DC to DC telecom PDU

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LRL
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DC to DC telecom PDU

Tue Jan 29, 2019 3:19 am

As we've started to deploy more BIG carrier type radios one of the struggles is powering them. Yes we can deploy a regular -48v teleco UPS and power these radios from it, but most reasonably priced (cough not) don't give you the options to power cycle a radio or turn it off remotely.

Our home-brew has been to use a RB750 or a Netonix to actuate relays to do the basics of on or off. But it could be so much more helpful to have power draw info with a nice configurable power UI like the DC switches.

Honestly a similar concept to UBNTs edge power, but with at least 4 DC output terminals. The way we build our sites a variable DC input would be preferred but I could see some pretty good potential for an AC option. You could actually get really fancy and integrate this all into a reasonably priced telco UPS (with cust supplied batteries). Some of the radios we've been using are power hungry though, 130-140 watts. When you start using multiple RTUs on the same dish with layer1 aggregation powering these types of links messy.

I've had a lot of discussions with other operators and it seems to be the trend that more and more are starting to use DC switches even at AC sites and then use AC to DC converters to power and charge their own battery bank. This really makes a ton of sense, you get voltage monitoring of the bank and should the power be off long enough you can pre-set the switch(es) to make intelligent choices to power down radios to limp the site along. Or in the case of all CPEs being powerless, turn APs off to keep backhauls up longer. Add multiple AC to DC converters and suddenly you have yourself a pretty solid DC UPS and for a fraction of what's commercially sold.
-LRL

"My reading of history convinces me that most bad government results from too much government." - Thomas Jefferson

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Dave
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Re: DC to DC telecom PDU

Tue Jan 29, 2019 9:20 pm

LRL

What voltage/current range would each of the DC output terminals need to be?

Dave

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Re: DC to DC telecom PDU

Wed Jan 30, 2019 2:39 am

Dave,

I had the silent internal argument about voltage, but honestly I can't see a need for anything but 48~ volt. For resistance (voltage drop) probably a little higher (49-50) as I can't remember a radio that does have a range of at least 45-50. We've got some radios that are right under 150 watts, so I suspect 3amp would be enough, but 4 gives some wiggle room for long runs and such ;)
-LRL

"My reading of history convinces me that most bad government results from too much government." - Thomas Jefferson

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