Bridge disconnection and performance issue

LifeGame · Sat Jan 13, 2024 3:52 pm

Hi;
I built bridges using microtics for the camera project.

Modem : RBD53GR-5HacD2HnD
Switch: CRS326-24G2S+
ap bridge : RBOmniTikPG-5HacD
station bridge : RBOmniTikPG-5HacD

The microtics are powered by a 48v 2.5a adapter.
Cameras work with POE on microtics.

My Problems;
The system becomes very slow after a while after starting up. some station bridges keep disconnecting and reconnecting. I even have problems connecting to connected microtics with winbox.
Camera videos appear on the screen 5-10 seconds after movement.

Do you have any suggestions what I'm doing wrong?

Note:
I am building such a system for the first time. Therefore all devices are in the same office in a test environment.

Switch Conf

/interface bridge
add admin-mac=48:A9:8A:09:D8:63 auto-mac=no name=bridge port-cost-mode=short
/interface list
add name=WAN
add name=LAN
/interface lte apn
set [ find default=yes ] ip-type=ipv4 use-network-apn=no
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
/port
set 0 name=serial0
/interface bridge port
add bridge=bridge comment=defconf ingress-filtering=no interface=ether1 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether2 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether3 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether4 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether5 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether6 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether7 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether8 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether9 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether10 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether11 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether12 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether13 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether14 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether15 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether16 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether17 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether18 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether19 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether20 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether21 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether22 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether23 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=ether24 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=sfp-sfpplus1 \
    internal-path-cost=10 path-cost=10
add bridge=bridge comment=defconf ingress-filtering=no interface=sfp-sfpplus2 \
    internal-path-cost=10 path-cost=10
/ip settings
set max-neighbor-entries=8192
/ipv6 settings
set disable-ipv6=yes
/interface list member
add interface=ether1 list=WAN
add interface=ether2 list=LAN
add interface=ether3 list=LAN
add interface=ether4 list=LAN
add interface=ether5 list=LAN
add interface=ether6 list=LAN
add interface=ether7 list=LAN
add interface=ether8 list=LAN
add interface=ether9 list=LAN
add interface=ether10 list=LAN
add interface=ether11 list=LAN
add interface=ether12 list=LAN
add interface=ether13 list=LAN
add interface=ether14 list=LAN
add interface=ether15 list=LAN
add interface=ether16 list=LAN
add interface=ether17 list=LAN
add interface=ether18 list=LAN
add interface=ether19 list=LAN
add interface=ether20 list=LAN
add interface=ether21 list=LAN
add interface=ether22 list=LAN
add interface=ether23 list=LAN
add interface=ether24 list=LAN
add interface=sfp-sfpplus1 list=LAN
add interface=sfp-sfpplus2 list=LAN
/interface ovpn-server server
set auth=sha1,md5
/ip address
add address=192.168.70.3/24 interface=bridge network=192.168.70.0
/ip dns
set servers=8.8.8.8
/ip service
set telnet disabled=yes
set ftp disabled=yes
set ssh disabled=yes
set api disabled=yes
set api-ssl disabled=yes
/routing bfd configuration
add disabled=no interfaces=all min-rx=200ms min-tx=200ms multiplier=5
/system clock
set time-zone-name=Europe/Istanbul
/system identity
set name=70.3
/system note
set show-at-login=no
/system routerboard settings
set boot-os=router-os

ap bridge conf

/interface bridge
add name=bridge
/interface wireless
set [ find default-name=wlan1 ] band=5ghz-onlyac channel-width=\
    20/40/80mhz-XXXX country="united states3" disabled=no frequency=5745 \
    mode=ap-bridge nv2-security=enabled radio-name=70.4 ssid=onur \
    tdma-period-size=3 wireless-protocol=nv2 wps-mode=disabled
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
/ip hotspot profile
set [ find default=yes ] html-directory=hotspot
/interface bridge port
add bridge=bridge interface=ether1
add bridge=bridge interface=ether2
add bridge=bridge interface=ether3
add bridge=bridge interface=ether4
add bridge=bridge interface=ether5
add bridge=bridge interface=wlan1
/ip address
add address=192.168.70.4/24 interface=bridge network=192.168.70.0
/ip dns
set servers=8.8.8.8
/ip route
add disabled=no dst-address=0.0.0.0/0 gateway=192.168.7.1 routing-table=main \
    suppress-hw-offload=no
/system identity
set name=70.4
/system logging
add topics=wireless,debug
/system note
set show-at-login=no

station bridge conf

/interface bridge
add name=bridge port-cost-mode=short
/interface ethernet
set [ find default-name=ether2 ] poe-lldp-enabled=yes poe-priority=4
set [ find default-name=ether3 ] poe-lldp-enabled=yes poe-priority=6
set [ find default-name=ether4 ] poe-lldp-enabled=yes poe-priority=8
set [ find default-name=ether5 ] poe-lldp-enabled=yes
/interface wireless
set [ find default-name=wlan1 ] band=5ghz-onlyac channel-width=\
    20/40/80mhz-XXXX country="united states3" disabled=no frequency=5745 \
    mode=station-bridge nv2-security=enabled radio-name=70.5 ssid=onur \
    wireless-protocol=nv2
/interface lte apn
set [ find default=yes ] ip-type=ipv4 use-network-apn=no
/interface wifi channel
add band=5ghz-ax disabled=no name=channel width=20/40/80/160mhz
/interface wifi security
add authentication-types=wpa2-psk disabled=no name=security
/interface wifi configuration
add channel=channel country=Turkey disabled=no mode=ap name=cfg1 security=\
    security ssid=onur
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
add authentication-types=wpa2-psk mode=dynamic-keys name=onurgroup \
    supplicant-identity=""
/ip hotspot profile
set [ find default=yes ] html-directory=hotspot
/interface bridge port
add bridge=bridge ingress-filtering=no interface=ether1 internal-path-cost=10 \
    path-cost=10
add bridge=bridge ingress-filtering=no interface=ether2 internal-path-cost=10 \
    path-cost=10
add bridge=bridge ingress-filtering=no interface=ether3 internal-path-cost=10 \
    path-cost=10
add bridge=bridge ingress-filtering=no interface=ether4 internal-path-cost=10 \
    path-cost=10
add bridge=bridge ingress-filtering=no interface=ether5 internal-path-cost=10 \
    path-cost=10
add bridge=bridge ingress-filtering=no interface=wlan1 internal-path-cost=10 \
    path-cost=10
/ip firewall connection tracking
set enabled=no loose-tcp-tracking=no
/ip neighbor discovery-settings
set discover-interface-list=!dynamic
/ip settings
set max-neighbor-entries=8192
/ipv6 settings
set disable-ipv6=yes max-neighbor-entries=8192
/interface ovpn-server server
set auth=sha1,md5
/ip address
add address=192.168.70.5/24 interface=bridge network=192.168.70.0
/ip dns
set servers=8.8.8.8
/ip firewall service-port
set ftp disabled=yes
set tftp disabled=yes
set h323 disabled=yes
set sip disabled=yes
set pptp disabled=yes
/ip route
add disabled=no distance=1 dst-address=0.0.0.0/0 gateway=192.168.70.1 \
    routing-table=main scope=30 suppress-hw-offload=no target-scope=10
/ip service
set telnet disabled=yes
set ftp disabled=yes
set ssh disabled=yes
set api disabled=yes
set api-ssl disabled=yes
/routing bfd configuration
add disabled=no interfaces=all min-rx=200ms min-tx=200ms multiplier=5
/system clock
set time-zone-name=Europe/Istanbul
/system identity
set name=70.5
/system logging
add topics=wireless,debug
/system note
set show-at-login=no

LifeGame · Thu Jan 18, 2024 6:33 pm

Hi again;

I think I need help with the wifi channels...

(i m using 2 ap bridge and 5 station bridge)
My configs for ap-bridges.

Bridge -1

[admin@70.4] > interface/wireless/print advanced detail
Flags: X - disabled; R - running 
 0  R name="wlan1" mtu=1500 l2mtu=1600 mac-address=78:9A:18:4E:CA:47 arp=enabled disable-running-check=no interface-type=Atheros AR9888 radio-name="70.4" 
      mode=ap-bridge ssid="CamNetwork" area="" frequency-mode=regulatory-domain country=no_country_set installation=outdoor antenna-gain=0 frequency=5745 
      band=5ghz-onlyac channel-width=20/40/80mhz-Ceee secondary-frequency="" scan-list=default wireless-protocol=nv2 rate-set=default 
      supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps basic-rates-a/g=6Mbps max-station-count=2007 distance=dynamic tx-power=17 
      tx-power-mode=all-rates-fixed vlan-mode=no-tag vlan-id=1 wds-mode=disabled wds-default-bridge=none wds-default-cost=100 wds-cost-range=50-150 
      wds-ignore-ssid=no update-stats-interval=disabled bridge-mode=enabled default-authentication=no default-forwarding=no default-ap-tx-limit=0 
      default-client-tx-limit=0 wmm-support=disabled hide-ssid=no security-profile=default wps-mode=disabled station-roaming=disabled disconnect-timeout=3s 
      on-fail-retry-time=100ms preamble-mode=both compression=no allow-sharedkey=no station-bridge-clone-mac=00:00:00:00:00:00 ampdu-priorities=0 
      ampdu-subframes=default guard-interval=any 
      ht-supported-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7,mcs-8,mcs-9,mcs-10,mcs-11,mcs-12,mcs-13,mcs-14,mcs-15,mcs-16,mcs-17,mcs-18,mcs-19,mcs-20,mcs-
                 21,mcs-22,mcs-23 
      ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7 vht-supported-mcs=mcs0-9,mcs0-9,mcs0-9 vht-basic-mcs=mcs0-7 tx-chains=0 rx-chains=0 
      amsdu-limit=8192 amsdu-threshold=8192 tdma-debug=0 tdma-test-mode=0 tdma-hw-test-mode="" tdma-override-rate=disabled tdma-override-size=0 tdma-period-size=3 
      nv2-queue-count=2 nv2-qos=default nv2-cell-radius=30 nv2-security=enabled nv2-preshared-key="Onur1981/*" nv2-mode=dynamic-downlink nv2-downlink-ratio=50 
      nv2-sync-secret="" hw-retries=7 frame-lifetime=0 adaptive-noise-immunity=none hw-fragmentation-threshold=disabled hw-protection-mode=none 
      hw-protection-threshold=0 frequency-offset=0 rate-selection=advanced multicast-helper=disabled multicast-buffering=disabled keepalive-frames=disabled 
      skip-dfs-channels=all pci-info="00:00.0"

Bridge -2

[admin@RouterOS] > interface/wireless/print advanced detail
Flags: X - disabled; R - running 
 0  R name="wlan1" mtu=1500 l2mtu=1600 mac-address=78:9A:18:4D:2B:19 arp=enabled disable-running-check=no interface-type=Atheros AR9888 
      radio-name="70.10" mode=ap-bridge ssid="CamNetwork1" area="" frequency-mode=superchannel country=no_country_set installation=outdoor 
      antenna-gain=0 frequency=ch52/54/58 band=5ghz-onlyac channel-width=20/40/80mhz-Ceee scan-list=default wireless-protocol=nv2 
      rate-set=default supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps basic-rates-a/g=6Mbps max-station-count=2007 
      distance=dynamic tx-power-mode=default vlan-mode=no-tag vlan-id=1 wds-mode=disabled wds-default-bridge=none wds-default-cost=100 
      wds-cost-range=50-150 wds-ignore-ssid=no update-stats-interval=disabled bridge-mode=enabled default-authentication=no 
      default-forwarding=no default-ap-tx-limit=0 default-client-tx-limit=0 wmm-support=disabled hide-ssid=no security-profile=default 
      wps-mode=disabled station-roaming=disabled disconnect-timeout=3s on-fail-retry-time=100ms preamble-mode=both compression=no 
      allow-sharedkey=no station-bridge-clone-mac=00:00:00:00:00:00 ampdu-priorities=0 ampdu-subframes=default guard-interval=any 
      ht-supported-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7,mcs-8,mcs-9,mcs-10,mcs-11,mcs-12,mcs-13,mcs-14,mcs-15,mcs-16,mcs-17,mcs-
                 18,mcs-19,mcs-20,mcs-21,mcs-22,mcs-23 
      ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7 vht-supported-mcs=mcs0-9,mcs0-9,mcs0-9 vht-basic-mcs=mcs0-7 tx-chains=0 
      rx-chains=0 amsdu-limit=8192 amsdu-threshold=8192 tdma-debug=0 tdma-test-mode=0 tdma-hw-test-mode="" tdma-override-rate=disabled 
      tdma-override-size=0 tdma-period-size=3 nv2-queue-count=2 nv2-qos=default nv2-cell-radius=30 nv2-security=enabled 
      nv2-preshared-key="Onur1981/*" nv2-mode=dynamic-downlink nv2-downlink-ratio=50 nv2-sync-secret="" hw-retries=7 frame-lifetime=0 
      adaptive-noise-immunity=none hw-fragmentation-threshold=disabled hw-protection-mode=none hw-protection-threshold=0 frequency-offset=0 
      rate-selection=advanced multicast-helper=disabled multicast-buffering=disabled keepalive-frames=disabled skip-dfs-channels=all 
      pci-info="00:00.0"

Do you have any advice on the frequency and settings I use?
I can't solve the problems of stuttering and lagging in camera videos...

jaclaz · Thu Jan 18, 2024 7:20 pm

I just want to understand where the issue might be.

You have 6 sets of 4 cameras each, 24 in total.

Each set is concentrated (wired) to an AP.

One of these sets, let's call it AP#0 is connected directly (wired) to the CRS326-24G2S+ switch.

The other 5 sets (AP#1-5) are connected through wireless with (up to) 200 m[1] distance to the same AP#0.

I presume that there is no issue with the set of four cameras directly connected to the AP#0, the lag is only for the 5 sets that are wireless, right?

Is the behaviour the same when you have only one of these wireless sets connected (let's say only AP#1 powered, the rest off)?

Or it is better and if you power on more AP's get worse?

If the latter it could be both that the AP#0 is saturated by the feeds or that there are reciprocal interferences created by more AP's connected at the same time.

[1] 200 m seem to me a lot of distance on omnidirectional devices, for this kind of bridges I have only seen very directional devices used.

bpwl · Thu Jan 18, 2024 7:48 pm

This uses nv2 from two AP's , and on the same frequency? Did I see this correctly?
nv2 is not a 802.11 protocol, where AP and client wait for transmissions until the channel is clear.
The nv2 AP will tell who of the clients can transmit at what time slot.
2 nv2 AP's should synchronize, not to assign the same timeslot, or they must be in separate wifi channels, or be very remote

Very interested how you did setup the nv2 synchronisation. I have to do it also one day (10 nv2 AP, so not enough separate channels)
On separate channels now, my 5 AP and 20 clients work perfectly in nv2.

LifeGame · Thu Jan 18, 2024 11:49 pm

New and working topology.. (image delay problem persists)

@jaclaz
Each cam connected to AP wired. Cameras work with microtik poe. There is almost no wireless signal in the area where the system works. I'm the only one here

As the number of connected clients increases, the lag problem also increases. but the problem with a single client is minimal.

@bpwl
After watching this video I decided to use nv2
youtube com/watch?v=ktbtEfQruLs

AP BRIDGE
ap bridge (70.4)
/interface wireless channels
add band=5ghz-onlyac width=20 list=5GHz/80MHz extension-channel=Ceee frequency=5500 name=ch100/102/106

ap bridge (70.10)
/interface wireless channels
add band=5ghz-onlyac width=20 list=5GHz/80MHz extension-channel=Ceee frequency=5260 name=ch52/54/58

Everything else is the same except of course SSID

STATION BRIDGE
70.5-6-7-8-9 They all have the frequency on auto. I'm so tired of changing them one by one while experimenting. All settings are the same except SSID.

Note:
But I noticed that when I was using 5745 with 20/40/80 Ceee before, the video latency was much higher. After switching to 5260 20/40/80 Ceee there is still video lag but much less than before.

bpwl · Fri Jan 19, 2024 12:58 am

OK Thx. Easier to read what frequencies you use.
So no NV2 sync needed.
Only surprised on the lower channels: 5260 etc are supposed to be indoor only, they have lower EIRP power allowed, and do not work on Omnitik if set to a country in Europe.
I use 40MHz wide channels as block 5500+5520 (CH100-107) and 5640+5660 (CH132-139) and 5540+5560 (CH108-115). 5620+5640 (CH124-131) is 10 min CAC for spare
Gives me 260Mbps net data speed each. Selection needed to avoid DFS radar detects for some units.

Receivers will follow the AP in frequency, and actually will automaticly switch between nv2 or 802.11 if both are set, when the AP is changed.

The Omnitik 5 AC is the only Mikrotik device that I finally did NOT deploy because it is omnidirectional.
Using sector devices SXT SA5 and with 4 SXTsq as receivers each, to avoid all kinds of interference.
Starting in 802.11 and switching back/forth with nv2. They are now all on nv2, as best performing setup.

The local owner added 5 SXT SA 5 , in an attempt to avoid any trees. But now I have a tuning challenge.
Lower channels are for hAP, wAP and cAP mounted with each SXTsq, for client device service.

Maybe for the video, you could use better QoS? 8 queue's. See https://www.yumpu.com/en/document/read/ ... m-mikrotik

jaclaz · Fri Jan 19, 2024 2:49 pm

I well may be wrong, but besides the "external" interference, if you have a "receiver" device on a bridge (the one(s) wired to the router) and two or three "transmitting" devices (the ones connected to the cameras), these latter devices will likely create interferences among themselves (because they are omnidirectional devices) unless they are very far apart.

bpwl · Fri Jan 19, 2024 4:47 pm

Yes interference, or lets say coexistence(wait) times, are part of any wifi ether environment for the same channel . Overlapping channels would cause destructive interference ( no wait, but transmission corruption) even worse than coexistence.

Nv2 does not check and wait for clear channel. This gives better performance than check and try, but possible destructive transmissions when non-nv2 transmitters or other set of nv2 around.

Directional antenna are much better for avoiding interference, but higher probability for the "hidden node problem". Problem mitigated by the nv2 AP, as transmission regulator for his nv2 group, who by definition sees all members of the group. No need that members see each other in nv2 case.

LifeGame · Sat Jan 20, 2024 5:23 pm

@bpwl
So you're saying that;
1- These devices are powerful devices. So lower the antenna gain;
interface/wireless/set wlan1 antenna-gain=8

2- Use the right channels. For NV2 to work correctly;
ap bridge 70.4

/interface wireless channels
add band=5ghz-onlyac extension-channel=Ceee frequency=5500 list=5ghz name=ch100 width=20

ap station 70.5

/interface wireless channels
add band=5ghz-onlyac extension-channel=eCee frequency=5520 list=5ghz name=ch104 width=20

ap station 70.6

/interface wireless channels
add band=5ghz-onlyac extension-channel=eeCe frequency=5540 list=5ghz name=ch108 width=20

ap station 70.7

/interface wireless channels
add band=5ghz-onlyac extension-channel=eeeC frequency=5560 list=5ghz name=ch112 width=20

--------------------------------
ap bridge 70.10

/interface wireless channels
add band=5ghz-onlyac extension-channel=Ceee frequency=5660 list=5ghz name=ch132 width=20

ap station 70.9

/interface wireless channels
add band=5ghz-onlyac extension-channel=eCee frequency=5680 list=5ghz name=ch136 width=20

ap station 70.8

/interface wireless channels
add band=5ghz-onlyac extension-channel=eeCe frequency=5700 list=5ghz name=ch140 width=20

Do I understand correctly?

3- And finally, never use a 360-degree device.
I chose this device because I don't want to use a switch. The system is far away from settlements so I thought it would be okay. B didn't think about the possibility of them affecting each other.

I made a table. I hope it's correct;

bpwl · Sat Jan 20, 2024 6:54 pm

Thx for reading and applying.
I'm not very clear, and the MT documentation by moments is very confusing

@bpwl
So you're saying that;
1- These devices are powerful devices. So lower the antenna gain;
interface/wireless/set wlan1 antenna-gain=8

No one can lower the physical antenna gain with just a parameter. The "Antenna Gain" parameter in RouterOS is the value used in the EIRP emission calculation and limit. The sum of TXPower of the radio + that "Antenna gain " parameter must be (is) equal or lower than the EIRP level allowed in your country. The higher the antenna gain power parameter is set, the more the TXpower will be reduced.

Avoiding interference with just reducing the TXpower further almost never works. The channel is busy whenever even the faintest signal is detected. See: viewtopic.php?t=203076#p1049405. For an Omnitik 5 I assume the ether is busy around it up to 250 meter, around any Omnitik 5 when transmitting. AP or station makes no difference.

2- Use the right channels. For NV2 to work correctly;

Only the AP defines the used frequency. The stations (eg mode= "station bridge") just follow the frequency set by the AP.
As far as I understand your setup, you have only 2 AP (mode= AP bridge"), all the rest is station.
So you need 2 channel selections that do not overlap, these are to be set in the AP's. There is normally enough room in "wifi band 5 outdoor" for 2 or more selections with 20/Ce (=40) MHz bandwidth.
The stations don't count in this, they will use the AP's frequency, and only transmit in the time-slots assigned by their nv2 AP.
For mode 802.11, AP and stations have to check if the channel is free, count some random time-ticks and then check again. They transmit if the channel after the time-ticks is free.
Mikrotik WLAN drivers with their very limited transmission blocks, wait for 60% of the time, to transmit 30% of the time, when at 80MHz, 866Mbps interface rate.
NV2 assigns timeslot without waiting, only leaving an empty time-slot to allow an extra station to sign in the nv2 group.

But 5660/Ceee and 5680/eCee and 5700/eeCe and 5720/eeeC use the same 80MHz chunk. (Frequency is that of the C channel, the e's around are also used).
Nicely documented in your table: the 80MHz A B C D are the same frequencies
So you have 3 yellow blocks for outdoor.
And avoid the one with the red lines if you can. (Called CAC 10 minutes, weather radar channels, Channel Availability Check - CAC takes a full 10 minutes, before the AP can be activated)
So this leaves 2 preferred blocks of 80MHz, or 4 blocks with 40MHz, the onces I use (in Europe, USA has better signal in the high blue block)
Mikrotik WLAN driver uses the 20MHz frequency of the C channel to specify the channel, not the 40,80,160 channel numbers or freq in grey in your table.

jaclaz · Sat Jan 20, 2024 8:22 pm

The good news are that you are evidently not the first one to get an Omnitik and find that it is too omnidirectional and gets too much noise.

In case of need, search for EAN 5901225202338, it corresponds to a custom made shield for the Omnitik 5, or however search for "anti-noise shield omnitik" (without quotes), example:

https://www.xpatit.gr/en/wireless-netwo ... etail.html

The idea is to convert it into a 120° sector.

LifeGame · Mon Jan 22, 2024 9:38 am

@bpwl
This information is very useful for me. I understand mikrotik better. Thanks for your patient answers...

@jaclaz
Good idea. I'll try it.

Bridge disconnection and performance issue [SOLVED]

Bridge disconnection and performance issue

Re: Bridge disconnection and performance issue

Re: Bridge disconnection and performance issue

Re: Bridge disconnection and performance issue

Re: Bridge disconnection and performance issue

Re: Bridge disconnection and performance issue

Re: Bridge disconnection and performance issue

Re: Bridge disconnection and performance issue

Re: Bridge disconnection and performance issue

Re: Bridge disconnection and performance issue [SOLVED]

Re: Bridge disconnection and performance issue

Re: Bridge disconnection and performance issue

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