Distributed Antenna Systems

When cellular reception is poor in office buildings, airports and parking garages, it can lead to missed calls, opportunities and lost revenue. The need for seamless and robust wireless coverage is critical for employees to be efficient and effective. Low-quality signals and dropped connections decrease productivity. True work mobility requires a workplace with comprehensive work coverage. When these problems are addressed the results in enhanced efficiency and productivity lead to business gain and revenue growth . FCS has partnered with Wilson Pro to help to provide the most cost effective DAS solution for your business.

How is signal strength actually measured?

The signal your phone receives from a cell tower is measured in decibel-milliwatts (dBm), a unit of electrical power in decibels (dB), referenced to 1 milliwatt (mW). There are three things you need to know to understand how decibel-milliwatts work:

  1. One milliwatt of power is equal to 0 dBm. Since cellular signal operates on less power than that (as low as 0.0000000001 mW, sometimes less), dBm signal strength is measured in negative numbers. The closer you get to 0 dBm, the stronger the signal; so, −70 dBm is stronger than −90 dBm.

  2. The milliwatt scale is logarithmic , meaning that a change in dBm yields an exponential change in mW. For example, −70 dBm (0.0000001 mW) is ten times more powerful than −80 dBm (0.00000001 mW), one hundred times more powerful than −90 dBm (0.000000001 mW), and one thousand times more powerful than −100 dBm (0.0000000001 mW).

  3. Any change in dBm (gain or loss ) is noted in ±dB. So if you start with −90 dBm of cellular signal, and you install a cell phone booster system that gives you +30 dB of gain, you’ll end up with −60 dBm of signal.

So, what is considered strong or weak cell signal?

Signal strength

1) Greater than −60 (dBm) Excellent (you’re very close to a cell tower)

2) Range −60 to −75 (dBm) Very good (usually this is the best it gets)

3) Range −76 to −90 (dBm) Good (you’re in an area with decent coverage)

4) Range −91 to −100 (dBm) Fair (coverage is spotty, and may be slow)

5) Range −100 to −110 (dBm) Poor (very weak; you may be having connectivity problems)

6) Less than −110 (dBm) No signal (you’re probably unable to make or complete a call)