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infrastructure, a two-way paging protocol offering varying inbound and outbound channel speeds (up to 192 Kbps), support for alphanumeric paging, frequency reuse, guaranteed message delivery and response, among many enhanced services REFLEX and inFLEXion (voice paging protocols) are rapidly replacing the old POCSAG standard in North America, and paging devices are now used actively in overthe-air wireless telemetry applications, among them utility meter reading, automobile paging systems, industrial controls, automated vending machine inventory control, crime fighting and monitoring devices, and digital image transfer
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The First Wireless Data Networks
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Concurrent with paging developments, telecom giants began developing data only wide area specialized networks for mobile users In 1985 the Swedish giant Ericsson launched its mobile packet network, Mobitex, in Europe; and Motorola and IBM invented a comparable standard, DataTAC, for wireless data services in the US and abroad Further, standards were promulgated for Short Messaging System (SMS), a protocol used primarily for two-way dispatch networks aimed at fleets of vehicles and now used by practically anyone who has a mobile phone in Europe to send and receive short messages These specialized networks appealed principally to business and vertical markets, employing handheld or vehicle-mounted wireless terminals, custom middleware, and specialized applications The networking technology took advantage of wireless packet" or always on transmissions similar to X25 (a common wireline packet protocol) Packet switching means the networks do not depend, as circuit-switched networks do, on securing an open channel or reserving it for the exclusive use of the sender Rather, each packet of data is individually addressed and routed to its final destination, increasing network efficiency and lowering cost (see 7 on Wireless Networks" to learn more about packet vs circuit-switched technology) By contrast, circuit-switched data, the most common form of data in current voice cellular systems (eg, CDMA or Time Division Multiple Access [TDMA] networks), assigns each data transmission to individual radio frequencies These systems reserve frequency or time slots for an individual transmission and don t allow multiple users to contend for spectrum once it is allocated Why are these distinctions important Wireless networks have to deliver data efficiently, with high performance and comparatively low cost Early investments in wireless data services had to be justified mostly by return on invest-
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ment (ROI) based on tangible and some intangible benefits One of those benefits was transmitting data over the air on an anytime, anywhere basis Packet networks, in particular, offered mobile users a new level of wireless over the air" performance especially for limited (narrowband) mobility applications, such as dispatch and field service Ericsson s Mobitex network, for example, could oper-
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ate at 8 Kbps, with latencies of no more than 10 seconds, which was deemed acceptable for many commercial applications Motorola and IBM, meanwhile, began collaborating on a separate optimized data technology, DataTAC, for IBM s mobile field force The original technology (called MDC) operated at 48 Kbps; IBM installed a network linking 20,000 field service employees using MDC and a communications device that was large and bulky, which earned it the nickname of the brick Eventually, Mobitex in the US became RAM Mobile Data, which spread nationally in 1993, and was eventually absorbed by BellSouth as BellSouth Wireless Data (now Cingular Interactive) At roughly the same interval, IBM and Motorola s DataTAC was transformed into a competing, nationwide wireless data network, called Advanced Radio Data Information System (ARDIS) IBM s field force first used ARDIS for dynamic dispatch, parts ordering, entitlement checks, and technical assistance from repair centers Ultimately, ARDIS became the chief network for American Mobile Satellite Corp (renamed Motient in 2000), deployed throughout North America to major corporate accounts, among them United Parcel Service Both RAM and ARDIS set basic standards for nationwide mobile data coverage that have yet to be surpassed
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