TELECOMMUNICATIONS SYSTEMS
COMMUNICATION WIRELESS COMPUTING DEVICES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
How big the tower is
|
|
|
The number of bars on your phone
|
|
|
Where the tower is located
|
|
|
The size of your phone
|
Detailed explanation-1: -The bars (or dots, depending on your phone model) don’t relate to actual decibel numbers-instead, they indicate the relative strength of the available signal. The key word here is relative. One bar indicates lower signal strength than two bars. And two bars represent lower signal strength than three bars-and so on.
Detailed explanation-2: -Decibels offer a more accurate and useful measure of cell phone signal strength. Signal strength for cellphones is calculated using dBm (or decibel milliwatts) as its standard unit of measure. On a signal strength meter, dBm is typically expressed as a negative number-such as-88.
Detailed explanation-3: -Signal strength is represented in-dBm format (0 to-100). This is the power ratio in decibels (dB) of the measured power referenced to one milliwatt. The closer the value is to 0, the stronger the signal. For example, -41dBm is better signal strength than-61dBm.
Detailed explanation-4: -Signal strength is measured in dBm or decibel milliwatts, which, somewhat confusingly, is expressed only in negative values (with a minus sign in front).