Interested to Buy Any Domain ? << Click Here >> for more details...
Why -48V dc power supply using in telecom field?
- 7 Answers
- 23805 Views
- APC, Cisco, I also Faced
- E-Mail Answers
Answer Posted / cnu
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 ? | 16 Yes | 9 No |
Post New Answer View All Answers
how to find 5 kilo meter long under ground 33 kv cable fault location if IR VALUE shows 0.05 M ohm @5000 volt.and cable fault locator shows some time fault distance 3 kilo meter ,3.7 kilo meter and some time 1 kilo meter? now how to find the fault location that where is leakage. note--it is tested with 5000 kv megger and insulation resistance is 0.05 M ohm. and some time 0.03 M ohm comes.
Why we used 690V in ACS 800 drives.Why dont use standard voltage like 415v or 1.1Kv
Can we put 3 layers of cable tray while installing tray
How many types of oil using in H/T & L/T Oil Circuit Breakers. need Explenation ?
Who are the manufactures those manufacturing 3Cx2.5sqmm FRLS cables. I heard about FRLS technology adopted only in wires useful for wirings
operation of diesel generator
What is inrush current? how can calculateit? what is the affect of it?
A motor running with lenze frequiency inverter stops if I REDUCE SPEED with 25% load.If I run it in High speed and medium speed running smoothly with full load.please help me to solve it.
how to estimate wiring ins roughing ins. and boxes
What are the factors which influence the choice of specific magnetic and electric loadings of a synchronous machine?
at what rate the micro controller increment its timer....is it 1micro seconds or 1/(12*10^6) seconds
Differentiate between low pass, high pass and band pass filter?
What is stacking factor? What is its approximate value?
what is servo motor and how it works?
i am going to correct power factor of 1600kw induction motor,when i calculate capacitance of capacitor it is three time more in star connection than delta. if motor is star connected which connection i shall adopt for capacitors and reason for adopt this connection
