Hello Folks!
The past weekend I did our first test putting up mikrotik link using SXT and AC/N to another SEXTANT A/N.
But I face a problem, the link goes up to 300/300 sometimes only 270/270 and it always start at 6/6 and does not go up to 300/300 till there has been some traffic for a while over the link.
I have wireless default settings and use nv2 and put the frequency and domain for my country only.
Any hints or tip ?
This is normal. Data rate will always stay on the lowest, until you start some traffic. This is how wireless links should work
If you’re confident the link will never drop to very low speeds, you can disable the lower data rates so that it only ever “starts” at something reasonable.
The problem I’ve found with starting at 6mbps is that the “newly associated client” will slow the whole AP down until it “trains up” to a faster speed. Which can take several seconds. Bad for QoS.
Rich
Which wireless protocol?
Wireless protocol: NV2
Band: 5GHz-A/N_AC
Channel width: 20/40/80MHz eeeC
NV2.
In fact I saw a couple of issues. One as explained above - when a new station associates it starts at the lowest rate. All is fine until the new station starts transmitting. It will then draw down the AP to it’s level until it finishes training to a higher rate.
Second issue is when a station disconnects whilst passing traffic. The AP sits there for 5 seconds (seemingly retransmitting to the dead client until timeout) during which time the other clients are starved. I think the AP tries to send at the basic rate to this dead client for up to 5 seconds before it disassociates the client and resumes normal speed. Honestly not too sure on the technical facts, but observations were real.
Now, I’ve not repeated this in the lab in recent versions. I reported it as a bug a while back (I think circa 6.22) and MT replied they made some improvements. Didn’t see any immediate improvement in the next release, but may have been in a later release which I didn’t try.
Rich
We see improvements with nv2 and .ac. Our first tests in LAB gave very instable results with nv2. Esp. doing bidirectional Bandwidth tests we saw bad flucutations.
Now with 6.30/wireless-cm2 we get reasonable results in lab. We dont get stable 400MBbps40MHz/2S/SGI but see quite stable bandwidthtest >230MBit aggregated UDP with 40MHz Channel and >120MBit aggregated with a 20 MHz Channel.
There is still room for improvements but it looks like a real upgrade to 11n now.
Having to use higher channel width for higher throughput in a unlicensed band and is becoming more over crowded with less and less clean air is a major issue for most of us, someone may have to “re-invert the wheel” for more throughput for less channel width not more?
Hello Folks!
Today we upgraded to RoS 6.31 and wireless-cm2. All our links now is rock solid Tx 300/Rx 300 and CCQ is 99-100% at all times for our N clients, yet we do not have any AC clients, my distributor tell me that AC is for the time being mainly for links, AC PTMP is not yet fully developed.
We did check for noice ans disturbance in our environment but did not find any wireless networks or any other radio source using our band, not before and not today either, so it must be some kind of improvement in RoS 6.31 as far we can see.
Customers also confirm that network become more rapid in response after the upgrade, before it was little sluggish but not slow. It simply did not give full speed directly but after some moments like 15-30 seconds.
Lets see what happens!
Steen, what protocol you are using with 6.31? Did you try 6.31 with wireless-fp ?
I am using protocol nv2 and wireless-cm2.
/interface wireless> /system package print
Flags: X - disabled
0 routeros-powerpc 6.31
1 system 6.31
2 wireless-cm2 6.31
3 ipv6 6.31
4 X wireless-fp 6.31
5 X hotspot 6.31
6 dhcp 6.31
7 X mpls 6.31
8 routing 6.31
9 X ppp 6.31
10 security 6.31
11 advanced-tools 6.31
I discovered today that I interfere with myself (splattering myself) the AP distributing AC to some clients have frequency to close ot another of my access points. AC can use up to 80MHz, and in my case the lowest AC frequency from the base carrier that is set in router board is only 20MHz from the other Access point base carrier. More frequency separation is needed (usually I have 100MHz if possible, but I have not so far correcting it.
Hello Folks!
I now added a few more customers to the AC network, they all get a steady 50-70Mbit/s down and upstreams, 80-85Mbit/s commonly and rarely 90-95Mbit/s.
With the old 54Mbit/s wifi they got average 20Mbit/s down and upstreams, and common 22-25Mbit/s and rarely 30-35Mbit/s.
NV2 is used, and standard settings as it comes from Mikrotik.
Channel size, cpes/Sector, signals, only ac ?
I am recycling cm9, r52 and similar cards. They are able to pass 53Mbits in 40mhz channel on single polarity. Not so bad on some places still. Just for comparison…
I also tried that, R52 5Ghz band, in 40MHz (turbo) mode using RB411 boards, 21dbI directional antennas, all claiming 108Mbit/s links in both directions, SN=56db, Tx/Rx Signal Strength -40dBm, Tx/Rx CCQ 100% / 100%
on horizontal polarity, and NV2 protocol, PTMP, but I never managed to pass 20Mbit/s - 30Mbit/s in real world.
Did you do any special settings ? I had problem at some places where SN and CCQ went down, my environment is City Like.
Any special settings, just using 802.11 instead NV2. Even I do not need 53Mbits, so I switched it to 20Mhz. It pushes 24-26Mbits steadily with -61-65dbm signal level, 34db SNR with 100% ccq. AP bridge to station bridge modes, with regulatory domain on and with 18db 20/6 degree panel antenna. The power is maybe reduced too much, but it works, so why to radiate uselessly? -100dbm noise floor on that frequency.
Channel size: 20/40/80MHz eeeC
Frequency: 5660MHz (need to go higher, have some splatter from another AP at lower frequency, need more separation)
SN: 80dbm and down to 50db on some distant cpe:s
Tx/Rx Signal strenght; 23db/22db
Tx/Rx CCQ: 98-100%
CPE/Sector: <10
City like environment.
We do have some cpe left in each sector who can not do AC, but all seems to work well so far.