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To prevent the equipments from lightning strokes. Because the cloud is negatively charged at bottom it requires a zero or a positive potential to discharge, and it selects the ground (Zero potential) to discharge. If the Telecom Equipments are fed with positive the cloud will choose the low resistance tallest positively charged Antenna's to discharge, this could damage the entire setup of Telecom equipments. So the Telecom equipments are fed with Negative supply Voltage.
Wiki User
∙ 14y ago
Wiki User
∙ 10y agoMost of the land line telecom networks are copper or iron wire exposed to air. These materials are negatively charged ion and easily get reaction with positively charge ion and erode the copper wire. To minimise the erroson of copper wire -ve voltage terminal is fed in the external wire.
Wiki User
∙ 12y agoThere is no such thing as a 'negative' or 'positive' voltage, in the sense of electrical charge. Voltage is another term for potential difference. Your question should be, "Why a negative potential is used in telecoms?"
Wiki User
∙ 12y agobecause if we charge the line with negative charge it wont rust and it will last longer
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What is the type of current used by GSM Telecom Equipment?
dc
Why telecom equipment used 48v?
48 volts is a convenient safe voltage to use, and telephone systems use a positive earth connection to minimise electroytic damage ot cables.
Why plus 24 volt is used for telecom equipments?
+24 volts is not normally used for telecom equipment. -48 volts is the usual value. 48 was chosen as a compromise between safety and voltage/power efficiency. Minus was chosen over plus to manage corrosion effects of cabling in underground installations.
Why are there positive and negative wires when stimulating nerves?
The most likely explanation is that the equipment used to stimulate the nerves uses a DC voltage to do so.
Why -48v dc used in telecom equipment regent for ansar?
This voltage is supplied by large banks of lead-acid batteries at the central office. There are 24 cells in each battery, giving 48 volts. Grounding the positive battery terminal makes the delivered voltage negative. Batteries are used so the system can keep operating (for a period of time) during a power failure, so that emergency and other important calls can still be made.
What is negative 48 volt DC voltage?
Negative 48 volt DC voltage is simply a voltage that is negative 48 volts with respect to ground. This voltage is widely used in telecommunication systems.
Why telephone line has negative voltage?
A negative live voltage is used to prevent electroytic corrosion on the copper wires.
Why -48 volts is used in electronics?
-48V is used in the telecommunication equipment. The source of the -48V is a bank backup batteries that are always kept charged in the event of power loss. The typical range of voltage is -36V to -60V in this application. Why negative voltage is used is probably tradition as the modern power supplies that use this voltage are isolated and run the same as long as the positive terminal is 48V above the negative terminal.
How do you get negative voltage from transformer?
The term, 'negative voltage', refers to its direction and has nothing to do with 'negative' in the 'charge' sense. It's used to indicate the direction in which a voltage is acting in relation to another voltage ('positive' if acting in the samedirection; 'negative' if acting in the opposite direction). So your question is confusing: 'negative' in relation to what?
Why do you use negative voltage in vibration measurement?
Because the vibration measeure ment uses the RF, so to avoid interference the negative voltage is used
What is the voltage of portable power equipment used on a building site?
230v
What is negative boosters used in traction?
negative boosters are used in the return path of traction system It is to decrease the voltage of the return path and to ensure that the return path voltage is much closer to ground potential
