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providers (ISP) and corporate Intranet are needed for voice and data IP gateways. Mobile users drive the<br />

development of wireless and satellite devices. In addition, there is an increasing demand for routers/switches,<br />

DSL modems, etc.<br />

All needs mentioned above require smaller size and faster communication devices. Telephone calls<br />

that used to last an average of three minutes now exceed an hour or more when connected to the Internet.<br />

This has resulted in increasing the demand on DSL that transmit data over Internet protocols (IP) such<br />

as voice-over-IP (VoIP), mobile-over-IP (MoIP), and wireless requires speeds that may be unattainable<br />

with separate IC products. Examples of products:<br />

1. 2G and 3G wireless devices (CDMA2000, WCDMA), etc.<br />

2. DSL modems<br />

3. Infrastructure, carrier, and enterprise circuit, packet switched and VoIP devices<br />

4. Satellite modems<br />

5. Cable modems and HFC routing devices<br />

6. De/MUX for data stream on optical network<br />

7. Web browsers (WAP) or short messaging systems (I-mode)<br />

8. LAN telephony<br />

9. ATM systems<br />

10. Enterprise, edge network and media-over-IP switches and high-speed routers<br />

11. Wireless LAN (IEEE 802.11 IEEE 802.11a, and IEEE 802.11b)<br />

12. Bluetooth<br />

Maybe the most important example of an emerging wireless communication standard is Bluetooth. This<br />

is a wireless personal area network (PAN) technology from the Bluetooth special interest group (SIG),<br />

founded in 1998 by Ericsson, IBM, Intel, Nokia, 3Com, Lucent, Microsoft, Motorola, and Toshiba. Bluetooth<br />

is an open standard for short-range transmission of digital voice and data between mobile devices (cellular<br />

phones, PDAs, laptops) and desktop devices. Bluetooth may provide a common standard to enable PDAs,<br />

laptop and desktop computers, cellular phones, thermostats, and virtually every other home and business<br />

electronic device to communicate with each other. Manufacturers will rely on SoC advances to help reach<br />

the target of $5 added cost to a consumer appliance by 2001. A study by Merrill Lynch projected that Bluetooth<br />

semiconductor revenue will reach $3.4 billion in 2005, with Bluetooth included in 1.7 billion devices that<br />

year, and the Bluetooth SIG estimated that the technology would be a standard feature in 100 million mobile<br />

phones by the end of 2001.<br />

Communication SoCs<br />

The exponential growth of the Internet and the bandwidth shown in Fig. 42.11, indicate that more<br />

communication products are geared towards this technology, which requires a communication mode<br />

different than that used in traditional switching telephony. For example, in a PSTN, circuit switching is<br />

used and requires a dedicated physical circuit through the network during the life of a telephone session.<br />

In Internet and ATM technology, however, packet switching is used. Packet switching is a connectionless<br />

technology, where a message is broken into several small packets to be sent to a destination. The packet<br />

header contains the destination and source address, plus a sequence number so that the message can be<br />

reassembled.<br />

There is a paradigm shift in digital communication motivated by the evolution of Internet as mission<br />

critical service that demands migration from circuit switch to packet switch. The older paradigm supported<br />

the data traffic part of the telephone networks. Whereas the new paradigm support the convergence<br />

of voice, data, and video and require a new class of media-over-IP systems voice traffic as part of the<br />

data network, thus requiring communication SoC for VoIP.<br />

Most communication SoC consists of few components that are clustered around a central processing<br />

unit (CPU), which controls some or all of the following: (1) Packet processing, (2) Programmable DSP<br />

for data and signaling algorithm/protocol implementation, (3) I/O for interface with voice and data network<br />

such as ATM, PCI, Ethernet, H100/110, (4) memory system for intermediate storage of voice and data<br />

© 2002 by CRC Press LLC

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