OK, now I'm very interested. I have multiple sites with regular 10/100
SyncInjectors with 450 APs on them (no need for GigE). They're all on
200 feet or more cable. Randomly, all APs at a site will show loss of
power port sync. More often, they say the sync pulse is flip flopping on
and off. Sometimes a reboot or a power-cycle will fix it, but mostly
just have to wait a few minutes for it to clear. This seems to happen
right around sundown most times. I was thinking that the on-board GPS
starts freaking out and triggers some AutoSync bug (which I know
exists). I've pulled out all surge suppressors, swapped SyncInjectors,
SyncPIpes, nothing. And when this happens, the SyncInjector status says
the timing is fine, no events, every time.
But maybe this is actually my problem?? It has been very very rare on
shorter runs (like <150 feet).
On 11/9/2015 5:20 PM, Forrest Christian (List Account) wrote:
Sort of.
First of all, a normal pulse out of a syncinjector into a short cable:
Inline image 5
Interesting things happen when you shoot this into a long cable:
Inline image 1
Those bounces at the front are my best guess as to what is causing the
450i to not like the sync pulse. That's on a 100m cable, and those
pulses are most likely caused by the signal bouncing off the end of
the cable and back and/or some different interaction with a long CAT5
cable. It should be noted that similar bounces also happen with the
100 and the 450, and even with official cambium sync sources (aka the
CMM Micro), but the software in those radios seem to ignore the stray
pulses, only paying attention to the final edge. Not so with the
450i. It just refuses to play.
The new I0 injectors turn the power off a bit more smoothly, making
the bounce not exist, even on a long cable:
Inline image 4
On Mon, Nov 9, 2015 at 4:02 PM, George Skorup <[email protected]
<mailto:[email protected]>> wrote:
Let me guess, they only take a CMM4 aligned pulse?
On 11/9/2015 4:21 PM, Forrest Christian (List Account) wrote:
We have recently become aware of a potential issue when using a
SyncInjector with a PMP450i. The short version of this issue is
that with certain cable runs (mostly longer ones), a PMP450i will
refuse to accept the sync from the SyncInjector as valid, even
though the pulse is perfectly valid and should be accepted by the
PMP450i.
Currently, there are two ways this can be fixed. Since the
pulse is valid, but just not recognized as valid by the currently
shipping PMP450i firmware, Cambium could fix this in software.
I believe they are currently investigating this as an issue, and
I honestly expect them to release a fix assuming it isn't a major
issue to do so. If this happens, it should address all of the
existing SyncInjectors in the field which our customers may want
to use in the future with a a PMP450i.
The second way to fix this issue is for us to modify our sync
pulse slightly so that it is in line with what the PMP450i is
expecting. Because this modification has some additional
benefits beyond better interoperability with the current PMP450i
firmware (such as the modified pulse being less likely to induct
noise into adjoining cables), we have decided to proceed down
this path as well.
During the next week or so, we will begin shipping Revision I0 of
our Gigabit SyncInjector Product. The first of these are
currently working their way through our assembly line. This
version contains improved support for voltages above 58V and also
the waveform modification mentioned above. It should be
functionally identical to the earlier Revision H0
SyncInjectors. It is not our intention to update our
non-gigabit injectors at this time.
If you are currently having problems with sync over power on a
Gigabit SyncInjector and a PMP450i, please send an email into
[email protected] <mailto:[email protected]> and we
will work with you to ensure you have hardware which will work
with your hardware.
--
*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.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>
