We have to many radios on our towers. I wish to have a GPS Synchronisation like Motorolla PTP600. With that I can put a lot more radius on our towers
Yes we need this for our sectors.
I think everyone needs this.
another vote.
Ubiquiti has it. We should have it.
This has been a long standing request from many people. My company’s network is really starting to feel the strain without this feature. Self interference is starting to become one of our biggest challenges at our distribution tower sites.
+1 Vote for GPS Sync
Google earth cannot give you the actual location?
it’s not about position, it’s about time
Yep it takes the time from the GPS and syncs the timing inbetween is access point at that location. Each access point takes turns using the same frequency. This enables the WISP to make use of the frequency more efficiently. Plus you can use 20-40 channels when you couldnt before because you maybe have sectorized for reliability.
i vote by this ++++ Timing syncronizaition.
for not doing much hardware change I suggest a software that can generate the clock and the other that can connect to it and synchronize their clocks
Thanks for the support guys
Actually, it makes all access points transmit at the same time, and listen at the same time. This keeps them from desensitizing each other. It also allows access points with signal paths that don’t overlap (from the client’s point of view) to use the same frequency and polarization.
Since the radios don’t have to worry about desensitization, they can also be placed right next to each other.
Desensitization analogy: If you are trying to hear someone shouting really far away, while someone right next to you is shouting (even if they are facing away from you), you won’t be able to hear the far-away person, even if one is shouting in a low pitched voice, and the other is shouting in a high-pitched voice. If they are far enough apart in pitch (frequency), you might be able to make out what the far-away person is saying, but with more difficulty than if they weren’t speaking at the same time.
I understand Desensitization now. Where are you getting your facts? Where can I read about this? I would like to learn more about what your talking about.
I found docs on that type of gps sync. I like how that gps sync works. I. Vote for that type. I will post the facts later when I am not traveling. Thanks xxiii!
i vote for this too.
Some of it comes from familiarity with another vendor’s system, and their documentation.
Here is an article about desensitization: http://en.wikipedia.org/wiki/Desensitization_(telecommunications)
Thank you
Normis, is mikrotik working on this solution? I will beta test.
There is no need for a GPS unit to localy synchronize transmitters. A simple coax cord chained between radio units of the same tower is enough if a global sync reference between towers of different sites is not needed.
For this to work, radios need something like a 10 Mhz clock output, and 10 Mhz clock Input to daisy chain. If the chain is long, then it’s better to have a master clock distributed through a splitter, to avoid added jitter at each node (and phase difference because of cable lenght).
For global synchronisation between tower sites, a central NTP server synchronized to the Atomic Time, and an optimized PPL loop associated to a high precision local Quartz oscillator and NTP client should be enough to keep sync.
The GPS or NTP server is only necessary if global synchronisation is mandatory, like in a GSM network or SDH synchronous network.
I think that removing the GPS unit, it should be possible to design lower cost sync radios than Ubiquity ones.
With or without GPS, for global sync, the most important part is the precision of the local oscillator, and the design of the PLL loop circuit that can keep a precise time between updates of the GPS or NTP references.
High precision local quartz oscillators and PLL circuits are not so expensive today.
I agree that having sync at a tower is most important even if we don’t have remote sync. We can deal with that. We just need a solution.