Radio Constantly Crashing

Hello all,

I am having problems with a Tranzeo TR-4500 constantly crashing requiring a
hard reboot. It was doing this sporadically earlier but it has been
happening more-so after we've increased the length of our (shielded) CAT5
runs from the ground to the radios to a bit less than 100m. There are
three of these radios on the tower with the one that is crashing the
busiest of the three (most # of CPE's, most amount of traffic). I'm
wondering if anyone has had similar problems with these radios? One of
our concerns was whether it is the POE adapters that do not have the
ability to send a steady stream of power to the AP? The adapter is a 24V,
1A. There is a link from the bandwidth shaper on the ground to each
of the radios at the top with each link being a bit less than 100m. The
POEs are on the ground and they are the standard Tranzeo POEs.

Any ideas as to why the AP's keep crashing?

Thanks in advance,
Kevin Brown
www.wavedirect.net

Kevin Brown <itismekevinb-NOSPAM-@hotmail.com> hath wroth:

>I am having problems with a Tranzeo TR-4500 constantly crashing requiring a
>hard reboot. It was doing this sporadically earlier but it has been
>happening more-so after we've increased the length of our (shielded) CAT5
>runs from the ground to the radios to a bit less than 100m. There are
>three of these radios on the tower with the one that is crashing the
>busiest of the three (most # of CPE's, most amount of traffic).

Are you supplying power to these three radios individually, or over a
common pair of wires?

>I'm
>wondering if anyone has had similar problems with these radios? One of
>our concerns was whether it is the POE adapters that do not have the
>ability to send a steady stream of power to the AP? The adapter is a 24V,
>1A. There is a link from the bandwidth shaper on the ground to each
>of the radios at the top with each link being a bit less than 100m. The
>POEs are on the ground and they are the standard Tranzeo POEs.
>
>Any ideas as to why the AP's keep crashing?

1. Doing the math... CAT5 is 3 ohms per 100ft per conductor. 100
meters would be about 9 ohms. Double up on the conductors and the
loop resistance (2 sets of wires) is 9 ohms.

I couldn't find any data on the TR-4500 on the new and almost useless
Tranzeo web pile. More art and Javascribble than content. Data
sheets on older products are totally missing.
http://tranzeo.com/products/docs/
Do you have the required voltage and current for the TR-4500 handy? If
so, do the Ohms Law calculation to see if you get enough voltage to
the TR-4500 (or supply the numbers and I'll do it).

Also, don't assume that your 24V 1A power supply is supplying exactly
24 Volts. Under load, it might be considerably less. It seems like
this should work but Tranzeo FAQ weasels out of the calculations by
supplying this piece of useless manure:
"If you are running Less Than 100ft of Cat5e cable to your
TR-5800 series radio, a 18v adapter should be used. If you are
running Greater Than 100ft of Cat5e cable, 24v adapter will be
needed."

Got some real numbers for the TR-4500? You may have to measure the
operating current as the other data sheets don't show any power
requirements.

2. I've had some nasty RF problems with home made PoE systems at
polluted mountaintop sites. The major culprits are TV and FM
xmitters. Also 930MHz paging transmitters. I've had to do some
shielding and bypassing at the AP end on the tower to keep the RF out.
I don't think the AP shielding did anything useful, but ferrite beads
and bypass caps on the PoE leads did wonders. I recently installed
overpriced shielded CAT5, which seemed to also help. Oh, the symptoms
were a very high error rate and erratic loss of connections. No hangs
or crashes.

--
Jeff Liebermann (E-Mail Removed)
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558