Free Erlang traffic calculators

The world's first online Erlang traffic calculators

Telecom Traffic Online
  Home | Free calculators | Products | Tech. papers | Forum | About us
Erlang for Excel
A-Z termination using H.323 and SIP
A-Z termination
  • VoIP softswitch

    DUAL Softswitch is a complete Voice over IP switching and billing solution.  Flat monthly rate.

    Web control panels; Least Cost Routing; Excel tariff uploads; SIP and H323 support.

    H323 SIP softswitch >>

  • VoIP calling

    Premium quality termination for wholesale carriers with their own VoIP switch.

    44Direct >>


    Our lowest rates for wholesale carriers with their own VoIP switch.

    44Mobile >>


    Our unique online callshop billing system.

    Bill My Calls >>

DB to DBm conversion

pix - 12th September 2013  (19:30 GMT)

hi,

dB is not a "measurement" unit, it is a "comparison" unit. Your "dBm" measurement can be converted into mW, W or whatever power unit you want.

1dB does not mean anything by itself. You can only use "dB" to compare two values. For example: value A is 1dB higher than value B, whatever the values A and B.

If someone asks you to provide a measurement in "dB", it means they made a common mistake. They actually want "dBm".

Cheers
pix

Dhananchezhiya Parasuram - 12th September 2013  (06:18 GMT)

I am using Selective Level Meter(SLM) to measure power line carrier communication gain in this meter its showing only the unit of dBm but I need to measure inform of dB Its there any formula to convert dBm to dB, any one can explain details please.

lakhindar murmu - 21st August 2013  (10:55 GMT)

hi all
can anybody help me how to visualize group delay response of a microstrip filter in IE3D software?

Somaliland - 15th May 2012  (08:56 GMT)

x = 10 log_{10}(1000P)
where P is the power in W and x is the power ratio in dBm

pix - 4th May 2012  (11:46 GMT)

misa,

wikipedia, google, etc...

pix

misa - 3rd May 2012  (12:27 GMT)

thanks pix for explanation , what is the mathematic formula to convert from DBm to Watt and vice versa

pix - 15th April 2012  (07:30 GMT)

misa,

no, that is very very wrong.
dB cannot be converted in dBm ! those are not counting the same thing.

dBm is an absolute power. It can be converted in Watts.
2W = 33dBm

dB is a difference of dBm, and it has no physical existence other than this. It is a mathematical tool.

For example, from 39dBm to 42dBm, there is a difference of +3 dB.
You cannot convert 3dB to watts. But you can convert dBm into watts.
39dBm = 8W
42dBm = 16W

but 3dB is not equal to 8W !!!

Regards
pix

misa - 10th April 2012  (19:53 GMT)

hi all

how can to convert from DB to DBm
is the formula that DBm=DB+30
and DB=DBm-30

Other messages

Other messages: [<<Previous 10]

Post a reply to this article

Name Enter your name.
Message Enter your message.
Email Optional -  If you enter your email address in this box, then you will automatically be notified if anyone replies to your message.  Your email address will only be published if you pay to post this message.
Verification
Please confirm you are human.
Press the button to post your message.
Home | Free online calculators | Products | Technical papers | Forum | Contact us | About us

Last modified: 17 May 2017

Copyright 2017. All rights reserved.