Enabling Nstreme kills link

RouterOS Wireless Networking
1

I have a short 5 mile link that works perfect with the settings below, but all but dies when I enable nstreme. If I Uncheck nstreme, the link is good again, running at 78Mb

Boards: 433AH
Cards: SR17
Antennas: 32 Db dish with DP feed horns
Distance 5 miles
Db level 62-66

Using 5 Ghz N only

Both chains are checked and CCQ is 97-99%

1.HW Retries set to 15 on both sides
2.Data rates set to configured with all 802.11a rates disabled
3.MCS rate MCS12
4.Turned CSMA off
5.Enabled Polling
6.Best Fit framer
7.Periodic calibration disabled
8.HT Extension Channel “Above Control”

Had the tower installer come out and replace ends on one side, but it did not change anything.

2

how many db radio card power out?
62-66 for 5 miles and a 32dbi antenna is too low.
how much noise you have ? wath is your ccq?

try to reset configuration of your radio card and use default values. find a free frequency, enable nstream, check short preamble and try.
In no one case I fund nsteram worse than other protocols.

3

Had a typo. We are using SR71 5 Ghz radios.
CCQ is 97-99%

I have this same exact setup in several other locations and nstreme works great.

Three links originate from this same central tower. One points west and works perfectly, using nstreme (278Mb). Another points NE and also works fine with nstreme. The link that does not work with nstreme points east and works good (without nstream) at 78Mb. All links are using the same hardware and are the same distance apart.

4

can you disable the E and NE radios and see if this one is ok?
are frequency correctly spaced?

5

Try to upgrade to the V5.4, then on uncheck the Nsteme but set the wireless protocol=any.

then on the AP site, uncheck the Nstreme and set the wireless protocol=NV2, you should get better result.

and one more thing, try to re-align your antenna as within that distance, you should able to get <-55dbm with that antenna if you LOS is clear.

6

I will try that.

Just an fyi: We moved the radios to the base of the tower, so we have about 115-125 feet of LMR on each tower, which is why the dbs are off some.

7

ic, with that RF cable length, the signal is acceptable.
one more thing to highlight, try use only V5.4 but not the latest version.

8

Do you have a link for 5.4? I am not finding it. Just 4.17, and 5.7

9

http://download.mikrotik.com/routeros-mipsbe-5.4.npk

10

Hi,

From my experience, you should use NV2 for N Modulations, not nstream.

I have done a couple of tests and nstreme on N just kills the link, while NV2 can bring a big benefit for goodput.

I´m using NV2 with version 5.7 and it´s works pretty well.

Kindly regards,

11

I have a 5.3km link with nstreme best fit 3200, 802.11n, single chain, 5700-below channel, 150/150mbps, -65db, 100% ccq, tx power=0, -115 noise floor, ROS 4.17.

Uptime of the link: over 200 days

BUT i have tried nstreme with both chains in the lab with dual pol antenna ROS 5.6 and it was disconnecting every second. I don’t know why.

With nv2 everything was excellent.

12

I upgraded to 5.4. Currently I have HT-MCS set to 12 and have 78Mb. I have set it to 15 and got 130. I am wondering about the stats on the attached jpeg. How is it I have 100%CCQ, but TX/RX CCQ 65/64. Is this acceptable or do I need to make some changes to improve things?
wireless-ss.jpg