Yes, you might have heard about this paradigm many times, a -48v supply to any equipment, specifically a telecommunication equipment, which is all set to work at -48v only. If the question ” why -48v” moreover ” why negative” ever scratched your head, then you landed here on the right place. Today i am going to tell you why -48v standard rating is chosen for equipment, at the same time i will also elaborate the basic concept behind “negative voltage” so here we go.
You must have read in your engineering course, the DC (direct current) does not generate noise on the line and can be easily generated from regular lead acid batteries which are generally used in vehicles.
1) Low Voltage are safer for telecom technicians and service personnel.
2) 48v is just enough n efficient for transmitting power through telephone lines to a long distance.
3) A negative line voltage helps to reduce the corrosion from electro chemical reactions occurring on a wet telephone line.
Now you have learned technicality behind -48v supply, go and Bragg with the world. let us know if you have any other answer to share for this.
The utility and power has always been the critical aspect in telecommunication network, while power failure contributes the majority of outage in network, you really can control power outages if you do not have strong power backup. Although the developed countries does not face any power related failures in telecommunication network, but for countries like India, the power plays important role.
The BTS site has power backup of as long as 12 hrs which can be extended to anything depending upon the fuel availability via Generators. The power consumption by various telecommunication equipment’s contributes to overall load, More are the number of connected equipment’s more would be the power consumption and less will be the power backup.
One of the major pitfall that is observed in telecommunication field is, during power failure, the Indoor Air conditioners are powered off, due to which equipment gets heated and contribute to network outage, this also degrades the performance of equipment in longer run.
Telecom operators are in verge to find alternatives to power backup, recently operators in India deployed solar panels on BTS sites to fulfill backup needs, Solar Panels being costly can be only deployed on hub sites where dependency of network is huge.
Transmission equipment’s are configured to operate at lower voltage in order to ensure high network uptime, LVLD are the settings that are done to avoid network failures by shutting non critical devices during power failure, which saves the power which is then utilized for transmission equiments.
So, you might have already got basic idea about how telecommunication power system works and role of -48v, if you are working in telecommunication sector, it is one of the important question that is asked in every interview. We will try to cover more interview questions in detail, to clear your basics for which we will be also seeking your inputs. All you need to do is place your queries and we will digg deep to get you the answer.