Monday, September 8, 2008
Introduction to Client Server Networks
The term client-server refers to a popular model for computer networking that uses client and server devices each designed for specific purposes. The client-server model can be used on the Internet as well as local area networks (LANs).
Monday, July 21, 2008
Future of 4G Technologies Emerging
According to In-Stat reports, the primary 4G technologies are expected to be Long-Term Evolution, Ultra-Mobile Broadband and IEEE 802.16m WiMax. The International Telecommunication Union is expected to release an official definition of wireless 4G technology in 2008 or 2009.
Sophos Strengthens Next-Generation Web Security with WS1000
IT security and control firm Sophos today announced the latest version of its WS1000 web appliance, which brings together enterprise-grade policy and URL filtering with trusted real-time security filtering–all managed on one easy-to-use platform. The new Sophos solution enables businesses to effectively protect against growing web threats at the gateway, which are not adequately protected by current market offerings. The WS1000 also offers network administrators improved oversight and reporting of web browsing behaviors in their organization.
Sprint Nextel Plans $5 Billion for 4G Wireless Broadband Network
Sprint Nextel has indicated that it expects to spend more than $5 billion to build a nationwide 4G wireless broadband network. The carrier will market the services associated with the new network under the name Xohm.
Linksys Dual-Band Wireless-N Gigabit Router
The Dual-Band Wireless-N Gigabit Router is really four devices in one box. First, there's the dual-band Wireless Access Point, which lets you connect to the network without wires. There's also a built-in 4-port full-duplex 10/100/1000 Switch to connect your wired-Ethernet devices together at up to gigabit speeds. The Router function ties it all together and lets your whole network share a high-speed cable or DSL Internet connection
Thursday, July 17, 2008
Smart Network Devices (SND) unveiled the world's smallest autonomous network camera at Embedded World 2003 in Nurnberg.
Smart Network Devices (SND) unveiled the world's smallest autonomous network camera at Embedded World 2003 in Nurnberg Measuring only 3 x 6 x 2cm and with an estimated material cost of under Eur 70.00 it sets new standards in network-supported security and video-surveillance technology
Connecting either to Ethernet or directly to the Internet, it carries out image compression at a speed capable of supporting M-JPEG at between 5 and 10frame/s.
The camera is a reference design, based on the SND Micro WebTarget board.
It uses the newest CMOS image-sensor technology and a Hyperstone 32bit RISC/DSP CPU for image compression.
Data from the sensor passes through a buffer unit to the CPU, where it is compressed into JPEG-format and then made available to the network through a 100Mbit/s Ethernet interface.
The small size and the low costs come from the minimising the system's hardware components.
The CMOS image sensor produces digital data, eliminating costly and expensive conversion of an analogue video signal.
The image sensor automatically handles the primary image processing (colour filter, automatic white balance, adaptive sensitivity according to light conditions, Gamma correction etc) so that downstream image processors are unnecessary.
Image compression into JPEG-format is through software.
The image acquisition and compression is under the control of SND's HyNetOS embedded network operating system.
This provides all necessary drivers (CMOS-sensor, Ethernet) and communication protocols (TCP/IP, HTTP, FTP) as well as a file system for plug-in to random networks or directly to the Internet.
A wireless variant of the network camera module, based on SND's Micro BlueTarget Bluetooth board, is planned for the 2nd quarter of 2003.
The corresponding Bluetooth-protocol-stack for HyNetOS is available now.
The network camera reference design is available now as an evaluation kit, complete with full hardware schematics for volume manufacturing.
The HyNetOS is available under license.
• Smart Network Devices: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Connecting either to Ethernet or directly to the Internet, it carries out image compression at a speed capable of supporting M-JPEG at between 5 and 10frame/s.
The camera is a reference design, based on the SND Micro WebTarget board.
It uses the newest CMOS image-sensor technology and a Hyperstone 32bit RISC/DSP CPU for image compression.
Data from the sensor passes through a buffer unit to the CPU, where it is compressed into JPEG-format and then made available to the network through a 100Mbit/s Ethernet interface.
The small size and the low costs come from the minimising the system's hardware components.
The CMOS image sensor produces digital data, eliminating costly and expensive conversion of an analogue video signal.
The image sensor automatically handles the primary image processing (colour filter, automatic white balance, adaptive sensitivity according to light conditions, Gamma correction etc) so that downstream image processors are unnecessary.
Image compression into JPEG-format is through software.
The image acquisition and compression is under the control of SND's HyNetOS embedded network operating system.
This provides all necessary drivers (CMOS-sensor, Ethernet) and communication protocols (TCP/IP, HTTP, FTP) as well as a file system for plug-in to random networks or directly to the Internet.
A wireless variant of the network camera module, based on SND's Micro BlueTarget Bluetooth board, is planned for the 2nd quarter of 2003.
The corresponding Bluetooth-protocol-stack for HyNetOS is available now.
The network camera reference design is available now as an evaluation kit, complete with full hardware schematics for volume manufacturing.
The HyNetOS is available under license.
• Smart Network Devices: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Other hardware for establishing networks or dial-up connections
Other hardware for establishing networks or dial-up connections:
Multiplexer: device that combines several electrical signals into a single signal
Network Card: a piece of computer hardware to allow the attached computer to communicate by network
Modem: device that modulates an analog "carrier" signal (such as sound), to encode digital information, and that also demodulates such a carrier signal to decode the transmitted information, as a computer communicating with another computer over the telephone network
ISDN terminal adapter (TA): a specialized gateway for ISDN
Line Driver: a device to increase transmission distance by amplifying the signal. Base-band networks only.
Multiplexer: device that combines several electrical signals into a single signal
Network Card: a piece of computer hardware to allow the attached computer to communicate by network
Modem: device that modulates an analog "carrier" signal (such as sound), to encode digital information, and that also demodulates such a carrier signal to decode the transmitted information, as a computer communicating with another computer over the telephone network
ISDN terminal adapter (TA): a specialized gateway for ISDN
Line Driver: a device to increase transmission distance by amplifying the signal. Base-band networks only.
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