Community discussions

MikroTik App
 
proggams2
Member Candidate
Member Candidate
Topic Author
Posts: 140
Joined: Wed Mar 14, 2007 10:15 pm

Question concerning wireless rates !

Tue Oct 13, 2009 9:38 am

I cannot understand the negative (-) in wireless systems. Mikrotik writes noise floor , signal strenght, ... in negative form.
Ok i know we can get negative, but it is all negative, even a close AP i get negative signal in dB.

I need someone to tell me if -40 is better signal than -80 ??
since im new with the wireless in mikrotik.
 
User avatar
normis
MikroTik Support
MikroTik Support
Posts: 24609
Joined: Fri May 28, 2004 11:04 am
Location: Riga, Latvia

Re: Question concerning wireless rates !

Tue Oct 13, 2009 12:10 pm

:D

-55 is a good signal
-85 is bad signal

anything in between is fine, but closer to -55 is better
No answer to your question? How to write posts
 
ScooyDoo
just joined
Posts: 6
Joined: Tue Oct 06, 2009 7:49 am

Re: Question concerning wireless rates !

Tue Oct 13, 2009 3:37 pm

This may help shed some light on the subject:

http://www.moonblinkwifi.com/dbm_to_watt_conversion.cfm
 
User avatar
marioclep
Trainer
Trainer
Posts: 140
Joined: Sat Jul 11, 2009 4:36 pm
Location: Cordoba - Argentina
Contact:

Re: Question concerning wireless rates !

Tue Oct 13, 2009 4:17 pm

I cannot understand the negative (-) in wireless systems. Mikrotik writes noise floor , signal strenght, ... in negative form.
Ok i know we can get negative, but it is all negative, even a close AP i get negative signal in dB.

I need someone to tell me if -40 is better signal than -80 ??
since im new with the wireless in mikrotik.
I think you're not familiar with Decibels, try reading this wiki: http://en.wikipedia.org/wiki/Decibel

To simplify your question, -80 dBm is considered to be the niose floor (in certain cases -100 dBm). So you will always need to calibrate your wireless systems in order to get the higest value. Just like any ohter kind of unit, negative decibels are higer (better in your case) when they are near to 0. i.e. -40 is higher to -80 and so on
---------------------

Ing. Mario D. Clep
CTO - MKE Solutions
MikroTik Certified Trainer

Who is online

Users browsing this forum: No registered users and 39 guests