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Question
Why -48V dc power supply using in telecom field?
 Question Submitted By :: Vinayak.kadam
I also faced this Question!!     Rank Answer Posted By  
 
  Re: Why -48V dc power supply using in telecom field?
Answer
# 1
no idea??? 
Is This Answer Correct ?    6 Yes 13 No
Vinayak.kadam
 
  Re: Why -48V dc power supply using in telecom field?
Answer
# 2
Why Because Earthing contrctor Earn money so that 
Is This Answer Correct ?    5 Yes 10 No
U.chandarasekar
 
 
 
  Re: Why -48V dc power supply using in telecom field?
Answer
# 3
Equipments which is used in telecom field Designed
for -48volts
 
Is This Answer Correct ?    5 Yes 8 No
Shivareddy
 
  Re: Why -48V dc power supply using in telecom field?
Answer
# 4
Basically for any electronic device it needs a DC supply as
a source power the different components inside it.
everybody knew that the telephone in our houe will not
contain any supply line (speaking about basic model) other
than the one that comes from the exchange. but how is the
Electronic board inside the telephone is working?

this line carries a DC voltage of 48V (42V to $8V approx).
this voltage supplies power to the components inside the
telephone as well as carries the voice signals from
exchange to our phone and vice versa.
 
Is This Answer Correct ?    14 Yes 6 No
Cnu
 
  Re: Why -48V dc power supply using in telecom field?
Answer
# 5
because all of the electronics equipments used in telecom
field(bts,tx-rx rack,mux etc)are working in dc supply,so
that this is happen.
 
Is This Answer Correct ?    4 Yes 8 No
Ratikanta Mekap
 
  Re: Why -48V dc power supply using in telecom field?
Answer
# 6
- 48 VDC is used in telecom to prevent corrosion or
electrolysis. If you use +48VDC there are free electrons
raging to go somewhere, as each electron is lost, you lose
what is part of a molecule of copper, thus the copper
corrodes away, lines corrode away until they break! -48VDC
wants electrons so it attracts molecule = no loss of copper
or corrosion/electrolysis.
 
Is This Answer Correct ?    26 Yes 2 No
R. D.
 
  Re: Why -48V dc power supply using in telecom field?
Answer
# 7
positive is earthed ? 
Is This Answer Correct ?    5 Yes 3 No
K.prakashchandra
 

 
 
 
Other Electrical Engineering Interview Questions
 
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why a pure inductive circuit has zero power output?   8
what happens when the supply frequency to the tube light is reduced to 25Hz....?   4
What do you mean by linear and bilateral network? Disa 16
Why in Digital Megger for finding Insulation resistance,-ve is applied to core or conductor and +ve is applied to ground. ACC 1
why do you give the dc supply to field of alternator   2
how electrical energy is converted into mechanical energy in dc motor   3
where would be tap changer in transformer & why? Kentz 2
A three phase load, around 4 km away from the 11/0.433KV distribution transformer (Neutral of Transformer is solidily earthed) and consisting of mainly very costly and sensitive electronic equipments is giving trouble due to high voltage difference between neutral and body earth. Whether this problem can addressed by connecting neutral at the load point solidly to earth?   3
Why earthing transformer used in Distribution Sub-Station?   2
three phase 180kva diesel generator can take how much load in amp and what is formula to get this? lenovo 11
why the star delta motors burn out frequently   1
what are the safety of chiller.   3
 
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