Bad latency on P2P-Link MikroTik SXT G-5HnD

RouterOS General
1

Dear MikroTik Users!

I am very new to the MikroTik Hardware.

I switched from UBNT NanoBridges M5 22dBi to MikroTik SXT G-5HnD and have some questions about latency.

Before i switched from UBNT to MikroTik, my ping was between 1.2ms and 2.5ms with AirMAX (TDMA) enabled.

To setup both MikroTik SXT G-5HnD i used this HowTo:
http://www.wispforum.net/entry.php?5-How-to-Connect-two-Mikrotik-SXT-5D-s-In-Bridge-Mode-Part-I

Everything is done as described in the HowTo. But now my ping is not that pretty as with UBNT-Hardware.

The ping now results in

19 packets transmitted, 19 received, 0% packet loss, time 17994ms
rtt min/avg/max/mdev = 2.164/6.991/8.401/1.508 ms

Are this round-trip-times normal or can i archive better times with other settings?

About the P2P-Link

  • Used MikroTik SXT G-5HnD
  • Firmware v5.15
  • Tx/Rx Signal Strength -58/-57 dBm
  • Tx/Rx Signal Strength Ch0 -61/-60 dBm
  • Tx/Rx Signal Strength Ch1 -62/-61 dBm
  • Signal To Noise 60 dB
  • Tx/Rx CCQ 100/66 %
  • Tx/Rx Rate 270.0Mbps/121.5Mbps

Cheers,
Michael.

2

CCQ is pretty bad at 66%. Maybe try a different channel. Also, give NV2 a try, it is Mikrotik’s TDMA.

http://wiki.mikrotik.com/wiki/Manual:Nv2

3

Yes. CCQ was bad but now it is at 98%.

NV2 was enabled all the time. Also NStream is enabled as seen in other howto.
I’ve spent lot of time to understand how MikroTik Hardware is working, and spent a lot of in HowTos also.

This is my configuration on the “Station Bridge” side:

SEE ALL PICTURES

Tested: UDP / TCP / UDP
UDP @ 200MBit
TCP @ 39 MBit
CCQ 98%

  • bridge1 ports: wlan1, ether1 [RSTP enabled]
  • 20/40 MHz Upper Auto-Bandwidth
  • Distance dynamic
  • HT Guard Interval: any
  • HT AMPDU Priorites: all
  • WDS: dynamic on bridge1
  • Wireless Protocol: nv2
  • Frequency: 5540 MHz
  • Tx/Rx Rate: 270MBit / 270 MBit
  • Tx/Rx Signal Strength: -57 / -58 dBm
  • Tx/Rx Signal Strength Ch0: -60 / -60 dBm
  • Tx/Rx Signal Strength Ch1: -61 / -61 dBm
  • Noise Floor: -117 dBm
  • SNR: 59dB
  • Tx/Rx CCQ: 95% / 99%
  • Distance: 2km

WDS can be disabled, right? The IP-Layer-2 (MAC-Address) remains untouched?

Can i achieve 1-2ms with MikroTik SXT G-5HnD?

4

To achieve 1-2ms pings use Nstreme. That is, set Wireless Protocol=nstreme

5

What did you want to achieve when you mived from ubnt to Mikrotik ? ie throughput, latency ??

6

Because the MikroTik SXT G-5HnD offers Gigabit Ethernet and was sold with 200 MBits real TCP throughput declaration.

SXT 5HnD is a low cost, high speed 5GHz wireless device. Dual polarization 802.11n and Nv2 TDMA technology help to achieve even 200Mbit real throughput speed

http://www.mikrotik-shop.de/Komplettsysteme/MikroTik-SXT-5HnD-Level-4::549.html

So where are my 200 MBits? :wink:

Have anyone achieved such high throughput in real world conditions in TCP-Transmission?

7

with btest,~40mbps is maximum speed because the cpu generates the data. Use a real file transfer in the link…and btw, those 200mbit are real 200mbit, not imaginary. UDP is still a real traffic but not predominant in a network, and you should learn to read the specs. In your link is : SXT 5HnD is a low cost, high speed 5GHz wireless device. Dual polarization 802.11n and Nv2 TDMA technology help to achieve even 200Mbit real throughput speed., it doesnt say anything about TCP speed that should be around 150mbps.