airFiber X introducing $399

[David2006]

včetně možnosti dokoupit konvertoru na stávající antény? WTF?

Dyť jsem to tu psal, stačí číst .

[David2006]

Minoritní, ale i tak zajímavost:

In regards to the AF5X talking to the AF5 -

The flexibilty of the AirFiber line allows for alot of options to be considered and are programmable. A huge benefit of a custom radio design. If we were to do something along those lines it would involve some software work to make that happen.UBNT-Alex

[GRFS]

Rekl bych, ze jde o jiz objeveny objev. Prijimat a vysilat na jine frekvenci umi svym zpusobem vsechny Nano... veci. Staci si zapnout na APcku AirSelect a nastavit Hop Interval a Anounce Count. Pri vedomi toho, jak amici zvladaji marketing jsem toho nazoru, ze to klidne muze byt ta sama, jen pro potreby zvyseni prodejnosti jinak nazyvana ficura.

Jinak GPS neni potrebna, pokud se najde jiny Master, ktery ridi burst timing ostatnich radii na sajtu. To nemusi byt presne hodiny, dulezita je stejna faze na vsech AP, aby vsechny dokazaly synchroone rict svemu TX vcil muzes vyprasit svuj buffer do luftu. Je to zalezitost stara minimalne 20let a da se to demonstrovat treba na 2,4GHz technologii z 90 let min. stoleti. Nekde se mi to tu jeste vali.

[okoun]

hmm aha takže tento produkt je převlečený rocket krám, pokud by to bylo FDD tak jo ale takto je to jen marketingový shit jak píše GRFS

[David2006]

hmm aha takže tento produkt je převlečený rocket krám, pokud by to bylo FDD tak jo ale takto je to jen marketingový shit jak píše GRFS

Přesně jako vždy Okoune, nebrat .

[okoun]

ano pochopil si velmi dobře - nebrat

[David2006]

ano pochopil si velmi dobře - nebrat

No já to chápu, ono Ti z toho při Tvém postoji ani nic jiného vyjít nemohlo . Nějaké linky si tím v tomto roce asi nahradím/upgraduju rocketdishe .

[goblajz]

https://www.youtube.com/watch?v=0SJGe1k-RgI

[Jenya]

Rekl bych, ze jde o jiz objeveny objev. Prijimat a vysilat na jine frekvenci umi svym zpusobem vsechny Nano... veci. Staci si zapnout na APcku AirSelect a nastavit Hop Interval a Anounce Count. Pri vedomi toho, jak amici zvladaji marketing jsem toho nazoru, ze to klidne muze byt ta sama, jen pro potreby zvyseni prodejnosti jinak nazyvana ficura.

Jinak GPS neni potrebna, pokud se najde jiny Master, ktery ridi burst timing ostatnich radii na sajtu. To nemusi byt presne hodiny, dulezita je stejna faze na vsech AP, aby vsechny dokazaly synchroone rict svemu TX vcil muzes vyprasit svuj buffer do luftu. Je to zalezitost stara minimalne 20let a da se to demonstrovat treba na 2,4GHz technologii z 90 let min. stoleti. Nekde se mi to tu jeste vali.

Zbyva jen dodat, ze svym zpusobem na skoro vsech Nano vecech jde odletet na Mars.

[David2006]

Kdo chce může si počíst:

Guys,
If you want a little bit of insight on what we did for our TDD/HDD protocol (at least one early limited instantiation of it), you could peruse the following light reading:

https://www.google.com/patents/US201300 ... CC0Q6AEwAg

To answer the question posed about GPS sync and latency, I can tell you there is zero impact to latency with the AF/AFX implementation.
This is a real-time hardware based implementation and has been pointed out is far more robust than anything possible with WiFi based systems. WiFi based PTP/PMP systems are generally limited to interrupt driven sync implementations so timing accuracy and timing resolution is very constrained. In pretty much all WiFi based systems, the designer is limited to trying to "fool" the chipset to support a pseudo-frame, which results in serious performance impacts, problems with ACK timing and a bunch of other stuff. WiFi chips are fantastic in their intended environment (indoor, high amounts of multipath to ensure path orthogonality, high loss exponents) but they have serious underlying limitations for transporting large amounts of data with low overhead and low latency at long range while trying to elegantly coexist at the same time.
Gary

[rado3105]

Otázka je,:
1. či to vysiela stále (teda zaberá celu sirku aj ked tam neprebieha komunikacia) ako to je pri ostatnych airfiberoch?
2. je to FPGA?
3. vyzera to na vlastne cipy ubiquity?
4. GPS bude mozny len medzi af5x alebo aj v spolupraci s titanium?

mimo temu: niekto tu pisal o Nstreme dual - trosku prirovnanie mimo misu, kedze tam N nefunguj a na acku je mozne dosiahnut max. 60/60Mbit/s pri 20/20MHz kanaloch (cize 40 dokopy), nehovoriac o tom ze nie je vidiet ziadne ukazovatele ze spoj ma zle parametre....
ten airselect aj niekomu funguje?:)

este tam je zaujimava zmienka v datasheete: The first airFiber X model is the AF‑5X model for use in the 5 GHz frequency band.
z toho dedukujem ze planuju aj pre ine frekvencie co by bolo super a kazdy si kupi antenu aka mu sedi...

- teraz pozeram, ze to je robene len na slant anteny od ubiquity a na klasicke rockedishe az pouzitim prerabky....co tipujem bude pekne mastne....
neviete ci by to slo pouzit aj na klasicke 5ghz smerove anteny (jirous...)?

[Jenya]

Tak jsem si v tom trochu pocet a zjistil jsem, ze jejich HDD znamena krutopresne nacasovane odesilani dat. Zatimco vysilac odesila data na klienta, data od klienta jsou uz ve vzduchu a "doleti" na vysilac presne, kdyz skonci s vysilanim a na klienta zase v momente, kdy on dovysilal. Zadny cekani na data, kazdy vi, kdy protistrana dovysila, tak ji uz s predstihem posila data, aby tam byla presne na cas. Timto se oproti klasickemu TDD systemu zvysuje efektivita, ktera roste se zvysujici se vzdalenosti. V tom dokumentu je popsana tato technologie i v PTMP verzi.

Jinak mi to nedalo a trochu jsem si s UBNtakama psal a dovedel jsem, ze anteny maji slant (45st) jelikoz nejsou tolik nachylne na slabnuti signalu kvuli odrazum a maji stejne vyzarovaci diagramy v obou rovinach.

U tohoto spoje si mohu zvolit, bud simplex (HDD) s pevnym pomerem UP&DOWN a nebo TDD, pricemz primaci a vysilaci frekvence jsou pochopitelne kazda jina a mohu si zvolit i rozdilnou sirku pasma.


airFiber 5X Uses Dual Polarized Slant 45 antennas, or you can upgrade a Rocket™link that uses a RocketDish™ RD‑5G30/RD‑5G34* antenna.

A dipole, which is set at a slant of +45° when viewed from the front, will appear to be vertically polarized when viewed from
the side and will then appear at a slant of -45° when viewed from the rear.

Slant 45° antennas are more robust than traditional horizontal and vertical cross polarized solutions. Horizontal and vertical as cross polarizations can suffer fading due to reflections from buildings, vehicles and the general environment, these reflections
occur more easily than ±45°.

The radiation pattern from both ports of a ±45° Linear Polarization antenna are symmetrical and almost overlap whereas horizontal and linear polarized patterns differ substantially. Slant 45 degree antenna delivers more reliable coverage areas with less drop-outs.

Channel width flexibility allows you to independently configure TX and RX channel frequencies and place them anywhere within the radio band to avoid local interference.


You have two choices with AF 5X:

1) HDD - TX and RX on same frequency,

2) Frequency Duplex Division, TX and RX on different frequencies, sending data independently on each other

Thanks!

Shaibaz Khan
Ubiquiti Networks

Kdo chce může si počíst:

Guys,
If you want a little bit of insight on what we did for our TDD/HDD protocol (at least one early limited instantiation of it), you could peruse the following light reading:

https://www.google.com/patents/US201300 ... CC0Q6AEwAg

To answer the question posed about GPS sync and latency, I can tell you there is zero impact to latency with the AF/AFX implementation.
This is a real-time hardware based implementation and has been pointed out is far more robust than anything possible with WiFi based systems. WiFi based PTP/PMP systems are generally limited to interrupt driven sync implementations so timing accuracy and timing resolution is very constrained. In pretty much all WiFi based systems, the designer is limited to trying to "fool" the chipset to support a pseudo-frame, which results in serious performance impacts, problems with ACK timing and a bunch of other stuff. WiFi chips are fantastic in their intended environment (indoor, high amounts of multipath to ensure path orthogonality, high loss exponents) but they have serious underlying limitations for transporting large amounts of data with low overhead and low latency at long range while trying to elegantly coexist at the same time.
Gary

[GRFS]

jejich HDD znamena krutopresne nacasovane odesilani dat. Zatimco vysilac odesila data na klienta, data od klienta jsou uz ve vzduchu a "doleti" na vysilac presne, kdyz skonci s vysilanim a na klienta zase v momente, kdy on dovysilal. Zadny cekani na data, kazdy vi, kdy protistrana dovysila, tak ji uz s predstihem posila data, aby tam byla presne na cas a naopak.

Jo tak hlavne at to vysvetli tem vlnam, jak se maji sirit a jak odrazet, aby to bylo v souladu s presnymi GPS hodinami v kazdem tom radiu

[Jenya]

jejich HDD znamena krutopresne nacasovane odesilani dat. Zatimco vysilac odesila data na klienta, data od klienta jsou uz ve vzduchu a "doleti" na vysilac presne, kdyz skonci s vysilanim a na klienta zase v momente, kdy on dovysilal. Zadny cekani na data, kazdy vi, kdy protistrana dovysila, tak ji uz s predstihem posila data, aby tam byla presne na cas a naopak.

Jo tak hlavne at to vysvetli tem vlnam, jak se maji sirit a jak odrazet, aby to bylo v souladu s presnymi GPS hodinami v kazdem tom radiu

Proto tam preci soupli ten slant, ne?
Podle toho co jsem o tom do ted zjistil, GPS tam je kvuli synchronizaci s ostatnimi vysilaci na sajtu.

[Insider]

jejich HDD znamena krutopresne nacasovane odesilani dat. Zatimco vysilac odesila data na klienta, data od klienta jsou uz ve vzduchu a "doleti" na vysilac presne, kdyz skonci s vysilanim a na klienta zase v momente, kdy on dovysilal. Zadny cekani na data, kazdy vi, kdy protistrana dovysila, tak ji uz s predstihem posila data, aby tam byla presne na cas a naopak.

Jo tak hlavne at to vysvetli tem vlnam, jak se maji sirit a jak odrazet, aby to bylo v souladu s presnymi GPS hodinami v kazdem tom radiu

Proto tam preci soupli ten slant, ne?
Podle toho co jsem o tom do ted zjistil, GPS tam je kvuli synchronizaci s ostatnimi vysilaci na sajtu.

Kdyby jenom