Transcript
2K6_MV1_Monitor_Video.qxd
02/08/06
9:46 AM
Page 46
www.L-com.com - 100% Money Back Guarantee
Video Cabling Tutorial
46
Standard VGA vs. VGA with DDC™ Comparison
Video Display Terms The primary function of Monitor/Video cables is the interconnection between a signal generating device such as a CPU (Central Processing Unit) and a display device such as a monitor. The interfaces used to make this connection have evolved over the years and include HD15, DVI, DFP, EVC and HDMI to name just a few. Listed below are some associated common terms and definitions. Analog Signals: Both video and audio signals that are continuously varying in level are said to be analog. Amplitude
Analog Signal
A quick examination of the pinout tables listed shows the use of pins 9 and 15 in the right hand column. A DDC enabled port can be easily identified by the royal blue color of the insulator. New monitors with this implementation require the presence of pins 9 and 15 to operate correctly.
VGA with DDC™
VGA
Pin 1 Pin 1 Pin 6
Pin 6 Pin 15
Pin 11 Pin
Signal
Pin
Signal
Pin
Signal
Pin
Signal
1 2 3 4 5 6 7 8
Red Green Blue ID Bit 2 Ground Red Shield Green Shield Blue Shield
9 10 11 12 13 14 15
NO CONNECTION Sync Return ID Bit 0 ID Bit 1 Horizontal Sync Vertical Sync NO CONNECTION
1 2 3 4 5 6 7 8
Red Green Blue ID Bit 2 Ground Red Shield Green Shield Blue Shield
9 10 11 12 13 14 15
DDC +5V Sync Return ID Bit 0 ID Bit 1 Horizontal Sync Vertical Sync ID Bit 3 or Data Clock
DDC™ of VESA (Video Electronics Standard Association)
Time
Attenuation: A reduction in the strength of a signal. Bandwidth: The difference between the upper and lower usable limits of a band of frequencies. Baseband: Unmodulated video or audio signals with an exclusive transmission path. Chroma: The color portion of a video signal “C”. Composite Sync: A combination of horizontal and vertical sync pulses. dB: A logarithmic unit of measure where 3dB represents a doubling or halving the power level from a given starting point. DDC: (Data Display Channel) is a standard that defines communication between a monitor and a host system. Digital Signals: Data presented as discrete values i.e. On/Off or Binary. Amplitude
Various DVI Configurations Shown are a number of DVI connector interfaces that can be identified by the pin configurations. They include DVI-A (analog only), DVI-D (digital only) and DVI-I (analog and digital). In addition, single link and dual link configurations exist for both DVI-D and DVI-I. Shown are the major configurations illustrating the distinguishing features for each type of DVI interface.
ANALOG and DIGITAL
ANALOG ONLY
DIGITAL ONLY
DVI-I Single Link
DVI-D Single Link
Three rows of 6 pins and two contacts above and below the flat blade.
Three rows of 6 pins and no contacts above or below the flat blade.
DVI-A One row of 5 pins, one row of 3 pins and one row of 4 pins with two contacts above and below the flat blade.
DVI-I Dual Link
DVI-D Dual Link
Three rows of 8 pins and two contacts above and below the flat blade.
Three rows of 8 pins and no contacts above or below the flat blade.
Common Computer Interfaces Digital Signal Time
KVM: Keyboard, Video, Mouse. The three major connections found on a typical desk top computer set up. Luma: The brightness portion of a video signal (“Y”). Pixel: A single point on a display. Resolution: The density of pixels in a given area typically expressed as the horizontal x vertical values, (ex. 640x480). Refresh Rate: Also referred to as scan rate. It is the number of times in one second (Hz) that the electron beam travels across the screen horizontally from one scan line to the next. RGB: Red, Green and Blue. SVGA: Super Video Graphics Array. S-Video: A video signal that separates the “Y” or Luma and “C” or chroma information.
Major Digital Interfaces Standards Group Maximum Channels Maximum Resolution Analog / Digital Combination Digital / Audio
L-com
®
CONNECTIVITY PRODUCTS
EVC (Enhanced Video Connector) or P&D (Plug & Display)
VESA (Video Electronics Standards Association) 3 SXGA (1280 x 1024) P&D (30 + 4 Pin) Yes No 2006 Master Catalog 1.0 Prices and specifications subject to change.
The interconnection between a Central Processing Unit (CPU) and the Monitor, Mouse, Keyboard and Speakers found in a typical desktop computer set up uses a number of different interfaces. Below is a list of some of the more common types. CPU to Monitor
DFP
HD15
EVC
DVI
Monitor
CPU to Keyboard
Mini DIN 6
Keyboard
USB
CPU to Mouse Mouse
Mini DIN 6
CPU
3.5mm
Speakers
DFP (Digital Flat Panel)
DFP (Digital Flat Panel Group) 3 SXGA (1280 x 1024) No No E-mail:
[email protected]
USB
CPU to Speakers
DVI (Digital Video Interface)
DDWG (Digital Display Work Group) 6 (Dual Link) QXGA (2048 x 1536) DVI-I (24 + 4 Pin) Yes No Fax: 978-689-9484
HDMI (High Definition Multimedia Interface)
HDMI Founders (Consortium of leading consumer electronics manufacturers) 8 HDTV 720P and 1080i No Yes
Hours: Mon - Thu 8am-6pm, Fri 8am-5pm EST
Order Online or Call 1-800-343-1455
