So you shift the on-board pulse based on what you see on the power port?
That's pretty cool. Walk over and tell the Canopy guys to do that.
Stupid question.. why the hell is there a difference between the CMM3 and 4?
On 6/9/2015 5:10 PM, Dan Sullivan wrote:
Hi Forrest,
For ePMP if you are using a CMM3 timing source and you also have the
on-board GPS enabled for that ePMP, then this will produce the same
timing of the on-board GPS alone or the CMM4 alone (or the CMM4 and
the on-board GPS enabled).
Hopefully, this will provide you the flexibility you need.
Daniel Sullivan
ePMP Software Manager
Cambium Networks
Cambium Networks Community Forum <http://community.cambiumnetworks.com/>
*From:*Af [mailto:[email protected]] *On Behalf Of *Brandon Yuchasz
*Sent:* Wednesday, June 03, 2015 10:44 PM
*To:* [email protected]
*Subject:* Re: [AFMUG] ePMP sync differences CMM3 vs CMM4.
Forrest,
What’s the down size of making the change for you?
Best regards,
Brandon Yuchasz
GogebicRange.net
www.gogebicrange.net <http://www.gogebicrange.net/>
*From:*Af [mailto:[email protected]] *On Behalf Of *Forrest
Christian (List Account)
*Sent:* Wednesday, June 03, 2015 3:22 PM
*To:* af
*Subject:* Re: [AFMUG] ePMP sync differences CMM3 vs CMM4.
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
<[email protected] <mailto:[email protected]>> 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)
<[email protected] <mailto:[email protected]>> 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
[email protected] <mailto:[email protected]> |
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
[email protected] <mailto:[email protected]> |
http://www.packetflux.com <http://www.packetflux.com/>
<http://www.linkedin.com/in/fwchristian>
<http://facebook.com/packetflux> <http://twitter.com/@packetflux>
