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MUM Europe 2020
 
durim
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Wed Feb 21, 2007 3:20 pm

That should be fine depending how much traffic do you need I have done even longer shots with that .
 
durim
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Wed Feb 21, 2007 5:23 pm

That shuould be fine for 1MBps with a good connection you can have up to 10 MBps with nstream , I have reached up to 40 km link shot .
 
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acim
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Thu Feb 22, 2007 8:56 pm

I have 37Mbps full duplex at 21km distance turbo A nstreme, although with PC's running MT.
 
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acim
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Fri Feb 23, 2007 1:18 pm

No, I am using SR5 on both sides in this case.
 
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polokus
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Fri Feb 23, 2007 5:00 pm

I have 37Mbps full duplex at 21km distance turbo A nstreme, although with PC's running MT.
is it 74mbps agregate? or 37mbps agregate? how fast is the cpu?
if i'm using rb532a how fast is the link with dual nstreme enabled? how about the latency? is it possible to reduce to 30ish msec?
Please give an advice to reach this kind of speed.

-polo
 
dawam
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Fri Feb 23, 2007 6:51 pm

No, I am using SR5 on both sides in this case.
acim,

what the antenna gain? .. if you could share. its good to know what's possible with what hardware.

thx
 
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acim
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Fri Feb 23, 2007 9:22 pm

Both sides SR5 card and 32dB dish antenna made in Serbia. 80cm radius perforated.
 
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GWISA
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Sat Feb 24, 2007 12:13 pm

We easily get 40km on CM9 20dBm using 31dBi grids on both sides.

Link quality is 98%, signal strength -68, data rate 48Mbps, throughput 10Mbps one way due to RB processor limitations
 
matthias
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Sat Feb 24, 2007 6:58 pm

@gwisa:
so you are putting totaly about 50dbm on this link, right?

20dbm from the cm9 and 31dbi from the grids?!
nice, but not allowed for me ;-)

what do you reach if you put at total 30dbm on the link?
 
dawam
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Sat Feb 24, 2007 7:04 pm

Great Guys,

Maybe we have a sticky on what possible with what hardware.
At least we don't have to fill the forum asking the same questions.

Will post asking MT to do that..

ok here's the request.
http://forum.mikrotik.com/viewtopic.php?t=14117
 
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GWISA
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Sat Feb 24, 2007 9:20 pm

@gwisa:
20dbm from the cm9 and 31dbi from the grids?!
nice, but not allowed for me ;-)

what do you reach if you put at total 30dbm on the link?
You should be able to comfortably get 10-15km with a good LOS. We use 24dBi+20dBm (34dBm total output) up to 10km, 27dBi for 10km-25km, and 31dBi above that.

We have not yet had the need to use a higher-powered card, and have a few 45km links running very well. Ping times are as for any other link - around <5ms.
 
matthias
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Sat Feb 24, 2007 11:10 pm

hi,

why is 24dbi+20dbm -> 34dBm?
In my Opinion it should be 44 dBm - or not?!?!

i thought if i give a tx-power of 10dbm, than it adds 10dbi to my total tx-power...

Is this not right?
I would be happy if not so ;-)
 
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GWISA
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Sun Feb 25, 2007 2:39 am

oops... you're right... damn calculator must be broken ;)
 
matthias
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Sun Feb 25, 2007 10:56 am

alright :wink:

so you are using 44dbm for shots up to 10km - right?

Thats about 25 Watt - we are only allowed to do 1 Watt here....

Is it allowed in south africe to do such high power on the link or does nobody care about it?
 
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GWISA
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Mon Feb 26, 2007 3:58 pm

Are you sure you are limited to only 1W EIRP for ptp? That doesn't sound too practical to me... What country are you working in?

It is quite possible and more likely that the EIRP limits you are quoting are actually the transmitter output power allowed in a ptmp system.

For eg:
FCC guidelines (USA) states that you may have up to 200W EIRP on 5.8GHz ptp links...

2.4GHz ptmp broadcasting is limited to 4Watts EIRP by FCC

I know the UK is a bit more strict on their EIRP regulations...

I can't find anything to qoute here from the ZA regulator EIRP regulations - ICASA - their site currently has no info and mostly always has no practically usable info except the organisational structure which is basically blowing hot air. There is also not much point in phoning them, as they aren't too clued up on the phone either, and I do not feel like bothering more senior persons... ;)

When we approached our regulator for allowed emission levels on our licenced band, we were given 11 Watts for ptmp systems. We don't have a clear figure for ptp as yet...
 
babyface
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Mon Feb 26, 2007 4:52 pm

In Spain, for example, 1W is the maximun allowed for 5.8Ghz

PD: 100mW maximun for 2.4Ghz
 
matthias
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Mon Feb 26, 2007 5:01 pm

same for me in Germany -> ETSI regulation....
 
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rickard
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Tue Feb 27, 2007 11:19 am

And we in Sweden have 1 watt in 5,4-5,7 ghz but we can use 2 watt in 5,7-5,8 Ghz (Telemetric) and on 2,4 ghz 100mw :-(

//Rickard
 
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mcozio
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Fri Mar 02, 2007 4:27 pm

Poland
2,4 100mW
5,1-5,3 1W indoor
5,4-5,8 1W outdoor
no turbo allowed, but people are using
 
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tgrand
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Fri Mar 02, 2007 6:51 pm

If I am not mistaken the eirp for 2.4 (fcc regulation) is set at 4Watts EIRP with a limit of 1Watt Feeding into the antenna.

Could it be that this 1Watt limit is what is being refered too?
I beleive that for these people claiming such low limits should verify the max EIRP in their countries. They may find that are not limited as much as they thought.

I do not, however, know the limits in european countries.
I am only familiar with FCC(usa) and CRTC(canada).
 
cmit
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Fri Mar 02, 2007 10:40 pm

Well, tgrand, it's sad but true ;-)...

In ETSI regulated countries (Europe) there are such low limits.

Germany:
- 100 mW EIRP (yes, not fed INTO the antenna) for 2.4 GHz
- 1 W EIRP in the upper 5 GHz band (5.4-5.8 GHz), and you have to have DFS and TPC
(the lower 5 GHz band is just allowed for indoor usage in Germany)

Best regards,
Christian Meis
 
triac
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Sat Mar 03, 2007 5:05 pm

Germany:
- 100 mW EIRP (yes, not fed INTO the antenna) for 2.4 GHz
- 1 W EIRP in the upper 5 GHz band (5.4-5.8 GHz), and you have to have DFS and TPC
(the lower 5 GHz band is just allowed for indoor usage in Germany)


The same in Italy, but 1 Watt EIRP isn't too bad with right antennas... 18.5 Km with 10/12Mbit full duplex (MT bandwidth test) using 28dBi grid antennas and CM9 cards... same value with R52 cards. The signal crosses a lake (Bolsena lake, 14 Km of diameter).
Paolo Torri
 
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GWISA
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Sun Mar 04, 2007 12:40 am

Well the answer for such low emission regulations is to use dual-antenna links... big antenna on receiver, small antenna on transmitter...

You could have the same nett gain at the end of the day...
 
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kapulan
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Mon Mar 05, 2007 12:59 pm

My point to point link:
18km
2 80cm Grante parabolic system 31db
2 tonze 686x tx-power using:14db
2x 10m h-1000 coaxial cable
Signal strength -65db
58mbit half duplex
29mbit full duplex

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