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jcem
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Posts: 137
Joined: Sun May 24, 2009 4:41 pm
Location: Grebbestad, Sweden

RB800 installation power requirement?

Tue May 04, 2010 1:51 pm

Hi!

I'm considering the following installation

RB800 10W - only in bridge mode
RB604
4 r52Hn avg 5W = 20W - They will run at 22dBm
1 r52n 2,4W

Total of ≈ 33W at 46V

Is this reasonable with 40meter POE CAT6 cable?
I know it's on the edge, but whats your opinion?

According to what I've read CAT6 can carry 12,5W/pair
so this will stretch it a little.

It's outside and temperature never goes
above 25°C

or

Should I run a separate 1 pair regular power cable for power?

Is temperature an issue in closed aluminum case with RB800
and 4 r52Hn?

I'm also considering using a RB600A instead of RB800
would that be enough for driving 5cards and a total of 100Mb TCP

Best Regards 8)
 
aaa
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Location: Latvia, Baltezers

Re: RB800 installation power requirement?

Wed May 05, 2010 10:50 am

Regarding power it's ok use 48V;60W POE injector. But about R52Hn I don't know. This card make many heat :))
 
0ldman
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Joined: Thu Jul 27, 2006 5:01 am

Re: RB800 installation power requirement?

Fri May 07, 2010 12:49 pm

I would advise against it.

Power issues not withstanding, as aaa mentioned, those cards get hot, really hot. I don't doubt that they can handle it, however, stacking them on top of each other is going to push it.

Also comes down to issues I've had recently of the radios interfering with each other. It gets pretty interesting running two cards in 2.4 and two in 5GHz on the same RB.

Depending on how my tower install goes in a couple weeks, my next will have a 411 for the feed and a 433 with 2.4 and 5 AP.

My current towers with loaded 600's, 2x 5GHz ptp shots, 2GHz and an extra, 5GHz interferes with each other unless the signal is really high.
 
jcem
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Topic Author
Posts: 137
Joined: Sun May 24, 2009 4:41 pm
Location: Grebbestad, Sweden

Re: RB800 installation power requirement?

Fri May 07, 2010 1:10 pm

How does this interference show? Where do you see that
you have interference?

I have one RB600 installation with 4 r52n cards and I haven't noticed any interference.

As to my question about the RB800 installation I've been running it in my office with
TCP Bandwithtest and 100%CPU on two cards and it gets warm, but not too bad. The Health Temp is
steady at 64°C

I'm not stacking the cards, but use 2cards on the RB800 and 3 on the RB604 extention

I'm using a an aluminum box and maybe it's better with transfer the heat?

RGDS
 
0ldman
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Re: RB800 installation power requirement?

Sat May 08, 2010 8:20 am

Signal level is an issue, but not the only one.

On my tower, RB600 w/4 R52H, 2 5GHz ptp, 2 backup cards, the two ptp radios show a significant drop in CCQ during load.

I am on tower two, tower three is the one in question, tower four is the last in line.

If I do a bandwidth test or any other load across from T1 to T2, everything is fine. If I load from T2 to T3, everything is fine. If I go from T1 through T2 to T3, T2 shows pretty nasty CCQ on the RX of both radios.

The physical separation of the radios by using the daughtercard helps, using the R52Hn with MMCX helps, may just be the N cards in general (no diversity switch), could be the MMCX connectors are better than ufl.

I have noticed that the N cards are better about self interference than the previous cards, and I've had less issues with the XR5 myself.

Just the info I've got.

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