By David Hucaby
CCNA instant 640-722 legitimate Cert consultant from Cisco Press allows you to be successful at the enforcing Cisco Unified instant Networking necessities (IUWNE) examination the 1st time and is the single self-study source authorized by means of Cisco. Best-selling writer and specialist teacher David Hucaby stocks coaching tricks and test-taking tips, assisting you establish components of weak point and increase either your conceptual wisdom and hands-on talents.
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Additional info for CCNA Wireless 640-722 Official Cert Guide
Cable vendors supply the loss in dB per foot or meter of cable length for each type of cable manufactured. Once you know the complete combination of transmitter power level, the length of cable, and the antenna gain, you can figure out the actual power level that will be radiated from the antenna. This is known as the effective isotropic radiated power (EIRP), measured in dBm. EIRP is a very important parameter because it is regulated by governmental agencies in most countries. In those cases, a system cannot radiate signals higher than a maximum allowable EIRP.
Carrying Data Over an RF Signal Up to this point in the chapter, only the RF characteristics of wireless signals have been discussed. The RF signals presented have existed only as simple oscillations in the form of a sine wave. The frequency, amplitude, and phase have all been constant. The steady, predictable frequency is important because a receiver needs to tune to a known frequency to find the signal in the first place. This basic RF signal is called a carrier signal because it is used to carry other useful information.
Whenever it is cut in half, it decreases by –3 dB. ■ Fact 3—A value of 10 dB means that the power value of interest is 10 times the reference value; a value of –10 dB means the power value of interest is 1/10 of the reference. When P2 is 10 times P1, the ratio is always 10. Therefore, 10log10(10) = 10 dB. When P2 is one tenth of P1, then the ratio is 1/10 and 10log10(1/10) = –10 dB. The 10 dB fact is intuitive because multiplying or dividing by 10 adds or subtracts 10 dB, respectively. Notice another handy rule of thumb: When absolute power values multiply, the dB value is positive and can be added.