iansltx
join:2007-02-19
Golden, CO
kudos:2 Reviews:
 ·Comcast
| MTik nv2..."let's try this again" »download.mikrotik.com/newsletter27.pdf
Looks like everyone's going TDMA. They're saying single-chain performance can hit roughly wire-speed 100M Ethernet.
Anyone tried this stuff yet? |
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1 edit | This looks great, a router board with the 5ghz interface that can do 100mbps in TDMA mode for only 49$.
What pisses me of is why don't they offer them in All-in-one (UBNT like) CPE for a slightly higher price. I think they lost a big share of market just for that small detail. |
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iansltx
join:2007-02-19
Golden, CO
kudos:2 | Re: MTik nv2..."let's try this again" That's why I said "saying" rather than "I tested it and see this kind of throughput". Might be in a position to test some of this stuff on a nice clean link in a month or three, at which time I'll definitely post results. |
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| reply to iansltx
The only advantage of this compared to AirMAX is that nv2 works in non-802.11n chipsets too. (Regular R52,XR5 etc..) |
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| reply to iansltx
If they have the same failure rate on the Ethernet port during Lightning as the RB411's, then the integrated radio idea sucks - it's still more crap to through out every time there's a nearby strike. |
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 DaDawgsPremium
join:2010-08-02
Deltaville, VA | reply to spectrumhead
said by spectrumhead:The only advantage of this compared to AirMAX is that nv2 works in non-802.11n chipsets too. (Regular R52,XR5 etc..) Yeah, not much advantage there...  
I wonder if it will work on XR7 cards? |
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lutfulPremium
join:2005-06-16
Ottawa, ON Reviews:
 ·TekSavvy DSL
| said by DaDawgs:I wonder if it will work on XR7 cards? RF frequency conversion process is not visible to the low level Atheros driver, so there is no technical hurdle.
WISP firmware just needs to detect the card, enable 5Mhz setting at the 2.4Ghz channel number which converts to the center of your 700Mhz spectrum. |
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DaDawgsPremium
join:2010-08-02
Deltaville, VA | reply to Semaphore
said by Semaphore:If they have the same failure rate on the Ethernet port during Lightning as the RB411's, then the integrated radio idea sucks - it's still more crap to through out every time there's a nearby strike. Hence the threads on grounding... The last thing we loose on a pop which is damaged by lightening are the Mikrotiks.
We have one Mikrotik at every pop (30). Last thing to go every time. |
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lutfulPremium
join:2005-06-16
Ottawa, ON Reviews:
·TekSavvy DSL
| said by DaDawgs:said by Semaphore:failure rate on the Ethernet port during Lightning Hence the threads on grounding... I used to design Ethernet PHYs and have addressed this issue many times. PHY/PCB "ground" is actually isolated from RJ45 shield by the Ethernet transformers and Bellcore compliant PHY surge protector IC does not have any "ground" connection at all.
Semtech, Tyco, Bourne makes such part and provide ample help for PCB designers who wish to make their PCB LAN ports very robust against both ESD and lightning surge.
»www.semtech.com/images/mediacent···e-ag.pdf |
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| reply to DaDawgs
said by DaDawgs:said by Semaphore:If they have the same failure rate on the Ethernet port during Lightning as the RB411's, then the integrated radio idea sucks - it's still more crap to through out every time there's a nearby strike. Hence the threads on grounding... The last thing we loose on a pop which is damaged by lightening are the Mikrotiks. We have one Mikrotik at every pop (30). Last thing to go every time. Same here, i also have routerboards on every pop and i can't remember that i lost a port, i also have a lot of 411a's , never lost a port. I can't say the same for NanoSation I lost a lot of ports on the nearby strikes. |
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| reply to Semaphore
said by Semaphore:If they have the same failure rate on the Ethernet port during Lightning as the RB411's, then the integrated radio idea sucks - it's still more crap to through out every time there's a nearby strike. I have had very good luck with 411's (not grounded).
Only one I saw fail had direct hit (split antenna too)
Could you give us an idea of % of 411's.
I only have a few dozen: if you have a few hundred well the odds...
Are you having better or worse luck with Ubnt? |
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| I have about 500 MT's out there, and about 300 Canopy 900's. Roughly 300 of the MT's are RB450's, about half of those are in Roo's, the other half in ARC enclosures. The balance are older 133's and 112's mostly in Roo's. Everything is grounded to the Earth bond at the prem with a separate 20 ga grounding wire that runs right from the enclosure's grounding lug to the customer's Electrical Earth ground on the outside of the prem.
In the last round of Lightning storms - which lasted ~24 hours - I lost 14 RB450's, 1 Canopy 900SM (Direct hit), and 2 RB433's + 1 RB600 (Direct hit). However NO 133's, 112's, even a couple of Tranzeo's in service for 5 years keep on goin, didn't loose any other tower gear that wasn't hit directly. Over 1/2 the 450's that were killed were in ARC Enclosures. Some are on UTP, others on STP. No difference. The problem isn't the install; it's the design of the 450 Phy. |
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lutfulPremium
join:2005-06-16
Ottawa, ON Reviews:
·TekSavvy DSL
| said by Semaphore:The problem isn't the install; it's the design of the 450 Phy. IMHO any board sold for outdoor usage should add semtech/tyco/bourne PHY surge protection ICs right on the PCB.
Modern PHYs are using lower and lower voltage (going down to 2.5V for some gigabitPHY) and can actually be damaged by the small surge "let through" by most robust external surge protector. Older design PHY chips are more robust because they use higher voltage (5V or 3.3V). |
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| reply to iansltx
Sorry, didn't mean to derail the thread - my original point was that the all-in-one idea is to expensive unless the Ethernet port can be made more robust.... at least now I can salvage the Radio card.... so I won't be trying them any anytime soon. |
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| said by Semaphore:If they have the same failure rate on the Ethernet port during Lightning as the RB411's said by Semaphore:- I lost 14 RB450's, 1 Canopy 900SM (Direct hit), and 2 RB433's + 1 RB600 (Direct hit). However NO 133's, 112's,
RB450 is 5 port router with no mPci interface. Dont worry, even if they do all-in-one solution they wont include that board on the package. |
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jcremin
join:2009-12-22
Siren, WI
kudos:2 | said by ponline:RB450 is 5 port router with no mPci interface. Yeah, that's what I was thinking too... Not much purpose for a 450 in an antenna enclosure... Maybe 411?? That would make more sense to me as it would be one notch newer than the 133c boards that he also mentions. |
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| reply to ponline
Yeah - my mistake I was working on a 450 when I typed it - substitute 411 as required |
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lutfulPremium
join:2005-06-16
Ottawa, ON Reviews:
·TekSavvy DSL
1 edit | reply to iansltx
said by iansltx:Looks like everyone's going TDMA. Because of accurate hardware timers inside modern Atheros chipset. Allows vast improvement over software based "polling" methods which actually starting 8 years ago with names like Frottle and Karlnet.
said by iansltx:They're saying single-chain performance can hit roughly wire-speed 100M Ethernet. Uldis of Mikrotik wrote that "When testing N link with Nv2 you can get approx 97Mbps UDP traffic and 94Mbs TCP traffic through RB711 in one direction using one chain."
That is ~20mbps better than the 75mbps (300mbps/4) non-MIMO/non-TDMA throughput from 802.11a cards in similar lab testing done by him back in 2006. »300Mb/s PtP demo at Mikrotik 2006
BTW those are "controlled" performance tests - typical WISP deployments will see much less throughput.
said by iansltx:Anyone tried this stuff yet? You meant "nv2" with 802.11n cards? Some useful real-world numbers and issues are being reported in their forum. »forum.mikrotik.com/viewtopic.php?f=1&t=43612
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iansltx
join:2007-02-19
Golden, CO
kudos:2 | thx for the link. Reading now. |
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