Hi,
I'm having a problem with a Netmetal and a PTP 8Km link.
The firmware is the 6.30.1 on both devices and they are attached to 2 mANT 30db.
Doing a speedtest.net with nstreme I get 60Mbps DOWN and 30Mbps UP with nv2 I get about 30Mbps DOWN and 20Mbps UP.
Why?
This is the signal:


There are other 4 sector on the same pole but they cannot be removed so for the interference I set the best modulation manually and the farthest frequency.


/interface bridge
add name=bridge1
/interface wireless
set [ find default-name=wlan1 ] adaptive-noise-immunity=ap-and-client-mode band=5ghz-onlyac basic-rates-a/g="" channel-width=20/40mhz-Ce country=italy default-authentication=no disabled=no distance=13 frequency=5475 frequency-mode=superchannel ht-basic-mcs=mcs-0,mcs-1 ht-supported-mcs=\
mcs-0,mcs-1,mcs-3,mcs-7,mcs-9,mcs-11,mcs-12,mcs-13,mcs-14 hw-retries=14 l2mtu=1600 max-station-count=1 mode=ap-bridge mtu=1600 nv2-cell-radius=12 nv2-preshared-key=xxxx nv2-security=enabled radio-name=AP rate-set=configured rx-chains=0,1 scan-list=\
5470-5720 ssid=AP supported-rates-a/g="" tdma-period-size=auto tx-chains=0,1 tx-power=1 tx-power-mode=all-rates-fixed vht-basic-mcs="" vht-supported-mcs="" wireless-protocol=nstreme
/interface ethernet
set [ find default-name=ether1 ] mtu=1600
set [ find default-name=sfp1 ] mtu=1600
/interface wireless nstreme
set wlan1 disable-csma=yes enable-nstreme=yes framer-limit=4000 framer-policy=best-fit
/接口无线安全性配置文件
set [ find default=yes ] authentication-types=wpa2-psk eap-methods="" mode=dynamic-keys supplicant-identity=MikroTik wpa2-pre-shared-key=xxxx
/interface bridge port
add bridge=bridge1 interface=ether1
add bridge=bridge1 interface=wlan1
add bridge=bridge1 interface=sfp1
/interface wireless access-list
add interface=wlan1 mac-address=4C:5E:xxxx vlan-mode=no-tag
/ip address
add address=10.10.10.2/24 interface=bridge1 network=10.10.10.0
/ip dns
set servers=8.8.8.8,8.8.4.4
/ip route
add distance=1 gateway=10.10.10.1
/system clock
set time-zone-autodetect=no

Your signal is too low for 8km, it should be ~-50. You turned down power to much.
Also I would set 20Mhz and see how it goes. Also on AC hardware setting manual rates is not a good idea.

The EIRP limit in my country is 1W so with a 30db antenna I can't increase the power.
Using the Mikrotik link calculator the signal is as theory predict...
With 20MHz the situation is worst.

Any solution?

Your Rx CCQ is bad. Can you change frequencies to find a better channel?

There are no other free frequency, do you thing that an rf armor can solve the problem?

Try more power and see if is any improvements. I don't think you will go to prison.

Hi!

You should upgrade your system to RouterOS version 6.30.3 as well make sure you are using latest firmware, upgrade it by CLI command :
Few wireless properties which you should change (using Nv2):

1. Distance to dynamic.
2. As one of user already recommended, user rate-set=default.
3. Increase cell radius to 30. Higher cell radius than needed will affect link much less then setting too low cell radius, as router can't calculate precise value ( because of interference etc. ) - better is to use higher value.
4. Change TDMA-period-size to static value. With high interference and non-static traffic it'll work for you much better. Try different values. Start with 2 then 3,4,5 etc.

You should upgrade your system to RouterOS version 6.30.3

Up to now 6.30.2 is the current version. From where we can download 6.30.3 version?

Hi!

You should upgrade your system to RouterOS version 6.30.3 as well make sure you are using latest firmware, upgrade it by CLI command :

Code:Select all

/system routerboard upgrade

Few wireless properties which you should change (using Nv2):

1. Distance to dynamic.
2. As one of user already recommended, user rate-set=default.
3. Increase cell radius to 30. Higher cell radius than needed will affect link much less then setting too low cell radius, as router can't calculate precise value ( because of interference etc. ) - better is to use higher value.
4. Change TDMA-period-size to static value. With high interference and non-static traffic it'll work for you much better. Try different values. Start with 2 then 3,4,5 etc.

I've just done it but Nstreme carries more bandwidth

You should upgrade your system to RouterOS version 6.30.3

Up to now 6.30.2 is the current version. From where we can download 6.30.3 version?

Sorry I meant 6.30.2 not 6.30.3

We have similar experiences, better throutput (140 Mbps of TCP) , but big difference between UDP vs TCP (300-400 Mbps on UDP and 140 Mbps on TCP).

But even this 140 Mbps are low because of marketing material that say 800 Mbps ??
As we are testing on different links (with and without interferences) this is maximum that we can got on NV2.

And BIG BIG problem on Netmetal (922 and 921) devices are unstable LAN port, which suddenly stop working even all parameters are UP and running, but only solution is to reboot device one or more times.
We are waiting Mikrotik to solve this BIG problem for Months

No problem for me with lan but with led's plastic stickers, it comes of.

And BIG BIG problem on Netmetal (922 and 921) devices are unstable LAN port, which suddenly stop working even all parameters are UP and running, but only solution is to reboot device one or more times.
We are waiting Mikrotik to solve this BIG problem for Months

I confirm this BIG PROBLEM !!!
seem that all Routerboard with ac-chipset are affected
In my network (sxt-ac, RB922, NetMetal, NetBox)

After some times traffic freeze and only a reboot, restore the situation or, as draguzet say, more reboot

Mikrotik team please fix
Is simple to reproduce: take a NetMetal connect to a RB1100 and try to mac-ping.
Now try to reboot the netmetal many times. You can see the behaviour one of these reboot

As for the wireless TX-power I've wrote this topic in the Trainers closed area.

The WiFi regulations in Europe limits the 5Ghz EIRP to 30dB, at least most of Europe.
All the boards with built in a 5Ghz radio have the high TX-powered radios (-5HPnD).
When PtP links with high gain antennas are built with those boards we have to lower the TX-power so much that the radios comes out of it's calibration.
The complication with this is that it will lower the CCQ and overall performance of the radio.
So to get a stable and good working long distance PtP link in Europe, we need an other calibration or a low TX-powered radio in those PtP boards.
I had this conversation with Uldis at the MuM in Venice, and he admitted that when the power is reduced to under 6-7dB the radio comes out of it's calibration.

I've compared the built in radio in the RB912UAG-5HPnD-OUT with an added SR71E radio in the same board and the difference in stability and quality of signal is obvious.
I hope we can have both a EU and a US/global profile for the radio.

Regards,
Paul

Hi Dear,

Do not go for the latest version as we counter it has some issue.
Go for the V6.29.1 and besure you are using nv2.

This is our link bandwidth test for 16KM.

Test by new firmware..

Can you please tell us more about the configuration.
TX-power settings, show a status of registred clients, etc.

/Paul

Test by new firmware..

TCP or UDP traffic ?

Test by new firmware..

Can you please tell us more about the configuration.
TX-power settings, show a status of registred clients, etc.

/Paul

Hi,

Because we test higher quality shielded antenna for isolate interference & noise..
Very happy, good result, but the shielded antenna so expensive..
TX power not yet set down( using default ).. still in testing..

6357

In most of the Europe (ETSI) we are limited to 30dB EIRP (5470 to 5725 MHz) in 5GHz, it's interesting to have some data of your EIRP (RF power from the radio + antenna gain).
If the antenna have 30dB gain, you are limited to 0 dB power input, how does the radios behaves then?
In the upper frequency band (5725 – 5875 MHz) we are allowed up to 36dB EIRP, depending of country regulations.
This is a problem, read my earlier post.

In most of the Europe (ETSI) we are limited to 30dB EIRP (5470 to 5725 MHz) in 5GHz, it's interesting to have some data of your EIRP (RF power from the radio + antenna gain).
If the antenna have 30dB gain, you are limited to 0 dB power input, how does the radios behaves then?
In the upper frequency band (5725 – 5875 MHz) we are allowed up to 36dB EIRP, depending of country regulations.
This is a problem, read my earlier post.

Hi,

Antenna gain is 30dbi, tx power set to 9db. and channel 5800 Mhz.. ( LMR400 cable 5 meter )
signal strength around -53dBm. throughput (TCP) around 180 Mbps full duplex.. udp around 320 Mbps full duplex.
we still in testing...
finish result will be share it..[/quote]

Hey,

Thanks, for sharing this.
Are you in Europe? Do you have the same regulation, so you are limited to 36dB EIRP?
I looking forward to read your final results.
Remember, run BW-test between units connected to the radio, not the radios itself

/Paul