|
September 2010 |
The Digital Visual Interface (DVI) is a video interface standard designed to provide very high visual quality on digital display devices such as flat panel LCD computer displays and digital projectors. It is designed for carrying uncompressed digital video data to a display. It is partially compatible with the High-Definition Multimedia Interface (HDMI) standard in digital mode (DVI-D), and VGA in analog mode (DVI-A). 
DVI to HDMI
DVI is mostly compatible with HDMI. The main difference is that DVI carries no audio data. If a PC's DVI output does not provide audio, it can be patched in as part of the DVI to HDMI adapter.
Connector
The DVI connector usually contains pins to pass the DVI-native digital video signals. In the case of dual-link systems, additional pins are provided for the second set of data signals.
Dual-link should not be confused with dual display (also called dual head), which describes those situations where a computer is hooked up to two monitors at once. Neither, either, or both of the dual displays could be dual-link. Depending on the video card(s), the displays could be both analog (VGA), an analog and a digital, or both digital.
As well as digital signals, the DVI connector includes pins providing the same analog signals found on a VGA connector, allowing a VGA monitor to be connected with a simple plug adapter (or with a special purpose DVI-A or DVI-I to VGA cable). This feature was included in order to make DVI universal, as it allows either type of monitor (analog or digital) to be operated from the same connector.
 The DVI connector on a device is therefore given one of four names, depending on which signals it implements:
* DVI-D (digital only)
* DVI-A (analog only)
* DVI-I (integrated - digital and analog)
* M1-DA (integrated - digital and analog, and USB)
The connector also includes provision for a second data link for high resolution displays, though many devices do not implement this. In those that do, the connector is sometimes referred to as DVI-DL (dual link).
The long flat pin on a DVI-I connector is wider than the same pin on a DVI-D connector, so it is not possible to connect a male DVI-I to a female DVI-D by removing the 4 analog pins. It is possible, however, to connect a male DVI-D cable to a female DVI-I connector. Many flat panel LCD monitors have only the DVI-D connection so that a DVI-D male to DVI-D male cable will suffice when connecting the monitor to a computer's DVI-I female connector.
DVI is the only widespread video standard that includes analog and digital transmission options in the same connector. Competing standards are exclusively digital: these include a system using low-voltage differential signaling (LVDS), known by its proprietary names FPD-Link (flat-panel display) and FLATLINK; and its successors, the LVDS Display Interface (LDI) and OpenLDI.
Some new DVD players, TV sets (including HDTV sets) and video projectors have DVI/HDCP connectors; these are physically the same as DVI connectors but transmit an encrypted signal using the HDCP protocol for copy protection. Computers with DVI video connectors can use many DVI-equipped HDTV sets as a display; however, due to Digital Rights Management, it is not clear whether such systems will eventually be able to play protected content, as the link is not encrypted.
For more details, please see the source article at http://en.wikipedia.org/wiki/Digital_Visual_Interface
|
|
|
August 2010 |
|
Other Mobile Racks
|
Features
-
8x Hot-Swap dive trays supporting both SAS and SATA 2.5” drives.
-
SAS Expander backplane allows you to daisy chain multiple enclosures, supporting up to the theoretical maximum of 144 drives.
-
Takes up two 5.25” chassis slots meaning you can have two daisy chained enclosures totalling 16 drives in a mid tower configuration.
-
Same features as a full size enclosure: drive activity and drive fail LEDs, cooling fan, overheat/fan fail LEDs and alarms.
Properties
Dimensions: 147mm x 80mm x 200mm - With Fan
Gross Weight: 1.8kg
Occupancy: 2x 5.25" Drive Bays
Capacity: 8x 2.5" Hot-swap SAS/SATA Hard Disk Drives
Cooling: 8cm Exhaust Fan
Maximum Bandwidth: 4 x 3Gb/s
Click here to return
|
|
|
August 2010 |
|
Many schools have installed closed circuit cameras for security surveillance purposes. Some have success and some do not. Cameras play a major part in this fortune game and we would like to explain what, why and how.
We have the traditional CCTV cameras that use analogue magnitudes to represent video images and we also have the modern Internet Protocol cameras that use computer binary methods. The transition is abrupt in terms of technologies employed but very gradual in terms of deployment by the market. Put an analogue camera and IP camera side by side and assuming they have the same shape and colour, we will see that IP is obviously bigger than its analogue counterpart. This is because IP needs more space to accommodate the computing chips that convert analogue into binaries. Are these computing chips justifiable for the increase in size, complexity and presumably price?
Without going into technical details, the simple answer is that IP has improved the resolution or clarity of video images significantly for security surveillance purpose. The best commercial off the shelf (COTS) analogue camera is equivalent to VGA (640 x 480 pixels) standard whereas a good but not best IP camera is SXGA (1280 x 1024).
A tutorial on video surveillance cameras can be found here if you wish to know more about cameras. http://www.cnz.co.nz/content/view/67/36/
|
|
|
August 2010 |
|
A PC is a PC, as many people said. This is a simplistic view because PC is a category and it contains a large range of variations. To say a category is a category conveys no useful message. We would like to do better and propose 3 dimensions for reference. They are eco-being, functional and cost features. This framework of considerations will help school management makes informed decisions on purchase of PC assets by setting the relative weightings of the 3 dimensions.
- Eco-being refers to the aesthetics and form factor of a PC, its human interface and its existence in the larger environment.
- Functional refers to usages such as a cloud device, a standard desktop of a local area network, a server or a dedicated graphics rendering machine.
- Cost features refer to the economies of operation and maintenance such as on electricity, labour, frustrations and opportunities.
TECHNICAL INFO BELOW
The latest PC technology is integrated graphics in the CPU as a progression towards miniaturisation. It is a step further than on-board graphics or integrated graphics in the chipset (motherboard). This enables small form factor machines (micro ATX) to have higher computing power (Intel Core i3 and i5) and graphics processing power (Intel GMA HD) at the same time. Please click this http://www.compucon.co.nz/content/view/711/200/ to see the specification of such a machine called Compucon Diamond Plus.
This system exceeds the requirements of students (process workers) and enters the knowledge PC domain but is not appropriate for handling graphics intensive workloads. It is designed to achieve a low total cost of ownership for high end mainstream users.
|
|
|
August 2010 |
|
Many organisations have installed closed circuit cameras for security surveillance purposes. Some have success and some do not. Cameras play a major part in this fortune game and we would like to explain what, why and how.
We have the traditional CCTV cameras that use analogue magnitudes to represent video images and we also have the modern Internet Protocol cameras that use computer binary methods. The transition is abrupt in terms of technologies employed but very gradual in terms of deployment by the market. Put an analogue camera and IP camera side by side and assuming they have the same shape and colour, we will see that IP is obviously bigger than its analogue counterpart. This is because IP needs more space to accommodate the computing chips that convert analogue into binaries. Are these computing chips justifiable for the increase in size, complexity and presumably price?
Without going into technical details, the simple answer is that IP has improved the resolution or clarity of video images significantly for security surveillance purpose. The best commercial off the shelf (COTS) analogue camera is equivalent to VGA (640 x 480 pixels) standard whereas a good but not best IP camera is SXGA (1240 x 1024). A tutorial on video surveillance cameras can be found here if you wish to know more about them. http://www.cnz.co.nz/content/view/67/36/
|
|
|
|
<< Start < Prev 191 192 193 194 195 196 197 198 199 200 Next > End >>
|
| Results 1756 - 1764 of 2512 |
