Cisco Systems Cisco uBR10012 manual Frequency Allocation

A P P E N D I X C

Frequency Allocation

This appendix provides information on broadcast and cable television NTSC and PAL/SECAM standards and frequencies used around the world.

There are three standards for transmitting video. They are defined by the method of encoding color onto a monochrome signal. The methods are defined as:

•NTSC—National Television System Committee.

NTSC is the current standard used for analog television in the United States and elsewhere. NTSC supports color television transmission in a 6 MHz channel bandwidth and has 525 interlaced scan lines. Two fields are interlaced to make one frame with a frame rate of 29.97 frames per second and a field rate of 59.94 fields per second. A fraction (~8%) of the available bandwidth is used for signal synchronization between the transmitter and the receiver giving an effective resolution of 640x480. The aspect ratio, or ratio of picture width to picture height, is 4:3.

•PAL—Phase Alternating Line.

PAL is a composite color system similar to NTSC. In PAL, however, the color difference signals alternate phase at the horizontal line rate. PAL video consists of a 625-line frame, a frame rate of 25 Hz, and a field rate of 50 Hz. As with NTSC, ~8% of the available bandwidth is used for synchronization yielding an effective resolution of 768x576. The aspect ratio is 4:3. The PAL standard and it's variants are used primarily in Europe, China, Asia, Africa, Australia, Brazil, and Argentina.

•SECAM—SEquential Couleur Avec Memoire.

SECAM is a color television broadcasting system using 625 picture lines and a 50-hertz (Hz) field rate, in which the two color-difference signals are transmitted sequentially instead of simultaneously.

General NTSC information is covered in Table C-4and Table C-5. General PAL/SECAM information is covered in Table C-7. Use the information in Table C-1, Table C-2, and Table C-3to compare analog television standards used around the world.

Check these Web sites for more information about world-wide frequency allocation.

http://www.blondertongue.com/WebPages/Reference/pdf/CATVref_Section_5_6_r.pdf

http://www.geo-orbit.org/sizepgs/ntscp.html#anchor1016493

http://www.acterna.com/downloads/posters/frequency_chart-acterna.pdf .

http://developer.apple.com/technotes/tn/tn1012.html#RTFToC4

http://www.c-cor.com/

http://www.atxincorporated.com/

http://www.alkenmrs.com/video/standards.html

Cisco uBR10012 Universal Broadband Router Hardware Installation Guide

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