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#1
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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 of providing the power required for a telephone exchange with mains UPS type supplies are too high. I have seen the battery banks for an exchange and they are huge room sized things. Most high quality stuff has 48VDC options. You can get 48VDC supplies but unless you already have one I would forget it. They can be expensive and you probably don't need the hassle in a school. The only option option would be to get mains AC supply for the kit but again it could end up costing a lot more than its worth. Hope this helps, Steve JJ wrote: I'm a computer software guy and I don't know much about electronics. I need to buy a network switch for my children's school where I volunteer as a network admin. I found one on Ebay that meets my needs, except it says that it is the "48V DC" version of the switch. The manufacturer of this switch sells it as two different models, and this one is the "48V DC" version. What does that mean? Am I going to need to get something else to get power to it? |
#2
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48V DC - what does that mean?
I'm a computer software guy and I don't know much about electronics.
I need to buy a network switch for my children's school where I volunteer as a network admin. I found one on Ebay that meets my needs, except it says that it is the "48V DC" version of the switch. The manufacturer of this switch sells it as two different models, and this one is the "48V DC" version. What does that mean? Am I going to need to get something else to get power to it? |
#3
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48 volts (V) Direct Current (DC) as opposed to AC (alternating current)
"JJ" wrote in message ... I'm a computer software guy and I don't know much about electronics. I need to buy a network switch for my children's school where I volunteer as a network admin. I found one on Ebay that meets my needs, except it says that it is the "48V DC" version of the switch. The manufacturer of this switch sells it as two different models, and this one is the "48V DC" version. What does that mean? Am I going to need to get something else to get power to it? |
#4
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Don't bother with this one, look at Fry's Electronics and you could get a
switch for practically nothing that does plug right into the wall. "JJ" wrote in message ... I'm a computer software guy and I don't know much about electronics. I need to buy a network switch for my children's school where I volunteer as a network admin. I found one on Ebay that meets my needs, except it says that it is the "48V DC" version of the switch. The manufacturer of this switch sells it as two different models, and this one is the "48V DC" version. What does that mean? Am I going to need to get something else to get power to it? |
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