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Topic: Cellular digital packet data

	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)

	Cellular digital packet data - Wikipedia, the free encyclopedia
		Cellular Digital Packet Data (CDPD) uses unused bandwidth normally used by AMPS mobile phones between 800 and 900 MHz to transfer data.
		Developed in the early 1990's, CDPD was large on the horizon as a future technology.
		As of July 2005, the former ATandT Wireless CDPD network is no longer active, and Cingular Wireless CDPD customers have been informed that as of the end of the year, it will be down as well.
	en.wikipedia.org /wiki/Cellular_digital_packet_data (166 words)

	Article 1
		The data packets are cleverly interleaved with the existing voice signals on momentarily unoccupied voice frequencies, during idle time in the voice signals.
		CDPD networks can allow a mobile user to transmit data using either cellular channels or existing Circuit Switched telephone channels as shown above, which means that even outside the bounds of the cellular reception area, data transmission can be achieved.
		The data packets are transmitted at speeds of typically 19.2 Kilobits/second to the MDBS, but actual throughput may be as low as 9.6 Kilobits/second due to the extra redundant data that is added to transmitted packets.
	www-dse.doc.ic.ac.uk /~nd/surprise_96/journal/vol1/oi/article1.html (1589 words)

	Cellular Digital Packet Data (Site not responding. Last check: 2007-10-11)
		Placing data, conversations, photographs, and multimedia into binary (digital) form and transmitting the information through a network with a large bandwidth permits more information to be sent more quickly with greater clarity.
		Data sent using CDPD systems is less likely to be "lost" between senders and receivers due to the position of mobile units, weather conditions, or other anomalies.
		CDPD technology, coupled with specialized software and advances in MDT systems, is moving police organizations toward the day when it will be routine to operate as a "paperless" organization.
	www.wsurcpi.org /tech/cdpd.html (2026 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.
		CDPD was introduced by IBM, overlays packet switching onto the existing cellular voice network, and transmits data packet s over the idle capacity.
		CDPD is a packet overlay on the existing cellular network that needs no call s etup or tear down.
	scis.nova.edu /~raciti/cellular.html (5290 words)

	CDPD (Cellular Digital Packet Data) (Linktionary term) (Site not responding. Last check: 2007-10-11)
		CDPD is sometimes called wireless IP, although that term now means much more, as discussed under the "Wireless IP".
		CDPD handles the types of bursty traffic that are common with network-connected users, such as short exchanges of information like electronic mail or database queries.
		Data is sent in packets across a wireless circuit that is shared by other users, or across any channel that is idle.
	www.linktionary.com /c/cdpd.html (171 words)

	Emerson Process Management
		The CDPD transceivers or modems were purchased from the local cellular provider and monthly costs per well site were set up to be charged on data volume as opposed to air time.
		CDPD was designed to minimize the impact on network software by not requiring any changes to the higher network protocols.
		CDPD uses the existing infrastructure -- since the existing cellular network is already established, CDPD does not require the tremendous up-front costs of installing a new physical network.
	www.emersonprocess.com /flow/emerson/success_stories/cdprev.html (3522 words)

	CELLULAR DIGITAL PACKET DATA(CDPD): WHAT MAKES IT RELIABLE?
		The Cellular Digital Packet Data (CDPD) network is a little over one year old and already is proving to be a hot digital enhancement to the existing phone network.
		CDPD transmits digital packet data at 19.2Kbps, using idle times between cellular voice calls on the cellular telephone network.
		Although the raw data rate for CDPD is 19.2 kbps the actual throughput rate is more in the vicinity of 9.6 kbps.
	www-dse.doc.ic.ac.uk /~nd/surprise_96/journal/vol2/vk5/article2.html (1031 words)

	Cellular Digital Packet Data
		Cellular Digital Packet Data (CDPD) is an overlay to the existing D-AMPS cellular network, which enables users to transmit packets of data over the cellular network using a portable computing device and a CDPD modem.
		The MDBS is primarily responsible for radio frequency management, such as making sure the M-ES does not transmit on a frequency that is currently being used by cellular voice, channel hopping, and aiding the M-ES to transfer from one cell to another by assisting in the location of a new channel.
		The Intermediate System is a standard IP router with the primary responsibility of relaying data packets.
	www.cellular.co.za /cdpd.htm (762 words)

	Digital Cellular Article
		Most digital cellular phones marketed in the U.S. also have an analog capability and are often referred to as "dual mode." But phones supporting both TDMA and CDMA are unlikely to appear.
		While the data capabilities of digital cellular networks have attractive technical features, it is unlikely these data capabilities will be broadly available for perhaps three years or more.
		Still, the eventual deployment of high-capacity wireless data services is assured, and as workforce mobility continues to challenge the creativity of network managers everywhere, cellular and PCS carriers are finding that there's much more to their networks than voice.
	www.rysavy.com /Articles/digcell.htm (1821 words)

	RFC 1674 (rfc1674) - A Cellular Industry View of IPng
		Although the capability for mobility is orthogonal to the wired or wireless nature of the data link in use, the rapid deployment wireless technology amplifies the requirement for topological flexibility.
		Data Efficiency The bandwidth of wide area wireless networks is a precious resource, the use of which must be optimized.
		Packet prioritization must also be supported by IPng in order to optimize the use of low speed networks.
	www.faqs.org /rfcs/rfc1674.html (823 words)

	CELLULAR DIGITAL PACKET DATA: THE KEY TO MOBILE DATA FOR THE MASS MARKET? - Computer Business Review
		The standard, Cellular Digital Packet Data, CDPD, was born in April 1992, when IBM Corp, along with a group of cellular carriers, announced a co-operative effort to develop specifications for an open industry standard for transmitting data over cellular communication systems.
		At the heart of Cellular Digital Packet Data is IBM's CelluPlan II technology, which enables idle time on cellular systems to be filled with packets of data, providing a wireless data service with a transmission rate of 19.2Kbps.
		These were then touted round the industry for comment and the Cellular Digital Packet Data project culminated, in August this year, with a published version 1.0 of its full open specification, which was presented to the Cellular Telecommunications Industry Association and the Telecommunications Industry Association for adoption as an open standard.
	www.cbronline.com /article_cg.asp?guid=2489AC8C-0396-491B-AE06-FB6F18F75BC7 (863 words)

	What is CDPD? - a definition from Whatis.com - see also: Cellular Digital Packet Data
		Because CDPD is an open specification that adheres to the layered structure of the Open Systems Interconnection (OSI) model, it has the ability to be extended in the future.
		As data such as e-mail arrives, it is forwarded immediately to the user without a circuit connection having to be established.
		There is a circuit-switched version, called CS CDPD, that can be used where traffic is expected to be heavy enough to warrant a dedicated connection.
	searchnetworking.techtarget.com /sDefinition/0,,sid7_gci213843,00.html (410 words)

	AT&T - McCaw Cellular Merger (Site not responding. Last check: 2007-10-11)
		CDPD is the technology used by McCaw's AirData network to transmit data across cellular networks.
		CDPD is a fast, efficient, digital data transmission system that overlays existing analog cellular networks.
		In the CDPD standard data files and transactions are divided into small packets and sent between voice transmissions on cellular channels.
	fiddle.visc.vt.edu /courses/ee4984/Projects1995/kierschu.html (1470 words)

	Network Computing \| Sneak Preview \| Mobile & Wireless \| Novatel's Minstrel Modem in Harmony with Palm m500 Series PDAs ... (Site not responding. Last check: 2007-10-11)
		CDPD is an IP-capable data network that taps the unused capacity of analog (AMPS [Advanced Mobile Phone Service]) cellular networks in the United States, most commonly over the AT&T Wireless IP network.
		The real-world throughput I encountered when testing e-mail and data file transfers was 1,700 bps to 2,600 bps, which is in line with similar tests Network Computing ran last year with an earlier version of the Minstrel CDPD modem.
		This data rate is adequate for reading small e-mail messages and doing minimal data transfer, but it is painfully slow for uploading and downloading substantial amounts of data.
	www.networkcomputing.com /1217/1217sp3.html (1084 words)

	Utah HP Detailed Report (Site not responding. Last check: 2007-10-11)
		Cellular Digital Packet Data gives the trooper access to vehicle registrations, driver license information, warrants, the Utah Law Enforcement Information Network, and federal information systems in their vehicle.
		CDPD is proving to be an effective alternative to an 800 megahertz system and is a great example of a public / private partnership that is working effectively.
		The CDPD unit and computer system will not lessen the load on the dispatch center, but it will make the trooper in the field more effective by providing him/her the tools to directly investigate a suspect and their background.
	www.iacptechnology.org /Programs/UtahSpt.html (3603 words)

	cellular data (Site not responding. Last check: 2007-10-11)
		You need to purchase and install a card cellular data that is a radio transceiver designed to work on one of the cellular data network standards.
		Cellular, provider of M2M CDMA cellular modems, cellular routers and cellular wire-line backup devices, have announced the CDM-819s- Serial cellular data Data Modem, and.
		The module is intended for the cellular band in CDMA wireless handsets and data cards using the Qualcomm single chip family of devices.
	www.cellular-vortex.com /detail/cellular+data.htm (538 words)

	Privateline.com: Packet and circuit switching
		Other packets from other calls race upon these circuits as well, making the most use of each track or path, quite unlike the circuit switched calls that occupy a single single path to the exclusion of all others.
		Packets can arrive out of sequence or be delayed and then be reassembled at the other end.
		Packet Video is promising video clips at 60Kbs over conventional circuit switched cellular radio channels, indeed, they say they are platform independent, that is, their technology will work over whatever radio technology a carrier is using.
	www.privateline.com /Switching/packet.html (2658 words)

	Mobile Phone News: … CDPD: the age of discovery - cellular digital packet data - CDPD Equipment Deployment - ...
		Mierisch explains the MDBS is analogous to the cellular network's mobile base station and the MDIS is similar to the cellular switch and controller, A MDBS handles such tasks as sending and receiving data packets to and from the modems of various subscribers using the data services.
		Although the price to deploy CDPD equipment remains configuration dependent--a complete CDPD overlay's typical ballpark cost per cell, including a pro-rated portion of MDIS and software, would be somewhere around $50.000 to $75,000 per cell.
		Initially, major CDPD deployment will be in the major cities, but the lowly interstates will need to be covered, said Sellinger.
	www.findarticles.com /p/articles/mi_m3457/is_n46_v11/ai_14791297 (774 words)

	SAMSUNG's Digital World - Press Release
		It has the capability to access analog or digital systems (the same feature as current cellular phones) and can use the 1.9 G Hz radio frequency, which has been reserved in the US for personal communications services.
		CDPD refers to a service for tranmitting non-audio data in packet units over a cellular network.
		Adding CDPD services to existing cellular networks allows users to receive large quantities of digital data via wireless terminals.
	www.samsung.com /au/presscenter/pressrelease/global_pressrelease.asp?seq=19960920_0000000389 (819 words)

	CDPD (Cellular Digital Packet Data) - NetLingo The Internet Dictionary: Online Dictionary of Computer and Internet ...
		A packet data protocol standard for sending wireless data, it was developed for use on cellular phone frequencies.
		It transmits data in packets on unused cellular channels (in the 800MHz to 900 MHz range).
		Basically, CDPD is a way to send and receive information over wireless devices.
	www.netlingo.com /lookup.cfm?term=CDPD%20%20%28Cellular%20Digital%20Packet%20Data%29 (164 words)

	Re: [ns] Cellular Digital Packet Data (Site not responding. Last check: 2007-10-11)
		> Hi all, > I would like to know whether a "Cellular Digital Packet Data > (CDPD)" environment can be simulated using ns.
		Maybe, you should start by looking at the mobile IP and ad hoc networking simulations (Chapter 15 in the ns manual).
		Prev by thread: [ns] Cellular Digital Packet Data
	www.isi.edu /nsnam/archive/ns-users/webarch/2000/msg04446.html (119 words)

	Digital CDMA 1xRTT GSM GPRS Wireless Data Cell cellular modem
		Cellular telephone and modem providers that offer CDPD support make it possible for mobile users to get access to the Internet at up to 19.2 Kbps.
		Because CDPD is an open specification that adheres to the layered structure of the Open Systems Interconnection (OSI) model, it has the ability to be extended in the future.
		As data such as e-mail arrives, it is forwarded immediately to the user without a circuit connection having to be established.
	www.arcelect.com /Digital_CDMA-1xRTT_Wireless_Data_Cell-Cellular_modem.htm (495 words)

	Cellular Digital Packet Data (CDPD) - Cell Phone Glossary - Mobiledia
		Cellular Digital Packet Data (CDPD) - An enhanced packet overlay on analog cell phone networks used to transmit and receive data.
		This technology allows data files to be broken into a number of packets and sent along idle channels of existing cellular voice networks.
		CDPD provides 19.2 Kbps and is deployed by AT&T among several other carriers.
	www.mobiledia.com /glossary/62.html (107 words)

	Powell's Books - Cellular Digital Packet Data (Artech House Mobile Communications) by Muthutha Sreetharan
		A technical reference for an emerging wireless technology for mobile data communications, which uses the spare channel capacity of an existing advanced mobile phone system infrastructure, and is one of the platforms vying to deal the with increasingly crowded flow of wireless data.
		Presents an introduction and overview to cellular digital packet data and both the alternative and the interfacing technologies, then describes the architecture, subsystems, details of the main components, network management, configuration, security, performance, and other aspects.
		Whether you're searching for the technical details of CDPD network operations, or you need a better understanding of the options available to you when choosing a wireless data transfer technology, this book provides the background you need.
	www.powells.com /biblio?show=HARDCOVER:USED:0890067090:20.00 (206 words)

	What is CDPD (Cellular Digital Packet Data)? (Site not responding. Last check: 2007-10-11)
		CDPD (Cellular Digital Packet Data) is a specification for supporting wireless access to the Internet and other public packet-switched networks over cellular telephone networks.
		CDPD utilizes the RC4 stream cipher with 40 bit keys for encryption.
		CDPD modems are manufactured by companies such as Sierra Wireless, Novatel, and AirCard.
	www.tech-faq.com /cdpd-cellular-digital-packet-data.shtml (216 words)

	Wireless and Mobile Computing (Site not responding. Last check: 2007-10-11)
		For others, such as analyzing seismic data, it may be acceptable to have some delay between the time the data is requested and the time it is received.
		A way of organizing data for transmission to break larger data streams up into smaller bundles that are pieced back together by the recipient based on header, text, and trailer information in each packet.
		Packet based networks are typically "always on" and do not require the user to initiate a dial-in to connect to the server.
	www.dir.state.tx.us /pubs/wireless/wireless.htm (6142 words)

	Modeling the Sleep Mode for Cellular Digital Packet Data (Site not responding. Last check: 2007-10-11)
		Cellular digital packet data (CDPD) utilizes sleep mode mechanism to conserve the power of mobile end systems (M-ES's).
		When the power consumption budget is determined in a CDPD system design, our study provides guidelines to determine the timer values as well as the buffer size to optimize the frame transmission performance.
		CDPD Forum, "Cellular digital packet data system specification: Release 1.1," CDPD Forum, Inc., Tech.
	www.comsoc.org /comml/private/1999/mar/63_03comml03-lin.html (261 words)

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