Figure 6-6 RIM server redirection in C#

Decode UPC A in C# Figure 6-6 RIM server redirection

Figure 6-6 RIM server redirection
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Internet Mobile Network Mail Server with Blackberry Server Software Firewall RIM Handheld
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Part 2 Wireless Technologies and Applications
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This means that Blackberry services will continue in popularity and offer a compelling solution for wireless e-mail and messaging
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Mobitex Versus CDPD What Does the Future Hold
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Like CDPD networks, Mobitex networks find themselves competing with faster data alternatives However, although Mobitex usage will probably wane in the coming years as users migrate to faster services, Mobitex will probably still outlast CDPD for the following reasons:
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Network infrastructure One of CDPD s biggest benefits is that it is designed to operate on the existing AMPS cellular infrastructure, making the network inexpensive to build By contrast, Mobitex networks require an entirely new infrastructure and hardware, making them more expensive The initial cost savings are now working against CDPD because the network operators are looking to eliminate AMPS hardware to reduce support costs and migrate toward a 100 percent digital infrastructure This makes it increasingly difficult for operators to justify the maintenance of the CDPD network Because Mobitex networks require a greater initial investment, Mobitex network operators have been highly motivated to keep the networks operational Strong industry association CDPD was pioneered by the Baby Bells in the United States In recent years, there has been considerable consolidation among the Baby Bells Nynex and Bell Atlantic merged to form Verizon and Ameritech merged with Southwestern Bell among others This fragmentation has made some carriers deemphasize wireless data services like CDPD In contrast, the Mobitex Operators Association (MOA) is led by Ericsson with active participants representing the major components of Mobitex This consistent strong association has helped Mobitex collectively position themselves against new technologies Greater coverage Mobitex has achieved greater critical mass in terms of users and has geographic coverage beyond the United States This has opened up the possibility of global roaming This larger market also makes Mobitex attractive to service providers and equipment vendors because they have a large market to service and sell to
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Regardless of the final outcome of these various wireless data technologies, they have all helped to validate the wireless data market Ironi-
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6 Introduction to Wireless Data Networks
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cally, the wireless data market, which emerged exclusively to service certain vertical markets like healthcare and law enforcement, will likely evolve back to serving those niche markets again as the mainstream public moves toward faster wireless data network standards
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General Packet Radio Service (GPRS)
Although second-generation (2G) GSM networks successfully offered high-quality wireless voice services, GSM networks were not optimized for high-speed data Instead, 2G GSM networks were entirely circuit switched, meaning that wireless data was slow (less than or equal to 144 Kbps) and expensive As operators sought to offer more value-added services like wireless data, they quickly realized that faster throughput was a key requirement Furthermore, the operators wanted a method that could add high-speed data without requiring massive capital investment or changes to the network In the late 1990s, GSM operators developed a new specification for highspeed wireless data called General Packet Radio Service (GPRS) As its name implies, GPRS is packet based, as opposed to GSM s circuit-switched architecture Packet-based switching provides some significant advantages:
Compatibility with the Internet Because the Internet is a packet-based network utilizing the IP, GPRS provides an easy connection with Internet-based data This makes GPRS ideally suited for wireless data and applications Always-on connection Packet switching does not require that a physical link (such as a circuit) be opened for data transfer This enables GPRS users to receive information only when they need to, but more importantly, it does not require that a circuit-switched connection be established for every individual call Efficient networks Packet switching enables data packets to be redirected over the optimal network path and bypass potential network bottlenecks Furthermore, packet switching means that the radio spectrum is only used during the transmit or receive mode This enables multiple users to share the same spectrum in a given area In circuit switching, a dedicated circuit must be opened for each call, preventing multiple users from using the same frequency in a cell site
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