52km NetMetal-AC Link

RouterOS Wireless Networking
1

We try to create a 52km link with NetMetal (RouterOS: 6.21.1)

Setting
channel width 20/40Ce
protocol: nv2 (with security)
Wireless Mode: onlyAC

We using a dual pol 34dB antennas
Signal is -51/-51

But link can’t be established

Log says:
15:50:05 wireless,info 4C:5E:0C:7C:XX:XX@wlan1: failed to connect, on 5460000, medium-access timeout
15:50:21 wireless,info 4C:5E:0C:7C:XX:XX@wlan1: failed to connect, on 5460000, ranging timeout


Seems to be a distance problem, but also setting the NV2-distance to 80km nothing change

2

Hello,
Hard to comment without seeing configs, but 70% probability, that you did config mistake.

Post /export verbose here without sensivity information

3

ACCESS POINT

/interface bridge
add name=br-diff
/interface wireless
set [ find default-name=wlan1 ] antenna-gain=34 band=5ghz-onlyac channel-width=20/40mhz-Ce country=italy default-authentication=no disabled=no frequency=5460 frequency-mode=superchannel l2mtu=\
    1600 mode=ap-bridge nv2-cell-radius=80 nv2-security=enabled rx-chains=0,1 ssid=XXX tdma-period-size=auto tx-chains=0,1 \
    wireless-protocol=nv2
/interface bridge port
add bridge=br-diff interface=ether1
add bridge=br-diff interface=wlan1
/interface wireless access-list
add interface=wlan1 mac-address=4C:5E:0C:6F:XX:XX
/ip address
add address=x.x.1.130/30 interface=br-diff 
/ip route
add distance=1 gateway=x.x.1.129
/system routerboard settings
set cpu-frequency=720MHz

STATION

/interface bridge
add name=br-diff
/interface wireless
set [ find default-name=wlan1 ] antenna-gain=34 band=5ghz-onlyac channel-width=20/40mhz-Ce country=italy default-authentication=no disabled=no frequency-mode=superchannel l2mtu=1600 mode=\
    station-bridge nv2-security=enabled rx-chains=0,1 scan-list=5180,5460,5500,5600,5700 ssid=XXX tx-chains=0,1 wireless-protocol=\
    nv2-nstreme-802.11
/interface bridge port
add bridge=br-diff interface=ether1
add bridge=br-diff interface=wlan1
/interface wireless connect-list
add interface=wlan1 mac-address=4C:5E:0C:7C:YY:YY
/ip address
add address=x.x.0.130/30 interface=br-diff
/ip route
add distance=1 gateway=x.x.0.129
/system routerboard settings
set cpu-frequency=720MHz
4

Sure its config mistake, but your conf looks ok, i have a 60km link with the net metal 5 ac, and i love it, btw im using Jirous Antenna Ubiquiti antennas also work ok but no the same as Jirous


cant post img forum changes

5

Some details of your configuration?
You use NV2?
tdma period size
cell radius?
channel width?
Only AC?

6

Lupin.
I am not sure if ac works with this set of wireless config:

band=5ghz-onlyac channel-width=20/40mhz-Ce

if you will change it to

band=5ghz-a/n/ac channel-width=20/40/80mhz-Ceee

what happens?
Station connects to ap?
what records appears in logs when station connecting to ap?

And what reason is to use

default-authentication=no

???

7

post the logs from the AP and the Station.
Make sure that you have specified the correct nv2-preshared-key on both ends.
Try setting the tdma-period size to a static one, for example 2.

8

Setting tdma to 2ms as suggested, link go up
So, BWtest show me bad results.

Frequency 5460, 40Mhz, Ce
rx_40Mhz_tdma2.jpg
tx_40Mhz_tdma2.jpg

9

Changing to
Frequency 5480, 40Mhz, Ce
rx_40Mhz_tdma2.jpg
tx_40Mhz_tdma2.jpg

10

Could you try attaching images now? I am curious to see your config as well.

11

Found the best frequency
TDMA Period Size:2ms
Channel Width: 20/40Mhz Ce (with 80MHz is worse)
Wireless Protocol: NV2 (with security)
RouterOS: 6.21.1

Results UDP
download.jpg
upload.jpg
Ping
ping.jpg

12

150mbit/s over 52km is nice. Can you tell us more about your setup.

  • How does the are look like?
  • Meters over ground?
  • Output power?
13

Sorry, this is the main link 43 km on old software




another link to complete de full link

after upgrade main link but nv1 very stable 200 mbps 1- 2 ms




config nv1 ap

/interface wireless
set [ find default-name=wlan1 ] ampdu-priorities="" band=5ghz-onlyac \
    basic-rates-a/g="" bridge-mode=disabled channel-width=20/40mhz-Ce \
    disabled=no disconnect-timeout=1s frequency=5420 frequency-mode=\
    superchannel l2mtu=1600 max-station-count=2 mode=bridge name=Wireless \
    nv2-cell-radius=48 radio-name="N2SLink SD-PA" rate-set=configured \
    rx-chains=0,1 scan-list=5420 security-profile=Security ssid=\
    "N2SLink SD-PA" supported-rates-a/g="" tdma-period-size=3 tx-chains=0,1 \
    vht-supported-mcs=mcs0-7,mcs0-7 wds-default-bridge=Bridge wds-mode=\
    dynamic wireless-protocol=nstreme
/interface wireless nstreme
set Wireless enable-nstreme=yes framer-limit=3998 framer-policy=best-fit

confi nv1 st

/interface wireless
set [ find default-name=wlan1 ] ampdu-priorities="" band=5ghz-a/n/ac \
    basic-rates-a/g="" channel-width=20/40mhz-Ce disabled=no \
    disconnect-timeout=1s frequency=5420 frequency-mode=superchannel l2mtu=\
    1600 mode=station-wds name=Wireless radio-name="N2SLink PA-SD" rate-set=\
    configured rx-chains=0,1 scan-list=5420 security-profile=Security ssid=\
    "N2SLink SD-PA" supported-rates-a/g="" tx-chains=0,1 vht-supported-mcs=\
    mcs0-7,mcs0-7 wireless-protocol=nstreme
/interface wireless nstreme
set Wireless enable-nstreme=yes

on nv2 de only diference is that i use tdma period size static on 3ms for more than 30km on less 2ms and at least 5 km more on cell radius.
60km.png
Real 2.png
Real 1.png

14

Great. Which antenna do you use - Mikrotik, Ubnt, Jirous?