, or hand-off from one cell to another cell is under the control of the CDPD M-ES itself, as it is the M-ES which is responsible for monitoring the received signal strength of the cellular channels being used.
	www.emory.edu /BUSINESS/et/cdpd (2617 words)

	The Ultimate General Packet Radio Service Dog Breeds Information Guide and Reference
		Packet-switched data under GPRS is achieved by allocating unused cell bandwidth to transmit data.
		This profile is appropriate for applications where data is sent back-and-forth in roughly equal amount, such as instant messaging.
		For an application such as downloading, HSCSD may be preferred, since circuit-switched data is usually given priority over packet-switched data on a mobile network, and there are few seconds when no data is being transferred.
	www.dogluvers.com /dog_breeds/GPRS (1142 words)

	Cellular Telemetry
		Circuit switched cellular is based on the same concept as a PSTN telephone modem, but uses the wireless cellular network.
		Since this type of service requires a connection to be established and held for the duration of the data transmission, the data costs were based on time and not the amount of data sent.
		Cellular RF voice channels are not in use 100 percent of the time, and CDPD makes use of the unused channel time to send packets of data.
	www.stevenswater.com /telemetry_com/cell_info.html (1154 words)

	Cellular Networking Perspectives on Wireless Data
		While wireless data has been much slower to catch on than wireless voice services, they are slowly growing in acceptance, along with the speeds they provide and their availability.
		A rough estimate of the data capacity of digital cellular is to look at the voice coder bit rates.
		Originally, it was planned that CDPD would transmit data when voice channels were idle, thus not consuming any capacity, but this proved to be too difficult to manage.
	www.cnp-wireless.com /data.html (1311 words)

	Cellular Data Technologies (Site not responding. Last check: 2007-10-24)
		Cellular operators are more interested in digital cellular as a way to increase capacity and to provide a more comprehensive data services.
		Therefore, the trend in cellular data is expected to move away from the cheaper CDPD service.
		Data in these networks are allocated to the same radio bandwidth as a voice call.
	wings.buffalo.edu /academic/department/som/isinterface/mgs602fall99/skybridge/report_jawad.shtml (1351 words)

	telephony standards: GPRS @ filibeto.org
		GPRS is different from a data connection using a GSM phone (Cellular Switched Data or CSD), in that a data connection establishes a circuit, and reserves the full bandwidth of that circuit during the lifetime of the connection.
		GPRS is packet-switched which means that the data connection is not used if no data is being transmitted or received.
		For an application such as downloading, HSCDS may be preferred, since circuit-switched data is usually given priority over packet-switched data on a mobile network, and there are few seconds when no data is being transferred.
	www.filibeto.org /mobile/gprs.html (620 words)

	Cellular Digital Packet Data - CDPD - Cell Cellular modem
		CDPD became a networking standard in the early 1990s, when a consortium of cellular carriers across the United States came together for the purpose of creating a method for sending data over cellular telephone channels.
		CDPD technology is able to detect and use these otherwise wasted moments by packaging data in small packets and sending it in short "bursts" during the idle time.
		As a result, the cellular channel operates more efficiently, and voice and data transmissions are unaffected.
	www.arcelect.com /Cellular_Digita_Packet_Data-CDPD.htm (490 words)

	Circuit-Switched Data
		To send data over the cellular network, the only equipment you will need is a data-capable cellular phone, a cellular data modem card and a connecting cable.
		Simply attach the cellular data modem to your laptop computer, and the connecting cable from your modem to your cellular phone.
		Normal cellular airtime and long distance rates apply under the cellular service plan to which you subscribe.
	www.prairiemobile.com /circuit_switched_data.html (119 words)

	Surfing the Web Over Wireless
		Cellular telephone and pager usage is growing at least as fast.
		The number of cellular subscribers in the US increased from 13 to 37 million between 1993 and 1996, tracking an upward exponential curve projected to continue well into the next millennium.
		Data loss and propagation delay over AMPS is high and variable, impeding reliability and reducing effective throughput.
	www.corecom.com /html/wireless.html (2680 words)

	BEST-PRACTICE CASE STUDIES - UPS for Parcel Shipment and Tracking
		Through cellular technology and a broad alliance of more than 70 cellular carriers, package-delivery information is transmitted from the company’s 50,000 vehicles to the UPS mainframe repository in Mahway, NJ, thus enabling UPS to provide same-day package-tracking information for all air and ground packages.
		UPS believes that their circuit-switched cellular data network service is the most comprehensive radio system available today.
		The DVA in turn is connected to a cellular telephone modem (CTM) that transmits information from the UPS vehicle to the cell sites, where it is routed through the carrier’s cellular switch and special primary access equipment.
	www.mobileinfo.com /Case_Study/ups.htm (1314 words)

	Epinions.com - Wireless Technology Survey
		CDMA provides a larger number of users’ data to coexist than time-division methods by applying a code that identifies each individual user and then spreading all of the users’ information across a number of different frequencies.CDMA is also newer than TDMA and GSM and provides faster connection speeds.
		This is sufficient for voice communication, but for passing around data, there needs to be a data protocol layered on top of the physical transport.
		The data will have to be displayed differently depending on the device which receives it.
	www.epinions.com /elec-review-3422-12BF9755-38F8A04B-prod3 (2119 words)

	M2M / Telemetry Cellular CDMA Modem: Land Cellular Corporation Reliable CDMA Products: Evolution to Cellular Technology (Site not responding. Last check: 2007-10-24)
		Antiquated circuit-switched data over analog cellular, or Advanced Mobile Phone System (AMPS), was one of the original wireless data standards in North America and continues to have broad geographic coverage.
		CDMA is a digital technology which significantly improves the capacity and quality of both voice and data communications, and supports a broader range of applications including voice, wireless Internet and multimedia.
		By working closely with its strategic partners, Land Cellular continues to monitor these developments and is ready to adapt to emerging standards as efficiently required.
	www.land-cellular.com /corporate/technology.htm (424 words)

	Introduction to Mobile Data
		This window defines how much data the sending device must keep in temporary memory to enable the retransmission of a packet in the event that a packet is lost in transmission.
		You will learn the different types of systems that can be used for mobile data ranging from simple cellular data connections to mobile telephones to dedicated packet radio communication systems and how the cost of these systems can range from less than a few pennies per gigabyte to over $10 per kilobyte.
		In addition to traditional mobile data systems, wireless system operators are converting their voice, dispatch, and paging systems to two-way mobile data systems.
	www.althosbooks.com /intomoda.html (948 words)

	Reiter's Wireless Data Web Log : (Site not responding. Last check: 2007-10-24)
		I will be discussing these developments next month during Wireless Data University, a day-long tutorial on March 17 in Orlando, Fla., the day before the start of the huge CTIA Wireless 2002 conference and exposition.
		The cellular phone is but one form factor, and it's a rather crummy form for data.
		The cellular and PDA manufacturers are trying hard to create a great wireless voice and data device, but most efforts are turning a silk purse into a sow's ear.
	reiter.weblogger.com /2002/02/21 (1033 words)

	Navox Corporation Provides Cutting-Edge Audio-Band Voice and Data Modems For Telematics Sector
		SVD technology is the company's proprietary method for sending data and voice at the same time over a channel normally used only for voice communication without degrading the audio quality of a cellular call.
		The technology separates the data and voice so the data signal is not heard by either of the parties engaged in the conversation.
		Navox's audio-band voice and data modems allow voice and data to be transmitted between a digital or analog cellular handset and a Public Switched Telephone Network-based (PSTN) call center.
	www.prnewswire.com /cgi-bin/stories.pl?ACCT=104&STORY=/www/story/10-22-2002/0001824796&EDATE= (1030 words)

	product&services / business solutions / mobile computing / analog data services / FAQs - TELUS Mobility - Alberta
		A. Billing is based on the current cellular voice plan that you subscribe to - in other words, you'll be charged for the number of minutes that you use the circuit during your data communications session.
		A. To get the best performance out of cellular circuit switched data, you'll need to use modems which support enhanced error correcting protocols (i.e.
		A. Applications which generate large amounts of data within a single session are most cost-effective using circuit switching.
	www.telusmobility.com /ab/business_solutions/analogdata_faqs.shtml (356 words)

	High Speed Circuit Switched Data
		High Speed Circuit Switched Data (HSCSD) is a new high speed implementation of GSM data techniques.
		HSCSD allows wireless data to be transmitted at 38.4 kilobits per second or even faster over GSM networks by allocating up to eight time slots to a single user.
		Current datacom services over GSM generally allows transferring files or data and sending faxes at 9.6 kbps.
	www.cellular.co.za /hscsd.htm (269 words)

	Circuit Switch Cellular Digital Packet Data
		In the Circuit Switch CDPD system, the use of individual circuits for each mobile means that there is no sharing of the RF channel in use.
		The purpose of the Circuit Switch CDPD Control Protocol is to provide the services necessary to maintain efficient CDPD mobility management function on circuit switched data modem technology.
		After the data link is disconnected due to an extended idle period, it is possible that the network needs to deliver data to the CM-ES.
	www.leapforum.org /published/internetworkMobility/split/node90.html (1740 words)

	Amazon.com: Cellular Digital Packet Data (Artech House Mobile Communications Series): Books: M. Sreetharan,Rajiv Kumar (Site not responding. Last check: 2007-10-24)
		Sreetharan, Rajiv Kumar "Cellular digital packet data (CDPD) is a wireless technology that provides packet-switched data transfer service using the radio equipment and spectrum available in the existing..." (more)
		Cellular digital packet data (CDPD) is a wireless technology that provides packet-switched data transfer service using the radio equipment and spectrum available in the existing analog mobile phone system (AMPS)-based analog cellular networks.
		Wireless Data technologies is a growing field and this book outlines the architecture and protocol to send data over the CDPD infrastructure.
	www.amazon.com /exec/obidos/tg/detail/-/0890067090?v=glance (824 words)

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