I wonder if this affects the 450 at all. I have a site with funky GPS
problems from time to time. Two 5GHz 450 sectors back to back on the
same freq. Each have their own Parasitic pipe. Sometimes one will lose
sync on the timing port and switch to on-board. The other is still
happily running on the timing port. I had an SM that could NOT see the
beacon from the AP that was facing right at it, so it tried to
registered to the other sector at -88dbm. This tells me the timing
between the G pipes and the 450 on-board GPS is slightly different, even
though it's the same damn receiver. Cambium must be delaying the
on-board pulse to match the CMM4 because this is exactly what it looks
like is happening here. Well, I assume the SyncPipes are lined up with
the CMM3, right?
So yeah, I'd say give us the option in the SyncInjector firmware. Can't
hurt to have it.
On 6/3/2015 3:21 PM, Forrest Christian (List Account) wrote:
I agree...buy lots of packetflux gear instead. ;)
I guess my implied question was more: "Since the ePMP seems to treat
the internal GPS and CMM4 timing identically, and the syncinjectors
produce CMM3 timing which creates additional complications in mixed
internal GPS/Syncinjector network, is there value in me bothering with
a switch to switch between CMM3 and CMM4 timing in the syncinjectors?".
The situation I see is where you have a network with syncinjectors,
and for whatever reason the sync source fails on one of the
injectors. You go into the ePMP and tell it to use the built-in
GPS. Now you're in the situation that you have to go and mess with
front and back settings to match the recommendation in the manual
since the AP's you just switched are now on the opposite timing. If
the syncinjector could be set to CMM4 timing, this wouldn't be
necessary - swap the sync source, and you're still good to go.
-forrest
On Wed, Jun 3, 2015 at 2:13 PM, Josh Luthman
<j...@imaginenetworksllc.com <mailto:j...@imaginenetworksllc.com>> wrote:
>Thoughts?
Don't buy a CMM4.
Josh Luthman
Office: 937-552-2340 <tel:937-552-2340>
Direct: 937-552-2343 <tel:937-552-2343>
1100 Wayne St
Suite 1337
Troy, OH 45373
On Wed, Jun 3, 2015 at 4:07 PM, Forrest Christian (List Account)
<li...@packetflux.com <mailto:li...@packetflux.com>> wrote:
On the cambium ask the synchronization experts thing I'm doing
someone pointed out the section in the ePMP manual talking
about frequency reuse. I had to go look since I had somehow
missed that section. In case you haven't seen it, there's a
deep discussion about the proper settings when you have a
"mixed" network of internal GPS, CMM3 and CMM4. (See Page 94
in the current release). I admit my ignorance and I hadn't
seen this yet, but.....
All I have to say is this: WTF Cambium?
Ok, I know the dirty little secret that the CMM3 and CMM4
produce different timing pulses. Obviously different enough
that it matters in the ePMP world. But the difference is
easy enough to fix... add a fixed amount of delay which
varies based on the timing source. They already have to
delay the GPS timing signal to match the CMM4. Why not
delay the two sources which are 'early' to match the 'late'
source? Or even better, fix the CMM4 so it matches every
other sync source on the planet - I'm shocked this hasn't
already been done. Ok, I get it, it might be a hardware
limitation which prevents one or both of the solutions. But
come on, really?
For the record the syncinjectors currently produce "CMM3"
timing, not "CMM4". Since it's obvious that the difference
matters now, I'm considering adding a software witch which
allows this to be configured so you don't have to deal with a
'mixed' timing source since it seems like a CMM4 and internal
GPS are identical. This should permit better operation when
you have to switch between an internal GPS and a SyncInjector.
Thoughts?
--
*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>
<http://facebook.com/packetflux> <http://twitter.com/@packetflux>
--
*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>
<http://facebook.com/packetflux> <http://twitter.com/@packetflux>
