PTMP Bad Throughput

RouterOS Wireless Networking
1

I’ve a Metal with 38 clients connected NV2 with RouterOS 6.22 (Wireless-fp enabled)
All clients are RouterOS>= 6.15 with Wireless-fp
I upgrade a client to (Groove 5Hn) RouterOS 6.22 without success

When I start a BWTest UDP I see 20-22Mbps but REAL TCP (speedtest or TCP BWTest 4 sessions) see 6-7Mbps

I’ve tried the best frequency on the AP, also tried TDMA=auto and TDMA=2ms
The rate of the station is 65Mbps-20MHz/1S and CCQ is 90%, signal -57/-58 dBm
Current bandwidth on the AP is 4-5Mbps

Why I’ve this bad real throughput

2

Test UDP
udp_test.png
Test TCP between two CCR
tcp_test.png
Signal
statusWireless.png

3

set tdma to 2 or 3
reduce TX power until the client get´s rx -68-70 per chain
may be your channel is not interference free.
You should get 38-42 mbit/s

4

96% CCQ and bad TCP Throughput… why ?

I can’t reduce tx-power because:
1 - longest client has no benefit
2 - with a -70 connection is very bad

But I ask why I see HIGH CCQ and bad performance.
Something wrong in the CCQ ??

5

If you enable the regular wireless package on the AP do you still see the low throughput?

6

Here is a screenshot from some of our installations testing 6.23
TDMA 3 Wireless FP
With 6.23 RX/TX was 1db better as in 6.19 maybe TCP throughput is a bit worse. But ping is o.k.
B-test TCP 1 stream to a client 5 km away (CCR → AP-RB912 -.-.-.-.- STA-RB911 → CCR)
normal traffic arround 20MBit/s + B-test 64 Mbit/s
the Sektor shows nearly 87 Mbits/s
UDP is between 120-140 MBit/s
test-6-23.JPG

7

I enable the REGULAR WIRELESS package, but after a restart wireless interface disappear (also after others reboot)

I had to enable the wireless-fp package and restart
normalWirelessPackage.png

8

You have only four stations

See my situation
The selected is one of the best clients that do the test
CCQwhileTesting.png
This a test with tdm 2ms
fp-tdma-2.png
This with tdma 3ms
fp-tdma-3.png

9

This with tdma auto
fp-tdma-auto.png

10

Now see the test on the D2:F1 station alone on the same AP (I only disconnected all other stations)
onlyOneTestStation.png
With all the other stations (even if the total traffic is less than 2megabit) it seems that the thoughput collapse.
Uldis I need a solution to this behaviuor

11

I tried again but before restarting I disabled the wireless-fp, enabled wireless (regular) and set the TDMA = 2

But thoughput (Always on same station) is worse with no other traffic (about 300Kbps in that moment)
regularWirelessOnAP.png

12

sonny hello settings show it you have the same problem in the slave 40 clients connected

13

@lupin
there are things you have to consider.
never connect more than 30 stations
do not mix N- an A-clients
show my a spectralhistory from AP and client - may be your frequency is not free

Here is a AP RB433AH with 29 clients up to 2km. All N 20Mhz TDMA auto
Backbone1 is 8km ptmP (8STA) then 1km ptp SXT all NV2 TDMA 3
throughput generated from clients. 42 MBit/s
AP433AH.JPG

14

@lupin
try to fix datarate at ht4 or ht5
even try to use TDMA 5-8 in 10MHZ channel or auto
then do a test

15

Hi sonny, I set all stations and ap with band=5ghz-onlyn
on ap I set tdma-period-size=3
and lower HT (see screenshot)

But result is same 9-10Mbps TCP send to the station
onlyN_onlyLowHT.png
10Mhz is not a solution because I need to deliver to all customers greater bandwidth possible

16

Hi Lupin,
have you done a spectral scan at AP side?
What throughput have you masured to the nearest station?

17

As I saw TCP throughput becomes better with MCS5
go to MCS4 or even MCS3.
If it becomes bettter, you have big interference at your used frequency.