Re: Power Requirements for a BR350?

pkranz · ‎03-31-2003

I have several outdoor sites with multiple BR350's in the same cabinet. In a drive to clean everything up, I am moving to rack mounting everything in Purcell NEMA cabinets. I plan on removing all of the the 'wall-wart' power supplies and replacing them with a single DC power source hardwired to all of the power injectors. In spec'ing these supplies, I have not been able to determine the power requirements of the BR350's.. I know that they need -48V, but how many amps per radio should I specify?

derwin · ‎03-31-2003

This would not be supported and if you have a hardware problem it may create problems in getting an RMA at a latter date

A much better solution would be to use an in line power enabled switch then you can remove the power injectors all together

moebiusds · ‎03-31-2003

Doesn't it seem like a 24 port catalyst might be serious overkill for 2 or 3 radios sitting in an outside enclosure? The need is only for 4 or 5 ports.. Does cisco offer a PoE solution for these small scale deployments?

derwin · ‎03-31-2003

Yes I see your point for only 4 or 5 devices

For upto 16 devices if you already have a 2600 3600 or 3700 you can get a 16port Network module that can support inline power

For a low number of devices then the solution is the power injectors but these can be inside where the switch or hub is and not outside with the bridge as long as you comply with the 10baseT specs ie less than 100 Metres cable length.

moebiusds · ‎04-01-2003

Just to give a little more perspective.. I have the same situation in several locations.. On remote sites, i.e. mountain top, I have have a NEMA enclosure with AC next to a radio tower. Inside the NEMA enclosure is a 1U UPS, a 1U 8 Port switch, 1 BR350 for an backhaul radio, and 3 BR350's for sector radios, and 4 Amps to boost the BR350s signal to the sector panels and back-haul.

With this configuration I have 4 BR350 wallwarts, and 4 AMP wallwarts.. Between the AC cables, dongles, etc.. this configuration takes up a large component of the NEMA enclosure.

So in order to get rid of 8 wallwarts, I am planning on using a -48V DC source that has enough capacity to power all 8 devices, snipping off the wall warts, and wiring them to the DC source. If I use two DC sources in parallel I can even have a HA DC solution.

All I need to know now is how many watts a BR350 consumes to spec the power source...

macraies · ‎05-08-2003

I'm also trying to find out the watts required as I need to design a solar/wind/battery power supply for a mountain top location. The hardest part so far is actually finding what the power consumption of these Bridges are. No docs seem to say and looks like no one wants to say either. Anyone actually know?