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Design Concepts of Uninterruptible Power Supplies

The design of the Uninterruptible Power Supply is determined to a large extent by the required function and what level of critical cover is expected to protect the load .

At the bottom end of the scale are ‘ Desk Tops’ the Offline UPS system , generally below 1kVA, as its name suggests it provides an unregulated filtered supply to the load at the same time maintaining the state of charge of the battery by a separate charger.

When the utility mains fails or goes out of tolerance the inverter turns on and is connected to the load via a relay. There is a short break while this operation takes place and the duration of this break is called the transfer time.

The Offline UPS system is not suitable where there are large variations in the local utility mains supply, as the load will be directly affected. To overcome this problem a Line Interactive UPS system can be used, the technology operates in a very similar way to the Offline UPS systems whereas the inverter does not provide supply to the load unless a utility mains failure or brownout has occurred.

The Line Interactive UPS system uses an active voltage regulator (AVR) to control the voltage seen by the load during normal operation; this method insures that the load has a constant voltage applied to it. Again these Uninterruptible Power Supplies are more suitable for smaller office environment loads and generally are restricted to a maximum of 10kVA.

Traditionally for larger load requirements the Double Conversion UPS system has been favoured, basically it consists of a rectifier, battery, inverter and static switch. This is generally termed- True On-line UPS -

The term ‘True On-Line’ is used because this type of UPS will really protect your mission critical equipment to the point that if you remove its power source and then re-instigate the power , there will be no effect on your equipment.

How is it work then? The True On-Line Uninterruptible power supply works by having a rectifier, which converts the utility mains ac supply to dc, has the dual function of providing a dc supply for the inverter and also a supply to recharge the battery. Therefore in the event of the utility mains failing or going out of tolerance due to voltage or frequency causing the rectifier to switch off the battery will seamlessly continue to provide the dc supply for the inverter.

The inverter then converts the dc supply back to an ac supply that is voltage and frequency controlled to supply the load. The load is therefore completely protected from any surges, spikes or sags from the utility mains supply.

The double conversion Uninterruptible Power Supply has the added advantage of what is generally called the static switch; this is an electronic changeover power switch, which selects the supply required for the load. The supply can be either the unprotected utility mains supply or the fully protected inverter supply. This feature can be very useful in the event of an overload occurring, which is beyond the rating of the inverter, the load will be automatically transferred without loss to the utility mains supply, transferring back to the protected inverter supply when the fault has been removed.

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4 Port USB 2.0 VGA HDDB KVM Switch Box MT-471UK $60.69 If you want to connect multiple computers together, you need a KVM switch. KVM stands for keyboard-mouse-video. You plug one monitor, mouse and keyboard into a KVM switch, and then you can run multiple computers from a single console with a KVM switch. What we have here is the MT-471UK 4 port USB 2.0 KVM switch box, which will help you to control 4 computers easily.The 4 port USB KVM switch is the simplest way to simultaneously run and share audio among four computers with a single USB keyboard, monitor and USB mouse. 4 port USB 2.0 KVM keyboard monitor VGA HDDB switch box allows you to easily network and share internet connectivity among connected computers while reducing the number of outlets and cables needed in the area – helping to preserve valuable work space. This KVM switch features the unique USB sniffing technology for USB mouse and keyboard emulation to ensure smooth operation. Designed in a compact size, this KVM switch is easy to use and store.This 4 port KVM switch can save you money, time, space, equipment and power. Controlling multiple PCs from one keyboard, mouse and VGA monitor. 4 port KVM switch is loaded with features such as hot-key, front panel push button and auto scan control. It has complete keyboard and mouse emulation for simultaneous PCs boot-up process. With this KVM switch, you can shift control from one computer to another easily instead of pile of lines. Just take this 4 port KVM switch home and you will be surprised by its great function.

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A1000+ Android2.2 4.2Inch WIFI Quad Band Dual Card Dual Standby GPS TV Function Dual Camera Flash Light Touch Screen Bar Cell Phone（2GB TF Card） $137.99 Specifications:Internal Memory: 693KSupport Extend Card: 16G Display Size: 2.8 Frequency Range: 850/900/1800/1900MHz Screen Resolution: QVGA(240 x 320 pixels) Screen Type: TFT Display Color: 256K Ringtones Type: Polyphonic/MP3 Audio File Format: MP3/WAV/AMR/AWB Video File Format: 3GP/MPEG4 (AVI) Image File Format: JPEG/GIF E-book Format: TXT FM Radio: Yes Data Transfer: USB/Bluetooth GPRS: Yes Mobile internet: WAP Camera Pictrue Resolution: 1600×1200/1280×1024/320×240/640×480/240×320/160×120 Stand-by Time: Up to 400 hours Talk Time: Up to 4 hours Power Charger: USB/Travel Charger Input: HandwriteLanguages: English,French,Spanish,Portuguese,Italian,Bahasa Melayu,Bahasa Indonesia,Dutch,Russian,Turkce,Vietnamese,German,Arabic,GreekPhone Book: 500 Entries Messaging: SMS/MMS Dimensions: 100 x 56 x 12mm / 3.94 x 2.20 x 0.47in(L x W x H) Features:Dual SIM – This Cell phone comes with Dual SIM technology, allowing you to switch easily between two SIM cards/phone numbers without having to physically take them out and swap them over-saving you time and hassleFM Radio – A built-in FM tuner lets you tune into your favorite radio station wherever you are – great for chilling out and relaxing to some music whenever you feel like taking a break from the daily grindBluetooth – Another feature of this great cell phone is its Bluetooth capability. Bluetooth allows the phone to communicate without devices, such as hands free headsets, wirelessly-a great solution for people constantly on the move. It also provides a safe and easy way to have a phone conversation while drivingTV-Enabled – Want to catch your favorite TV show while you’re out and about, or your team is playing and you’re nowhere near home? Not to worry, a powerful built-in analogue antenna will pick up all your favorite analogue TV channels for freeDual Camera – Front and rear lenses for a more versatile shotAndroid – Android operating system with deep integration of Google services and access to thousands of apps to …

A1000+ Android2.2 4.2Inch WIFI Quad Band Dual Card Dual Standby GPS TV Function Dual Camera Flash Light Touch Screen Bar Cell Phone（2GB TF Card） $137.99 Specifications:Internal Memory: 693KSupport Extend Card: 16G Display Size: 2.8 Frequency Range: 850/900/1800/1900MHz Screen Resolution: QVGA(240 x 320 pixels) Screen Type: TFT Display Color: 256K Ringtones Type: Polyphonic/MP3 Audio File Format: MP3/WAV/AMR/AWB Video File Format: 3GP/MPEG4 (AVI) Image File Format: JPEG/GIF E-book Format: TXT FM Radio: Yes Data Transfer: USB/Bluetooth GPRS: Yes Mobile internet: WAP Camera Pictrue Resolution: 1600×1200/1280×1024/320×240/640×480/240×320/160×120 Stand-by Time: Up to 400 hours Talk Time: Up to 4 hours Power Charger: USB/Travel Charger Input: HandwriteLanguages: English,French,Spanish,Portuguese,Italian,Bahasa Melayu,Bahasa Indonesia,Dutch,Russian,Turkce,Vietnamese,German,Arabic,GreekPhone Book: 500 Entries Messaging: SMS/MMS Dimensions: 100 x 56 x 12mm / 3.94 x 2.20 x 0.47in(L x W x H) Features:Dual SIM – This Cell phone comes with Dual SIM technology, allowing you to switch easily between two SIM cards/phone numbers without having to physically take them out and swap them over-saving you time and hassleFM Radio – A built-in FM tuner lets you tune into your favorite radio station wherever you are – great for chilling out and relaxing to some music whenever you feel like taking a break from the daily grindBluetooth – Another feature of this great cell phone is its Bluetooth capability. Bluetooth allows the phone to communicate without devices, such as hands free headsets, wirelessly-a great solution for people constantly on the move. It also provides a safe and easy way to have a phone conversation while drivingTV-Enabled – Want to catch your favorite TV show while you’re out and about, or your team is playing and you’re nowhere near home? Not to worry, a powerful built-in analogue antenna will pick up all your favorite analogue TV channels for freeDual Camera – Front and rear lenses for a more versatile shotAndroid – Android operating system with deep integration of Google services and access to thousands of apps to …

A1000+ Android2.2 4.2Inch WIFI Quad Band Dual Card Dual Standby GPS TV Function Dual Camera Flash Light Touch Screen Bar Cell Phone（2GB TF Card） $137.99 Specifications:Internal Memory: 693KSupport Extend Card: 16G Display Size: 2.8 Frequency Range: 850/900/1800/1900MHz Screen Resolution: QVGA(240 x 320 pixels) Screen Type: TFT Display Color: 256K Ringtones Type: Polyphonic/MP3 Audio File Format: MP3/WAV/AMR/AWB Video File Format: 3GP/MPEG4 (AVI) Image File Format: JPEG/GIF E-book Format: TXT FM Radio: Yes Data Transfer: USB/Bluetooth GPRS: Yes Mobile internet: WAP Camera Pictrue Resolution: 1600×1200/1280×1024/320×240/640×480/240×320/160×120 Stand-by Time: Up to 400 hours Talk Time: Up to 4 hours Power Charger: USB/Travel Charger Input: HandwriteLanguages: English,French,Spanish,Portuguese,Italian,Bahasa Melayu,Bahasa Indonesia,Dutch,Russian,Turkce,Vietnamese,German,Arabic,GreekPhone Book: 500 Entries Messaging: SMS/MMS Dimensions: 100 x 56 x 12mm / 3.94 x 2.20 x 0.47in(L x W x H) Features:Dual SIM – This Cell phone comes with Dual SIM technology, allowing you to switch easily between two SIM cards/phone numbers without having to physically take them out and swap them over-saving you time and hassleFM Radio – A built-in FM tuner lets you tune into your favorite radio station wherever you are – great for chilling out and relaxing to some music whenever you feel like taking a break from the daily grindBluetooth – Another feature of this great cell phone is its Bluetooth capability. Bluetooth allows the phone to communicate without devices, such as hands free headsets, wirelessly-a great solution for people constantly on the move. It also provides a safe and easy way to have a phone conversation while drivingTV-Enabled – Want to catch your favorite TV show while you’re out and about, or your team is playing and you’re nowhere near home? Not to worry, a powerful built-in analogue antenna will pick up all your favorite analogue TV channels for freeDual Camera – Front and rear lenses for a more versatile shotAndroid – Android operating system with deep integration of Google services and access to thousands of apps to …

Adtran Atlas 890 Gateway – 1 x 10/100Base-TX LAN $9782 The ATLAS 890 is the newest member of the ATLAS 800 Series product line and is a high-density, modular platform that provides complete system redundancy. With the ATLAS 890, voice, data, video, and Internet applications are all supported in a modular platform that includes both logic and power supply redundancy. The ATLAS 890 chassis includes a high-speed, multi-protocol backplane and modular expansion slots that support all the 800 Series option modules. The fully redundant ATLAS 890 AC version provides 13 options slots. These hot swappable, industry standard modules are available to effectively converge your telecommunications and existing network systems such as routers, PBX, key systems, videoconferencing equipment and remote access servers. The ATLAS 890 performs the functions found in multiplexers, channel banks, 1/0 and 3/1/0 cross connect switches, Frame Relay access devices/concentrators/switches, IP routers, and ISDN switches all in a fully redundant platform. It also includes an integral voice switchboard and dial plan to dynamically and intelligently switch voice and data calls based on the telephone number dialed.

Adtran NetVanta 1335 Multi-Service Access Router with PoE – 1 x SFP – 2 x 10/100/1000Base-T LAN, 24 x 10/100Base-TX LAN $2395 The NetVanta 1335 Multi-Service Access Router is a performance-enhanced platform that addresses the need of multiple networking devices in a single compact platform. The NetVanta 1335 integrates a modular IP access router, 24-port Layer 3 Power over Ethernet (PoE) switch, firewall, VPN appliance, and DSU/CSU, all in one platform. In addition, the NetVanta 1335, injected with Rapid-Route technology, delivers enhanced performance necessary for IP telephony, corporate connectivity and Internet access, even with advanced services enabled.

Adtran NetVanta 1335 Multi-Service Access Router with PoE – 1 x SFP – 2 x 10/100/1000Base-T LAN, 24 x 10/100Base-TX LAN $2467.32 The NetVanta 1335 Multi-Service Access Router is a performance-enhanced platform that addresses the need of multiple networking devices in a single compact platform. The NetVanta 1335 integrates a modular IP access router, 24-port Layer 3 Power over Ethernet (PoE) switch, firewall, VPN appliance, and DSU/CSU, all in one platform. In addition, the NetVanta 1335, injected with Rapid-Route technology, delivers enhanced performance necessary for IP telephony, corporate connectivity and Internet access, even with advanced services enabled.

Adtran NetVanta 6355 Multiservice Access Gateway – 2 x FXS, 2 x FXO, 1 x 10/100Base-TX WAN, 24 x 10/100Base-TX PoE LAN, 2 x 10/100/1000Base-T Uplink $1977 The NetVanta 6355 Multiservice Access Gateway is a unique, all in one solution for Hosted VoIP PBX services, Internet access, and business connectivity. This powerful platform combines the voice functionality of Adtran’s industry leading Total Access 900e Multiservice Access Device and the widely deployed NetVanta Power over Ethernet (PoE) Switch-Router into a compact 1U chassis. This all-in-one product includes a robust SIP-Gateway, a full-featured IP router, stateful inspection firewall, VPN, 24-port powered (802.3af ) Fast Ethernet switch with Gigabit uplinks, and two expansion slots for Network and Voice Interface Modules (NIM/VIMs).

Aten ALTUSEN 16-port Serial Over the Net KVM Switch – 16 x 16 – 16 x RJ-45 $1409.18 The SN0116 Serial over the NET is a control unit that provides remote serial access to up to 16 (SN0116) servers or other serial IT devices (hubs, routers, power management devices, etc.), via a TCP/IP connection. Up to 16 users can log in at the same time from any computer connected to the Internet, whether down the hall, or half way around the world. Each is able to control a separate port so that 16 attached devices can be accessed at the same time.

Belkin BoaBuds Flexible/Portable Speakers for iPod, MP3 player, Desktop, Laptops, iPhone, & iPad $18.99 var browserName=navigator.appName;if (browserName== Microsoft Internet Explorer browserName== Opera ){document.write( BODY{font-family:verdana,arial,helvetica,sans-serif;font-size:x-small;background-color:#ffffff;color:#000000;margin-top:0px;}TD, TH {font-family:verdana,arial,helvetica,sans-serif; font-size: x-small;} );}else{document.write( BODY{font-family:verdana,arial,helvetica,sans-serif;font-size:small;background-color:#FFFFFF;color:#000000;margin-top:0px;}TD, TH {font-family: verdana,arial,helvetica,sans-serif; font-size: small} );} a:link { font-family: verdana,arial,helvetica,sans-serif; color: #004B91; }a:visited { font-family: verdana,arial,helvetica,sans-serif; color: #996633; }a:active { font-family: verdana,arial,helvetica,sans-serif; color: #FF9933; }a.dynamic, a.dynamic:visited { color: #004B91; text-decoration: none; border-bottom: 1px dashed; }a.noclick, a.noclick:visited { color: #000000; text-decoration: none; border-bottom: 1px dashed; }hr { border-top: 1px dashed #999999;height: 1px;color: #FFFFFF;margin: 3px 0px; }body.dp {}Preview A+ Take your music to new places with Belkin BoaBuds Flexible Speakers. Featuring a distinctive flexi-neck design, BoaBuds can be wrapped around your computer–or even your bedpost–to create a personalized listening environment. A standard 3.5-millimeter headphone jack allows you to connect BoaBuds to laptops, tablets, and MP3 players. The speakers have cable snaps that help keep your cables organized, and they are powered by a standard AC adapter. A saucer-shaped white-and-blue power switch adds to the speakers’ attractive design. table cellpadding= 10 cellspacing= 0 border= 0 width= 250 al

ChargeBlock 8200mA 2.1amp Portable Battery Pack for Fast Charging iPad/iPad2/Tablet PC/iPhone/Android Phones/iPod/DVD/PSP/GPS/Digital Camera and more $74.99 The ChargeBlock for iPad was specifically designed to fast charge the iPad and iPad 2 at (2.1amp). This means you get a portable charging solution that will recharge your iPad with the same speed as the wall adapter. The ChargeBlock for iPad is the ultimate companion for your travels, at 8200MAh it stores enough juice to charge your iPad and iPhone. Yet small enough to easily slide into your briefcase, carry on, purse or backpack. In addition the ChargeBlock will also charge just about any type of mobile device. On one side you can charge anything that uses USB for power such as iPad, iPad 2, playbook, Tablet PCs, iPhone, iPod, Droid, EVO, Nexus, Galaxy, Digital Cameras and GPS. On the other side the 12V output means you can charge even charge Portable DVD players, Netbooks, PSP and more. Say goodbye to worries over a dead battery on long flights, road trips or commutes, simply flip the power switch and keep using your device while it recharges. Built-in smart technology protects your device battery by preventing overcharging and the three integrated LED lights signal battery activity. Simplify your mobile lifestyle. Simple – Never run out of juice you can keep using your device while it recharges. Compatible – Recharge just about any USB device including the iPad, iPad2, Tablet PCs, Playbook, iPhone, Android Phones, GPS. Easy – three blue LED indicator lights signal battery capacity when charging and discharging. Quality – Made for iPad, iPhone and iPod certified and comes with our 1yr warranty. Operating times – iPad – 13 hours of video or internet from a single charge. Package includes: ChargeBlock for iPad. USB cable with changeable tips for Mini and Micro USB, Nokia, LG, Motorola, iPod, iPad 2. 12VDC cable with changeable tips for PSP,DVD,GPS. AC Wall adapter, Carry Bag and User Manual.

Cisco 1811W Integrated Services Routers Fixed Configuration, POE Upgradable $1222.83 Cisco 1800 Series integrated services routers are the next evolution of the award-winning Cisco 1700 Series modular and fixed-configuration routers. The Cisco 1801, 1802, 1803, 1811, and 1812 integrated services routers are fixed-configuration, while the Cisco 1841 Integrated Services Router is modular. The routers are designed for secure broadband, Metro Ethernet, and wireless connectivity, and provide significant performance improvements, feature capability, versatility, and additional value compared to prior generations of Cisco 1700 Series. The Cisco 1800 Series fixed-configuration routers provide: Secure broadband access with concurrent services for branch and small offices Integrated ISDN Basic Rate Interface (BRI), analog modem, or Ethernet backup port for redundant WAN links and load balancing Secure wireless LAN for simultaneous 802.11a and 802.11b/g operation with use of multiple antennas 8-port 10/100 managed switch with VLAN support and optional Power over Ethernet (PoE) Easy deployment and remote-management capabilities through Web-based tools and Cisco IOS Software Cisco 1801, 1802, and 1803 routers provide high-speed DSL broadband access through asymmetric DSL (ADSL2/2+ Annex A and Annex M) over basic telephone service (Cisco 1801), ADSL2/2+ Annex B over ISDN (Cisco 1802), or Symmetrical High-Data-Rate DSL (G.SHDSL) (Cisco 1803) while helping to ensure reliable networking with integrated ISDN S/T BRI backup. The Cisco 1811 and 1812 provide high-speed broadband or Ethernet access through two 10/100BASE-T Fast Ethernet WAN ports and also provide integrated WAN backup through a V.92 analog modem (Cisco 1811) or ISDN S/T BRI interface (Cisco 1812). The Cisco 1800 Series fixed-configuration routers help enable a network infrastructure for SMBs and enterprise small branch offices, providing access to the Internet, corporate headquarters, or other remote offices, while securin

Cisco 5505 Adaptive Security Appliance – 8 x 10/100Base-TX LAN – 1 x SSC $2111.99 The Cisco ASA 5505 Adaptive Security Appliance is a next-generation, full-featured security appliance for small business, branch office, and enterprise tele-worker environments. The Cisco ASA 5505 delivers high-performance firewall, SSL and IPsec VPN, and rich networking services in a modular, plug-and-play appliance. Using the integrated Cisco ASDM, the Cisco ASA 5505 can be rapidly deployed and easily managed, enabling businesses to minimize operations costs. The Cisco ASA 5505 features a flexible 8-port 10/100 Fast Ethernet switch, whose ports can be dynamically grouped to create up to three separate VLANs for home, business, and Internet traffic for improved network segmentation and security. The Cisco ASA 5505 provides two Power over Ethernet (PoE) ports, enabling simplified deployment of Cisco IP phones with zero-touch secure voice over IP (VoIP) capabilities, and deployment of external wireless access points for extended network mobility. High-performance intrusion prevention and worm mitigation service is available with the addition of AIP SSC. Multiple USB ports can be used to enable additional services and capabilities in the future.

Cisco ASA 5505 10-User Bundle – 8 x 10/100Base-TX LAN, 1 x Management, 3 x $595 The Cisco ASA 5505 Adaptive Security Appliance is a next-generation, full-featured security appliance for small business, branch office, and enterprise teleworker environments that delivers high-performance firewall, SSL and IPsec VPN, and rich networking services in a modular, plug-and-play appliance. Using the integrated Web-based Cisco Adaptive Security Device Manager, the Cisco ASA 5505 can be rapidly deployed and easily managed, enabling businesses to minimize operations costs. The Cisco ASA 5505 features a flexible 8-port 10/100 Fast Ethernet switch, whose ports can be dynamically grouped to create up to three separate VLANs for home, business, and Internet traffic for improved network segmentation and security. The Cisco ASA 5505 provides two Power over Ethernet (PoE) ports, enabling simplified deployment of Cisco IP phones with zero-touch secure voice over IP (VoIP) capabilities, and deployment of external wireless access points for extended network mobility. The Cisco ASA 5505 also provides significant expandability and investment protection through its modular design, similar to the rest of the Cisco ASA 5500 Series, offering both an external expansion slot and multiple USB ports that enable the addition of services in the future.

Cisco PVC2300 Business Internet Video Camera: Audio/PoE $411.49 Cisco Small Business Video Surveillance Cameras provide customizable ways for small business owners to monitor and protect their companies. These high-quality solutions can be optimized for many different applications and sites. Each camera can be quickly mounted using the bracket included in the package. The cameras’ compact form factor also enables them to be put inside a protective enclosure for interior or exterior installations. The Cisco Small Business Video Surveillance Cameras use removable CS-mount lenses and can be customized with optional zoom, wide-angle, vari-focal, auto-iris, or other types of lenses as required for a specific application or setting. The Cisco PVC2300 Business Internet Video Camera is a Power over Ethernet (PoE) device, so it can be powered from a PoE switch or power injector via Ethernet cabling. This enables installation near ceilings, on rooftops, or anywhere where power outlets may not be available. The Cisco PVC2300 camera can be mounted on any pan-tilt (PT) base that supports the Pelco D protocol and can be remotely rotated and controlled through an RS-485 interface. It also has two input and two output ports, which can be used to connect the camera to an alarm panel, siren, passive infrared (PIR) sensor, smoke detector, lighting switch (on/off), door sensor, etc. The Cisco PVC2300 uses a high-quality progressive-scan charge-coupled device (CCD) sensor delivering good-quality video. The CCD sensor also has low-light sensitivity, so video can be captured even in very low light environments or during near-dark times of day. Additionally, the camera incorporates an infrared (IR) cut filter that, when used with a separate IR lamp, allows for video capture in total darkness. The Cisco PVC2300 camera supports dual codecs (MPEG-4 and MJPEG). Both codecs can be used simultaneously. MPEG-4 gives efficient bandwidth consumption with good-quality compression and is optimal for real-time viewing of vid

Cisco PVC300 Business PTZ Internet Camera with Audio and POE $568.71 Cisco Small Business Video Surveillance products provide customizable ways for small business owners to monitor and protect their companies. These high-quality solutions can be optimized for many different applications and sites. Each camera can be quickly mounted utilizing the included easy install ceiling bracket. A Pan Tilt Zoom Camera with a 2.6x optical zoom allows for a wide range of applications. The PVC300 is a Power over Ethernet (PoE) device so it can be powered from a PoE Switch or power injector via Ethernet cabling. This enables installations near ceilings on rooftops or anywhere where power outlets may not be available. The PVC300 also has two input and two output ports which can be used for connecting the camera to an alarm panel, siren, Passive InfraRed (PIR) sensors, smoke detectors, lighting switch (on/off), door sensors, etc. The PVC300 uses a high-quality Sony progressive scan CCD Sensor delivering good quality video. The CCD sensor also has low-light sensitivity so video can be captured even in very low light environments or during near dark times of day. Additionally, the camera incorporates an IR Cut Filter which, when used with a separate IR lamp, allows for video capture in total darkness. The PVC300 Surveillance Camera supports dual codecs (MPEG-4 and MJPEG). Both codecs can be used simultaneously. MPEG-4 gives efficient bandwidth consumption with good quality compression and is optimal for real-time viewing of video. MJPEG gives optimal video quality with lossy compression making it ideal for large volume storage to a NAS device. The PVC300′s audio capabilities include 2-way Audio, embedded Microphone, external speaker and microphone ports, and voice compression. SIP support allows for integration into IP PBX solutions. With extensive feature support like IPv6, IP Multicast, RTSP, RTP, Samba Client, and 3GPP, video can be viewed from multiple endpoints and client applicatio

Cisco SLM2008 8-port Gigabit Smart Switch – PD/AC power $118.99 Cisco Small Business Smart Switches deliver cost-effective switching solutions that are ideal for small businesses or workgroups within larger organizations. These high-speed switches offer entry-level management without the cost and complexity of a full Layer 2 managed switch. The Cisco SLM2008 8-Port Gigabit Smart Switch is ideal for conference rooms, labs, shipping/receiving departments or in marketing, design, or audio/visual workgroups. The eight 10/100/1000-Mbps (Gigabit Ethernet) ports enable companies to link to other Gigabit devices on the network (servers, workstations, and network storage) to quickly move bandwidth-intensive files while still supporting 10/100-Mbps clients. The Cisco SLM2008 supports the IEEE 802.3af standard for Power over Ethernet (PoE) for obtaining its power over a designated powered device (PD) switch port or from an external AC power adapter. This gives companies the option to install the switch in places where a power outlet may not be present, such as in ceilings and walls. The Cisco SLM2008 is able to secure the network through IEEE 802.1Q VLANs and IEEE 802.1X port authentication. For environments where IP multicast applications are used, the switch is capable of limiting the traffic to only the ports that have requested that traffic, with support of Internet Group Management Protocol (IGMP) snooping. Additional quality-of-service (QoS) capabilities, such as IEEE 802.1p, differentiated services code point (DSCP), and four hardware queues, make it possible to maintain good quality for real-time applications such as voice and video. The Cisco SLM2008 offers an easy-to-use browser interface for managing and configuring the features, making it ideal for small businesses without an IT staff or that have minimal technical expertise.

Complex Engineered Systems: Science Meets Technology $149 Every time that we take money out of an ATM, surf the internet or simply turn on a light switch, we enjoy the benefits of complex engineered systems. Systems like power grids and global communication networks are so ubiquitous in our daily lives that we usually take them for granted, only noticing them when they break down. But how do such amazing technologies and infrastructures come to be what they are? How are these systems designed? How do distributed networks work? How are they made to respond rapidly in ‘real time’? And as the demands that we place on these systems become increasingly complex, are traditional systems-engineering practices still relevant?This volume examines the difficulties that arise in creating highly complex engineered systems and new approaches that are being adopted. Topics addressed range from the formal representation and classification of distributed networked systems to revolutionary engineering practices inspired by biological evolution. By bringing together the latest research in Complex Engineered Systems, this book sheds light on the current state and future course of this emerging field.

Cutthroat $18 Cutthroat is the name of the game on the electronic frontier. It requires an amoral flexibility with no allies, just alliances; no team loyalties, just self-interest. Strategy forms and dissolves with every play; a smile on the face may mean a knife in the back. In the next round, the players switch sides and do it again. Billions of dollars are at stake.Featuring a bitter struggle between Rupert Murdoch and John Malone, and a supporting cast that includes AJ Gore, Ted Turner, and Bill Gates, author Stephen Keating uses one particular mega-deal that went terribly wrong to reveal how these corporate titans flex market power, crush competition and reap the profits.In 1997, Murdoch’s News Corp. joined forces with EchoStar, Charlie Ergen’s upstart company, to create a satellite-TV powerhouse — nicknamed Deathstar. They planned to bunch a cosmic armada of seven satellites that would deliver several hundred TV channels, internet, and retail services to millions of subscribers. How this deal challenged the entrenched cable-TV monopoly before it came crashing down to earth exposes the influence exerted by and through money, power, and political dynamics among the corporate players fighting to rule the communications world. The roots of this dramatic business conflict are revealed through the separate evolution — and eventual collision — of cable and satellite TV technologies. Cutthroat is the perfect book for anyone who enjoyed Barbarians at the Gate and Den of Thieves.

D-Link 5-Port PoE Fast Ethernet Desktop Switch – 10/100Base-TX – Desktop, Wall Mountable $74.99 The DES-1005P 5-port 10/100 Switch with 1 PoE Port allows you to easily connect a Power over Ethernet (PoE) device such as a wireless access point (AP), IP camera, or IP phone. The switch also gives you the opportunity to add additional Ethernet devices such as computers, printers, and Network Attached Storage (NAS) onto your network.Fast Internet ConnectionThe D-Link DES-1005P 5-port 10/100 Switch with One PoE Port allows you to easily connect a Power over Ethernet (PoE) device such as a wireless access point (AP), IP camera, or IP phone. The switch also gives you the opportunity to add additional Ethernet devices such as computers, printers, and Network Attached Storage (NAS) onto your network. This compact PoE switch operates quietly, making it ideal for use in virtually any room or office. Power Over Ethernet(PoE) The first port of the DES-1005P supports the IEEE 802.3af PoE standard. The port supplies a total PoE budget of 15.4 watts, allowing users to attach an IEEE 802.3af-compliant device to the DES-1005P that requires no additional power. Use PoE for applications that are far from power outlets or when you want to minimize the clutter of extra cables. Auto MDI/MDIX CrossoverAll ports support automatic MDI/MDIX crossover, eliminating the need for crossover cables or uplink ports. Each port can be plugged directly to a server, hub, router, or switch using regular straight-through twisted-pair Ethernet cables. Conserves EnergyThe DES-1005P 5-Port 10/100 Switch makes use of D-Link Green eco-friendly technology, providing energy savings, reduced power consumption, and a longer product life without sacrificing operational performance or functionality. This switch helps to conserve energy through methods such as Link Status and Cable Length Detection. The Link Status feature automatically powers down ports that have no link, allowing the switch to save substantial amounts of energy by cut

D-Link DCS-5610 Pan/Tilt/Zoom PoE Network Camera $852.14 The D-Link Pan/Tilt/Zoom PoE Internet Camera (DCS-5610) is a full-featured surveillance camera designed to monitor the home, office, and small business. IP surveillance systems are quickly gaining ground over conventional CCTV security cameras due to superior performance, low costs, and convenient management. Features such as Power over Ethernet (PoE) support, 2.6x optical zoom, SIP 2-way audio, and 3G mobile phone support make this network camera a premier surveillance solution. With the ability to Pan/Tilt/Zoom, the DCS-5610 is an ideal whole room surveillance camera. Mount the camera on the ceiling or wall and receive whole room surveillance. Support for 802.3af Power over Ethernet (PoE) enables the DCS-5610 to receive both power and data over an RJ-45 Ethernet cable from a PoE enabled switch, negating the need for a nearby power source. The DCS-5610 supports 2-Way Audio with its built-in microphone and audio-out port*. Attach a powered speaker to the audio-out port and remotely communicate with anyone within close proximity to the camera. Additionally, you can utilize the compatible IP Camera Outdoor Enclosure (DCS-70) to monitor and survey in harsh outdoor environments. The DCS-5610 supports both MPEG-4 and Motion JPEG (MJPEG) to provide both high quality and bandwidth efficient compression formats. Motion JPEG delivers greater file integrity, making it ideal for detailed monitoring situations. MPEG-4 video utilizes compressed files, useful for extended recording periods or for use in low bandwidth networks. With support for 2.6x optical zoom and 4x digital zoom, you can view the camera s video feed in close-up detail. Plus, the DCS-5610 supports a resolution of 640×480 at 30fps, allowing for high-quality recordings. Support for 3GPP Mobile Surveillance allows you to view a live video feed from your compatible Internet-ready mobile phone or PDA with a 3GPP player installed. This extends your monitoring capabil

D-Link DGS 1024D – Switch – 24 Ports $249.99 Computers do not require Internet access all the time; neither do switches utilize all ports at all times. When a computer or network equipment is shutdown, switches often remain on and continue to consume considerable amount of power.

D-Link DGS-1016D 16-Port 10/100/1000 Rackmountable Switch $199.99 The first of the Green Ethernet products the DGS-1016D provides 3 key benefits to end users through its cutting edge innovative eco-friendly technology: Reduces power consumption & creates less heat Extended product life Reduces Operating Costs Computers do not require Internet access all the time; neither do switches utilize all ports at all times. When a computer or network equipment is shutdown, switches often remain on and continue to consume considerable amount of power. With Green Ethernet technology, D-Link switches can automatically detect link status and reduce power usage of ports that are idle. Computers or any connecting parties set to standby mode (not power off), however, will not provide significant power savings. The Green Ethernet switches have the ability to analyze the length of any Ethernet cable connected to them for adjustment of power usage accordingly. Shorter lengths require less power. For a traditional switch, power consumption remains constant even when the ports are not in use. In a standard workday scenario where PCs are used for 10 hours a day and powered off 14 hours a day, and connected to the switch using 20 meter cables, D-Link’s Green Ethernet can save up to 20%* power used for each system. Get the blazing speed of Gigabit Ethernet with the D-Link GigaExpress DGS-1016D, an 16-port 10/100/1000Mbps Gigabit Switch that delivers power, performance, and reliability in one cost-effective, space-saving design. Increase the speed of your network server and backbone connections, or make Gigabit to the desktop a reality. Power users in the office, workgroup, or creative production environment can now move large, bandwidth-intensive files faster. Transfer graphics, CGI, CAD, or multimedia files across the network instantly. The versatile and compact 1RU height design of the DGS-1016D enables the device to be rackmounted in a standard 19 inch rack, w

D-Link DGS-1016D 16-Port 10/100/1000 Rackmountable Switch $219.99 The first of the Green Ethernet products the DGS-1016D provides 3 key benefits to end users through its cutting edge innovative eco-friendly technology: Reduces power consumption & creates less heat Extended product life Reduces Operating Costs Computers do not require Internet access all the time; neither do switches utilize all ports at all times. When a computer or network equipment is shutdown, switches often remain on and continue to consume considerable amount of power. With Green Ethernet technology, D-Link switches can automatically detect link status and reduce power usage of ports that are idle. Computers or any connecting parties set to standby mode (not power off), however, will not provide significant power savings. The Green Ethernet switches have the ability to analyze the length of any Ethernet cable connected to them for adjustment of power usage accordingly. Shorter lengths require less power. For a traditional switch, power consumption remains constant even when the ports are not in use. In a standard workday scenario where PCs are used for 10 hours a day and powered off 14 hours a day, and connected to the switch using 20 meter cables, D-Link’s Green Ethernet can save up to 20%* power used for each system. Get the blazing speed of Gigabit Ethernet with the D-Link GigaExpress DGS-1016D, an 16-port 10/100/1000Mbps Gigabit Switch that delivers power, performance, and reliability in one cost-effective, space-saving design. Increase the speed of your network server and backbone connections, or make Gigabit to the desktop a reality. Power users in the office, workgroup, or creative production environment can now move large, bandwidth-intensive files faster. Transfer graphics, CGI, CAD, or multimedia files across the network instantly. The versatile and compact 1RU height design of the DGS-1016D enables the device to be rackmounted in a standard 19 inch rack, w

D-Link DGS-1024D 24-Port 10/100/1000 Desktop/Rackmount Switch $254.99 The first of the Green Ethernet products the DGS-1024D provides 3 key benefits to end users through its cutting edge innovative eco-friendly technology: Reduces power consumption & creates less heat Extended product life Reduces Operating Costs Computers do not require Internet access all the time; neither do switches utilize all ports at all times. When a computer or network equipment is shutdown, switches often remain on and continue to consume considerable amount of power. With Green Ethernet technology, D-Link switches can automatically detect link status and reduce power usage of ports that are idle. Computers or any connecting parties set to standby mode (not power off), however, will not provide significant power savings. The Green Ethernet switches have the ability to analyze the length of any Ethernet cable connected to them for adjustment of power usage accordingly. Shorter lengths require less power. For a traditional switch, power consumption remains constant even when the ports are not in use. In a standard workday scenario where PCs are used for 10 hours a day and powered off 14 hours a day, and connected to the switch using 20 meter cables, D-Link’s Green Ethernet can save up to 25%* power used for each system. Get the blazing speed of Gigabit Ethernet with the D-Link GigaExpress DGS-1024D, an 24-port 10/100/1000Mbps Gigabit Switch that delivers power, performance, and reliability in one cost-effective, space-saving design. Increase the speed of your network server and backbone connections, or make Gigabit to the desktop a reality. Power users in the office, workgroup, or creative production environment can now move large, bandwidth-intensive files faster. Transfer graphics, CGI, CAD, or multimedia files across the network instantly. The versatile and compact 1RU height design of the DGS-1024D enables the device to be rackmounted in a standard 19 inch rack, w