You put + and – on the 4/5 pair and also on the 7/8 pair rather than both neg
on 4/5 and both positive on 7/8.
From: Eric Muehleisen
Sent: Tuesday, April 21, 2015 1:31 PM
To: af@afmug.com
Subject: Re: [AFMUG] CAT5 crosstalk on tower legs
That's it! It's coming back to me now
A while back there was a thread about issues running CAT5 cables along the
entire length of solid steel tower legs.
We've run into a problem where we can't run 100baseT reliably on a couple
APs. CRC errors will go away if we force the switch port to 10baseT.
Interestingly enough, packet loss
LMG discovered this about 10 years ago or whenever their first sync product
came out. The fix was the balanced sync over power wiring schema.
From: Ken Hohhof
Sent: Tuesday, April 21, 2015 1:24 PM
To: af@afmug.com
Subject: Re: [AFMUG] CAT5 crosstalk on tower legs
The thread about Cat5
Damn near every tall tower I've done straight up the legs and zip tied
right onto the legs.
Grab shielded cabling and do it again, I bet you have water in the line.
Double check your connectors at the bottom for corrosion or water.
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100
years ago or whenever their first sync
product came out. The fix was the balanced sync over power wiring schema.
*From:* Ken Hohhof af...@kwisp.com
*Sent:* Tuesday, April 21, 2015 1:24 PM
*To:* af@afmug.com
*Subject:* Re: [AFMUG] CAT5 crosstalk on tower legs
The thread about Cat5 ziptied
We are using shielded cable with the drain wire grounded. Also, we are
collocated with a 2-way transmitter. It runs at 400mhz. We confirmed today
that it's not interfering because we still took on CRC's with it powered
off.
We have verified that there is no visible water in the cable. The ends
','af@afmug.com');
*Subject:* Re: [AFMUG] CAT5 crosstalk on tower legs
Damn near every tall tower I've done straight up the legs and zip tied
right onto the legs.
Grab shielded cabling and do it again, I bet you have water in the line.
Double check your connectors at the bottom for corrosion
: [AFMUG] CAT5 crosstalk on tower legs
That's it! It's coming back to me now. This is affecting only Canopy APs with
sync over power going into a CTM2.
What would be the best wiring or pin out method in this case?
On Tuesday, April 21, 2015, Chuck McCown ch...@wbmfg.com
mailto:ch
The last time we had this kind of problem, we were using timing-cable
sync. When we (1) switched to sync over power, and (2) added low-pass
ferrite toroids, the problems went away.
bp
part15sbs{at}gmail{dot}com
On 4/21/2015 12:27 PM, Eric Muehleisen wrote:
We are using shielded cable with the
This is with Cambium gear?
The issue is the sync over power creates enough of a inductive spike to
cause CRC errors. The fix is either to separate the wiring from the
tower steel, provide sync over the sync port at the AP, use the internal
sync on PTP450, or swap one wire from each of the
The thread about Cat5 ziptied to tower legs probably involved sync over power
and surge protectors.
From: Josh Luthman
Sent: Tuesday, April 21, 2015 2:12 PM
To: af@afmug.com
Subject: Re: [AFMUG] CAT5 crosstalk on tower legs
Damn near every tall tower I've done straight up the legs and zip
You've already checked for grounding issues and nearby 2-way transmitters
around 100-150mhz?
On Tue, Apr 21, 2015 at 2:05 PM, Eric Muehleisen ericm...@gmail.com wrote:
A while back there was a thread about issues running CAT5 cables along the
entire length of solid steel tower legs.
We've
switch to wbmfg GigE-APC-HV surge suppressors and you'll most likely get
ride of the errors ;-)
if not then you may need to run the ethernet lines in liquidtight conduit
(with the metal inside)...that was my project today at a tower with an FM
transmitter that was causing all kinds of problems
600SSD's
On Tue, Apr 21, 2015 at 4:26 PM, Matt matt.mailingli...@gmail.com wrote:
A while back there was a thread about issues running CAT5 cables along
the
entire length of solid steel tower legs.
We've run into a problem where we can't run 100baseT reliably on a couple
APs. CRC
A while back there was a thread about issues running CAT5 cables along the
entire length of solid steel tower legs.
We've run into a problem where we can't run 100baseT reliably on a couple
APs. CRC errors will go away if we force the switch port to 10baseT.
Interestingly enough, packet loss
Keep in mind the 450 already has tvss built into the interface on the
radio. we do not add additional ss near top.
we have not had any issues with cable errors since day one of deployment
of our 450 systems.
If you add additional ss on the lines especially long runs of 200' or
more expect crcs.
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