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grlmutiajr
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OmniTik as a wireless hub - duty cycle issue

Mon Jun 27, 2022 1:31 am

Hi team,

Good day.

We've noticed some issues on one small site that was deployed years ago. We are currently using an omnitik as a wireless hub with an incoming and outgoing feed off it. Please see attached photo for the basic network diagram. We understand that the duty cycle can be a big factor in this problem as the omni can only transmit or receive at a time.

The question is, is there a configuration (without adding gear immediately) on the omni or sxts (stations) to optimise the network? With fibre installed on the site, it will stick out like a sore thumb.

Below is the config for the omni, thanks guys/gals!

# jun/27/2022 09:57:45 by RouterOS 6.46.2
# software id = FFB2-GQED
#
# model = OmniTIK UPA-5HnD
# serial number = 4C9B0435392F
/interface bridge
add admin-mac=E4:8D:8C:DC:3C:F8 auto-mac=no fast-forward=no name=bridge
/interface ethernet
set [ find default-name=ether1 ] advertise=10M-half,10M-full,100M-half,100M-full,1000M-half,1000M-full mac-address=E4:8D:8C:DC:3C:F8
set [ find default-name=ether2 ] advertise=10M-half,10M-full,100M-half,100M-full,1000M-half,1000M-full comment=RocketM2 mac-address=E4:8D:8C:DC:3C:F9
set [ find default-name=ether3 ] advertise=10M-half,10M-full,100M-half,100M-full,1000M-half,1000M-full comment=NanoM2 mac-address=E4:8D:8C:DC:3C:FA poe-out=forced-on
set [ find default-name=ether4 ] advertise=10M-half,10M-full,100M-half,100M-full,1000M-half,1000M-full mac-address=E4:8D:8C:DC:3C:FB poe-out=forced-on
set [ find default-name=ether5 ] advertise=10M-half,10M-full,100M-half,100M-full,1000M-half,1000M-full mac-address=E4:8D:8C:DC:3C:FC
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
add authentication-types=wpa2-psk eap-methods="" management-protection=allowed mode=dynamic-keys name=pass supplicant-identity=""
add authentication-types=wpa2-psk eap-methods="" management-protection=allowed mode=dynamic-keys name=passcam supplicant-identity=""
/interface wireless
set [ find default-name=wlan1 ] band=5ghz-onlyn channel-width=20/40mhz-Ce country="new zealand" disabled=no frequency=5600 frequency-mode=superchannel hide-ssid=yes ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3 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-16,mcs-17,mcs-18,mcs-19,mcs-20,mcs-21,mcs-22,mcs-23 mode=ap-bridge name=wlan2 nv2-security=enabled radio-name=omni-laundry security-profile=pass ssid=link-laundry \
    wireless-protocol=nv2
/interface wireless nstreme
set wlan2 enable-nstreme=yes
/ip ipsec proposal
set [ find default=yes ] enc-algorithms=aes-128-cbc
/snmp community
set [ find default=yes ] addresses=0.0.0.0/0
/interface bridge port
add bridge=bridge hw=no interface=ether1
add bridge=bridge hw=no interface=ether2
add bridge=bridge hw=no interface=ether3
add bridge=bridge hw=no interface=ether4
add bridge=bridge hw=no interface=ether5
add bridge=bridge interface=wlan2
/ip address
add address=10.5.50.230/24 interface=bridge network=10.5.50.0
/ip dns
set servers=8.8.8.8
/ip route
add distance=1 gateway=10.5.50.1
/ip ssh
set allow-none-crypto=yes forwarding-enabled=remote
/system clock
set time-zone-autodetect=no time-zone-name=Pacific/Auckland
/system identity
set name=omni-laundry
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Ca6ko
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Re: OmniTik as a wireless hub - duty cycle issue

Mon Jun 27, 2022 10:01 pm

Your scheme is not exact, that's why I don't understand the reason
Screenshot_11-1.jpg
PS Why do you limit the speed of ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3
If you have only one channel then you need to disable ht-supported-mcs mcs 8-15
And if you still have two then you need to change ht-basic-mcs to mcs 8-15 this will slightly increase the speed.
If the signal level is so weak that mcs 4-7 do not work then mcs 12-23 must also be disabled
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grlmutiajr
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Re: OmniTik as a wireless hub - duty cycle issue

Tue Jul 05, 2022 5:00 am

Hey, thanks for the reply.

Here's an updated network diagram, to help you understand. Having the omni in-between the sxt's is what I meant by a wireless hub. We've got a nano at the end of the network, facing the clients.

We are getting a 100Mbps if we are only doing a speed test from one leg of the network, example: gateway to the omni and omni to the remote powerbox. That 100Mbps drops to around 40Mbps if we do it end-to-end. CPU's not spiking to 100%, we believe it's just the link.
Screenshot_11-1.jpg (127.45 KiB) Viewed 20 times
PS Why do you limit the speed of ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3
If you have only one channel then you need to disable ht-supported-mcs mcs 8-15
And if you still have two then you need to change ht-basic-mcs to mcs 8-15 this will slightly increase the speed.
If the signal level is so weak that mcs 4-7 do not work then mcs 12-23 must also be disabled
Thanks for this insight by the way. At the moment, data rates are on default and we are picking mcs settings will become auto. The speed was initially limited for some odd reason, as I say, it's an existing site well before my time. So I would not know why.

I hope this follow-up helps. Thanks.
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mkx
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Re: OmniTik as a wireless hub - duty cycle issue

Tue Jul 05, 2022 8:25 am

Keep in mid that if Omni serves both SXTs with same radio, then each and every ethernet frame passing the wireless bridge uses air time twice. Add a bit of processing overhead/delay on omni and some performance degradation due to increased number of collisions and it's more than understandable that overall throughput drops to less than half of realistic maximum available from omnitik's radio.

Omnitik's radio is a a/n with theoretical maximum wireless rate of 300Mbps. Realistic payload throughput is mostly a bit less than half of theoretical maximum, so something a bit higher than 100Mbps (and that's what you're getting). Then add double air-time usage due to using omnitik as wireless hub and you get what you get.
 
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Ca6ko
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Re: OmniTik as a wireless hub - duty cycle issue

Tue Jul 05, 2022 10:41 am

At the moment, data rates are on default and we are picking mcs settings will become auto.
In the default installation you set ht-basic-mcs=mcs0-8. I advised you to set "...ht-basic-mcs to mcs 8-15 this will slightly increase the speed."
A radio engineer will always tune the unit manually better than an automatic tune.
You have a bad network design. Using OmniTIK as a repeater greatly reduces the overall throughput. I would recommend upgrading your network now. Install a separate radio bridge to the OmniTIK.
As a last resort, install a DISC Lite5 ac or SXTsq 5 ac first on the OmniTIK side only and eventually replace the SXT Station@Gateway
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grlmutiajr
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Re: OmniTik as a wireless hub - duty cycle issue

Wed Jul 06, 2022 2:33 am

Hi team,

Appreciate the responses, they greatly helped. I'm not an RF engineer, looking at this issue in a networking perspective thus creating this post. We are going to the solution posted above, having a dedicated uplink from the omni back to the gateway. Best of wishes everyone.

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