Universal Broadband Router Hardware Installation Guide

ManualsBrandsCisco Systems ManualsNetwork RouterUniversal Broadband Router Cisco uBR10012

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Cisco uBR10012 Universal Broadband Router Hardware Installation Guide

OL-18259-01

APPENDIX

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-4 and 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-3 to 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