As far as I know, the PMP450 has the internal antenna, ePMP does not. I
can tell you that without the antenna attached, the one I had on the
bench the other day did not see any sats.
Jeremy: Yes each GPS Sync ePMP comes with a GPS antenna. It's a
magnetic puck type like you would stick on top of a car, but It goes
onto a steel plate in a pocket on the top of the Cambium sector
antenna. You should buy one of Cambium's sectors and an AP before you
consider third party antennas btw, the cambium one has a couple of
convenient features (like the GPS antenna pocket) that I don't think
anybody has duplicated yet.
They don't all have to see the same satellites. You can use a mix of
sync devices. You can change the sync source remotely via the web GUI
if you have more than one connected.
It has been asserted (I think by Packetflux) that you could get minute
timing differences if you use two different sync sources at the same
site. I'm not clear on how terrible of a problem that would be, but I
know lots of people end up with a mixed bag of timing sources for one
reason or another. Like when you add that 5th AP but forgot that you
only had a 4 port sync injector.
the APs come with an antenna for GPS, but its never been clear to me
whether there is also an internal patch
On Thu, Sep 25, 2014 at 4:31 PM, Jeremy Grip via Af <[email protected]
<mailto:[email protected]>> wrote:
So would you be able to switch over to the onboard sync remotely?
Do you need an antenna for each AP for using it? Do you think it’s
as precise as using an CMM4 (or SyncPipe Deluxe w/Gig Injector) if
not as robust? If all POPs are sync’d with same Up/Dn ratio and
max cell distance and they’re talking to the same birds, is it
pretty much the same?
*From:*Af [mailto:af-bounces+grip
<mailto:af-bounces%2Bgrip>[email protected]
<mailto:[email protected]>] *On Behalf Of *Adam Moffett via Af
*Sent:* Thursday, September 25, 2014 2:55 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [AFMUG] Cambium Newbie Question
.....also the PMP100 SyncInjector from Packetflux ought to work
with ePMP. You might want the gigE version, but in the real world
with a mix of subscribers at different MCS levels I'm not sure how
likely you are to exceed 100x100.
The CMM4 is a much more rugged beast. It is expensive, but you
are not likely to go back and wish you'd bought the cheap one.
My plan is to hook up the internal GPS and have it available, but
also to provide sync over power. Once you are using GPS sync to
re-use channels it becomes critical that it's always working, so
better to have two timing sources available IMO.
They have built in GPS if youre on a budget, not sure why alot
of people are so die hard against using it
On Thu, Sep 25, 2014 at 12:56 PM, Jeremy Grip via Af
<[email protected] <mailto:[email protected]>> wrote:
I’m looking at ePMP w/channel reuse from a cost-comparison
standpoint. Trying to figure out how much I need to spend on
GPS synch for a 4 AP/ 2 channel cluster. Does it need to be a
CMM4? I will want to be synching multiple POPs…
Jeremy Grip
North Branch Networks,LLC
--
All parts should go together without forcing. You must
remember that the parts you are reassembling were disassembled
by you. Therefore, if you can't get them together again, there
must be a reason. By all means, do not use a hammer. -- IBM
maintenance manual, 1925
--
All parts should go together without forcing. You must remember that
the parts you are reassembling were disassembled by you. Therefore, if
you can't get them together again, there must be a reason. By all
means, do not use a hammer. -- IBM maintenance manual, 1925
