Why negative voltage is used in BTS?

Why negative voltage is used in BTS?

Since negative voltage has a lack of electrons, it can neutralize the positive charge that can avoid producing heat. The negative voltage is used, so the current leaked due moisture does not electroplate away the copper, which is present in the cables.

Why is DC 48V?

The reason Bell selected -48VDC is because it provides enough in power to support a signal, but not enough to be dangerous. In fact, -48VDC allows telecom operators to use 12-volt lead-acid batteries wired in series to act as a backup power source in the event of a power failure.

What uses 48V power supply?

Today, it is widely documented that 48V is used in such areas as data centers, automobiles, LED lighting, industrial equipment and even power tools.

What is the purpose of negative voltage?

A negative voltage is a relative excess of electrons compared to some other point. If 0 V is no voltage. Negative voltage is an excess of electrons and positive voltage is a deficiency of electrons.

What is 48v DC?

48VDC is the voltage used in telephone exchanges and large ISPs. This is. usually provided from a battery bank which is constantly on charge (or. some more clever arrangement) so that it is effectively a UPS. The cost.

What is the difference between positive and negative DC voltage?

The magnitude of a voltage can be either positive or negative. If the voltage magnitude is positive, the voltage has the same polarity as shown on the diagram. If the voltage magnitude is negative, the voltage polarity is the opposite to that shown on the diagram.

Is 48V safe?

48V is the practical and LEGAL definition of the maximum voltage to be considered “low voltage” and intrinsically “safe”. But we are assuming people aren’t walking around with subcutaneous electrodes exposed to accidental contact with “LV” wiring. 48V is reasonably safe for most people under normal conditions.

Why the positive terminal of DC is grounded?

The frame is also connected to the earth or ground (sometimes using the green wire in the power cord). In contrast to the three cases described above, the reason for grounding the positive terminal of the power supply battery in telephone outside plant wiring is to minimize the amount of corrosion on the copper wire.

How many watts is 48 volts DC?

Industrial DC power supplies; heavy duty AC/DC power supplies 48V output up to 1500 watts, NAFTA Eligible.

What happens if voltage is negative?

Note: The voltage polarity indicated on circuit schematics only provides a sign convention by which to interpret voltages. It indicates the polarity associated with a positive voltage. If the voltage is negative, the polarity is simply reversed.

What does negative 12 volts mean?

When we say that something has a potential of a specific value (-12 volts in your question), this is RELATIVE to the potential of something taken as a reference– usually, the earth– “ground”. So– if we take a 12-volt battery and ground the negative terminal, the positive terminal is at a potential of +12 volts.

How safe is 48V?

What’s the difference between positive and negative 48 volt batteries?

But unlike traditional 12 and 24 volt systems which have the minus (-) side of the battery connected to ground (i.e. called negative ground systems), telecom batteries have the plus (+) side of the battery connected to ground, called a positive ground system, also designated as “negative 48 volt”.

What goes where on a neg 48 volt transmitter?

So you can imagine an installer standing there with a black wire in one hand and red wire in the other looking at the input terminals on a “neg 48-volt” transmitter that are marked “HOT” and “RTN” asking himself “What goes where?” Answer is: black to plus and red to minus, which is a bit counter-intuitive.

Why is-48v is used as power for telecom?

(iv) Negative voltage is safer for long telephone line for transmitting power trough it. The reson for electing -48V in reference to ground is to avoid the nasty galvanic effects in telephone cabling. +48V would have nastier effect on wet cabling. Its shortly satisfied answer.

Why was 48 volt chosen as the system voltage?

Back in the day, when Telephony equipment was being developed, 48 was the chosen system voltage because it’s considered safe “low voltage”, and reduced amperage requirement of equipment powered at this voltage. This allowed use of smaller gauge wires, while still being capable of carrying power…