- This topic has 28 replies, 1 voice, and was last updated 2 weeks, 2 days ago by
Olegabaft.
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vasanth
Guestwhy we are using -48v…
1.pulse
2.moisture
3.earthing(lightening effects)Lalit
GuestBasically many reasons bt first is that noise and intrefrence is min at -ve supply voltage and second is that to protect from lightning
MRG
Guest(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.Abid Hussain Khan
GuestHi 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?
BIBHUTI BEHERA
Guest1* 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.
gyan
GuestIt 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.
Vasuki soni
GuestCan 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..
manzer aquil
Guestwhy use -48 volt why not -50volt in BTS
sri
Guestthe standard lead acid cells or others are of 12vdc. Mulitiples of 12 gives 48V.
swati kumari
GuestWhy dc is given to bts ,why not ac?
james
Guestwhat does pulse and lightening to do with -48v DC?
Tadele Haile
GuestThank you for your informative answer to my burning question that i heard from interview question.
i hope we will be in touch.
Ramasabarinathan
Guestwhy in BTS eqiupment use only DC voltage?
can you please give informations in briefly.Amir
Guestwhy we use telecom equipment DC Voltage?
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