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why we are using -48v…
1.pulse
2.moisture
3.earthing(lightening effects)Basically many reasons bt first is that noise and intrefrence is min at -ve supply voltage and second is that to protect from lightning
(i) Positive voltages cause comparatively more corrosion in metal than negative voltages.
(ii) Negative voltages are safer for human body while doing Telecom activities.
(iii) Lightning may cause positive voltages in the equipment circuitry. In that case, negative voltages (lack of electrons) neutralize positive charges and prevent excessive heat.
(iv) Negative voltage is safer for long telephone line for transmitting power trough it.Hi everybody,
Thanks to all for clear my confusion about why telecom equipment use -ev voltage but my question is why it is 48vDC (2*24), why not 50vDC (2*25)??
is there any restriction for DC voltage supply?
1* In negative voltage due direct current less noise occurs… As a result telecom equipment gives high output..
2* corrosion less on eqiupment3* It protect the equipmet fom lightning.
It is -48 V D.C cause of the commercial battery stack available. Commercial battery stack is available in -12 V, -24 V or – 48 V. For info, actually any telecom equipment or for that matter any sophosticated equipment runs on a range of supply voltages by using their own inbuilt SMPS and it is very difficult to maintain a constant voltage by the power source.
Can negative voltages be used in other domains like power systems preferably to protect equipments from lightning and noise as has been identified in above comments..
why use -48 volt why not -50volt in BTS
the standard lead acid cells or others are of 12vdc. Mulitiples of 12 gives 48V.
Why dc is given to bts ,why not ac?
what does pulse and lightening to do with -48v DC?
Thank you for your informative answer to my burning question that i heard from interview question.
i hope we will be in touch.
why in BTS eqiupment use only DC voltage?
can you please give informations in briefly.why we use telecom equipment DC Voltage?
