It happens on the regular 450 AP too. 1000Base-T does not work at all
with GigE-APC-HV's in line. It is 100% the sync pulse causing the SS to
clamp.
I won't speak for Chuck, but he sent me some stuff to test and it works.
This was a yet unused 5GHz 450 AP at a site with ~220 feet of Shireen
DC-1021. No SS on top. GigE PowerInjector+Sync fed with regulated 24v.
I have GigE-APCs on tons of POE and non-POE gigabit links *without a
sync pulse* and they work perfectly fine. It would not surprise me if
other brands of suppressors are doing the same thing because of the sync
pulse. Maybe it takes the right conditions like temperature, power draw,
etc. It's just immediately obvious with the GigE-APCs because they are
moar betterer.
On 10/3/2016 12:45 PM, Forrest Christian (List Account) wrote:
We have very recently started getting a whole bunch of support queries
which are from customers maintaining a gigabit link on a 450i. The
link seems to come up at gig, then some time later drops back to 100Mb/s.
So far, we haven't nailed down a cause. Some seem to be related to
the sync pulse, others are completely unaffected by this. Some seem
to be related to the addition of a surge suppressor to the link (even
a good quality one), some not. I'm even aware of quite a few cases
where replacement of our gear with a stock cambium injector doesn't
fix the problem - so I'm pretty comfortable in feeling that something
other than our power injection equipment is the root cause.
The commonality of most of these are longer cable runs. All of the
normal things have been tried (swapping cables, reterminating ends,
validating cables, etc.). I also suspect that these are newer
450i's. (I'm not sure if we've seen this on a 450 or not).
So, what I'm hoping for from the list is to determine if this problem
is widespread, and if there seems to be any relation to how old the
450i is, or a firmware version update, or something else so I can help
fix this for my customers. Any information would be helpful.
--
*Forrest Christian* /CEO//, PacketFlux Technologies, Inc./
Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602
forre...@imach.com <mailto:forre...@imach.com> |
http://www.packetflux.com <http://www.packetflux.com/>
<http://www.linkedin.com/in/fwchristian>
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