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I recently bought a used NetOptics TP-GCU-48V network tap on eBay for use on my home net. This is one of their earlier models and has been discontinued for a number of years. They have two versions (AC or DC power input) of this model and the one I bought requires -48VDC power.
Per the spec sheet (http://www.network-taps.eu/products/prod_data/125/IG%20-%20TP-GCU.pdf), the two version (AC and DC) use the following power.
AC Power Supply:
Input: 100-240VAC, 1.5A, 47-63Hz
Output: 12V 5A
DC Power Supply:
Input: -48V DC
-36V DC min,
-75V DC max
Terminal Block Pinouts
Left: Ground
Center: -48v
Right: Positive
Now I can find 110VAC to 48VDC converters on eBay but none of them say -48VDC. So first question is, what exactly is -48VDC and how does it relate to 48VDC? Secondly, the spec sheet does not mention amperage for the DC power. The converters on eBay range from 200mA up to about 700mA. Do amps not matter with DC power and that's why the spec sheet doesn't mention it?
I've contacted NetOptics but haven't heard back so I'm hoping someone on here is familiar with either this piece of equipment or just power supplies in general and can give me an idea of the appropriate converter to use. Thanks.
48V dc refers the potential difference between the positive and common terminal, and so the potential difference btn negative and common terminal is -48v. – None – 2015-11-28T18:05:43.863