Yes, their eNB has an on-board GPS and the kit includes an external
active antenna. 1588v2 is also supported. We've had some issues with the
GPS on a couple. Could be weird reflection/multipath issues or the
receiver going stupid. Haven't figured it out yet. Sometimes a reboot
will cure it if they lose lock. Got one that's a consistent pain in the
ass. We'll probably end up swapping that one to rule out a receiver issue.
On 9/7/2017 3:21 PM, Forrest Christian (List Account) wrote:
Doesn't Baicells have some sort of included/supported gps receiver?
On Sep 7, 2017 2:00 PM, "George Skorup" <george.sko...@cbcast.com
<mailto:george.sko...@cbcast.com>> wrote:
Baicells supports PTP and Cambium has stated the 450i and 450m
will get support at some point.
A future software update for the RackInjector that would give us
PTP would be cool. Another thing I hope to see is PDU-like cards
for direct DC/SFP radios, including -48 support for high-power
radios, even if the card had to have its own master/input like the
regular 5ch PDU.
Yeah, do the USB GPS. Then shut up and take my money. :) One of
the things I was actually thinking about playing around with is
PTPd on CentOS 7. Obviously it's just software, but it should be
sufficient for bench testing.
On 9/7/2017 5:39 AM, Forrest Christian (List Account) wrote:
I am mindful about 1588v2 - I just don't have an active market to
sell to right now, and the level of engineering there is a bit
more than I want to bite off unless I have a known market.
The usb to GPS device is easy to do, and definitely in the
category of a weekend project, which is why it is likely to just
happen.
On Wed, Sep 6, 2017 at 10:22 PM, George Skorup
<george.sko...@cbcast.com <mailto:george.sko...@cbcast.com>> wrote:
I'm down for buying a handful whenever you decide to make
something.
Output from the RackInjector management port and/or a
dedicated device could be extremely useful. Hmm. How about
ieee1588v2 PTP? That would be cool.
On 9/6/2017 10:34 PM, Forrest Christian (List Account) wrote:
My rough draft here is a USB-serial interface with an
isolated DC-DC converter and a isolated usb-serial
interface, so you are at least mostly electrically and opto
isolated from the SBJ. Plug into a USB and then power the
SBJT. So USB to a small box, then cat5 to the SBJ. This
is a small enough and fun project that it will probably just
happen and fairly quickly - I need a few of these after the
nightmare of the rackinjector (think of it as a working
vacation).
I've also had on the todo a NTP all in one appliance,
probably in the SBJ or SB12 box. That same code would make
it into the rackinjector and any followon similar products.
There are quite a few things ahead of it on the roadmap
though...
On Wed, Sep 6, 2017 at 2:45 PM, George Skorup
<george.sko...@cbcast.com <mailto:george.sko...@cbcast.com>>
wrote:
Apparently there are USB sticks that are basically a GPS
receiver and a PL2303 for $30-40. So you get the
date/time. Cool. Then they take the 1PPS output to blink
a f***ing LED. Really!? I was reading some blogs where
folks have opened them up and wired a super tiny jumper
from 1PPS to DCD. That was about 5-6 years ago using
older SiRF receivers, too. Meh.
A GPS+GLONASS SBJ basic and USB kit would be pretty
cool. Could the USB interface also power the box, up to
say 20-25 feet? The other thing is, all of the machines
I'm working with have a serial port. So maybe just skip
the USB altogether?
I was thinking, maybe take the daisy-chain output from a
SyncInjector/PowerInjector/RackInjector since those
switch the pipe/box to NMEA anyway, but I don't think
I'd want a path from the tower-mounted gear to
server(s). And other funky stuff like noise making it
into the timing for the radios would be ungood.
On 9/6/2017 2:10 AM, Forrest Christian (List Account) wrote:
I could tell you how to wire a syncbox junior up to a
usb port if you'd like. Requires a TTL level usb to
serial cable.
I'd you wait a month or so until the gps+glonass
version is out it well even speak nmea. Heck, now I
think about this it might make a good product....
syncbox basic plus a USB dongle.
On Sep 5, 2017 8:19 PM, "George Skorup"
<george.sko...@cbcast.com
<mailto:george.sko...@cbcast.com>> wrote:
I've got a few CentOS machines running around the
network doing various tasks, one being NTP for
radios, routers, switches, etc. I've been having
some issues with us.pool.ntp.org
<http://us.pool.ntp.org> lately. I switched to
time-(a,b,c,d).nist.gov <http://nist.gov>.
Apparently those are pretty busy.
So is anyone else using GPS to feed NTPd? From what
I've been reading, I guess I need a 1PPS capable
receiver. Does that exist in a simple USB package?
That would be ideal, preferably with an SMA female
for an external antenna where needed. Looks like
none of the cheap shit I'm finding on Amazon has
PPS output.
--
*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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<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>
