CPE210 Frequent dropouts?
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Did some more testing today. I could indeed set i to 0.05Km
All values as reported by CPE 210 selftest, average of three measurements
0.1Km 132 down 43 up
1Km 74 down 45 up
0.05Km 132 down 34 up
Changed from 20/40 to 20
85 down 15 up
Changed to 40
136 down 40 up
Testing against a fileserver 10 packets of 1Mb each gives 80MBps reading, 40 writing
Seems like it is prioritising download. Is that correct?
BTW, the Mbps in the throughput graph. Is that Megabyte per second och megabits per second.?
Ehm, yes, the distance precision is 2 digits after decimal point for manual and 3 digits if set to »Auto«, sorry. »Auto« works the better the larger the distance; for very short distances it computes wrong values. For the test I did manually set it to 0.01km, actual distance is 5m.
I get following the results in 802.11n-only mode.
20MHz channel width, WiFi speed index: MCS15 (144.4 Mbps WiFi rate, ~30% WiFi protocol overhead)
RX:
TX:
Bidirectional:
Link rates:
40MHz channel width, WiFi speed index: MCS15 (300 Mbps, ~30% WiFi protocol overhead)
RX:
TX:
Bidirectional:
Link rates:
There is some fluctuation of the results between the measurements due to interferences (17 APs around, 13 from neighbors, 3 indoor APs and 1 outdoor AP from me). Depending on activity of those foreign APs total throughput will decrease according to the amount of AirTime those APs need for sending data.
Over 50m (you wrote ~300m first) a CPE sees even APs located in the opposite direction due to reflections. 50m is no big distance for a CPE. You could try to decrease Tx power on such a short distance, but it will need lots of tests to get best settings for ideal throughput and IMO it's questionable whether this is worth the time to gain just a few Mbits/s.
Remember: WLAN is a shared medium. You can't expect an ideal environment. See what happens with the CPE's throughput if I send data to another WLAN link in the same room during a speed test between the CPEs (still at 40 MHz channel width with WiFi rate 300 Mbps):
Throughput on second (different) WLAN:
$ iperf -t 600 -i 10 -c 192.168.5.10
------------------------------------------------------------
Client connecting to 192.168.5.10, TCP port 5001
TCP window size: 129 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.5.205 port 64342 connected with 192.168.5.10 port 5001
[ ID] Interval Transfer Bandwidth
[...]
[ 3] 70.0-80.0 sec 22.0 MBytes 18.5 Mbits/sec
[ 3] 80.0-90.0 sec 19.8 MBytes 16.6 Mbits/sec
[ 3] 90.0-100.0 sec 20.0 MBytes 16.8 Mbits/sec
[ 3] 100.0-110.0 sec 19.6 MBytes 16.5 Mbits/sec
[ 3] 110.0-120.0 sec 11.4 MBytes 9.54 Mbits/sec
[ 3] 120.0-130.0 sec 7.75 MBytes 6.50 Mbits/sec
[ 3] 130.0-140.0 sec 19.6 MBytes 16.5 Mbits/sec
[ 3] 140.0-150.0 sec 19.5 MBytes 16.4 Mbits/sec
[ 3] 150.0-160.0 sec 19.9 MBytes 16.7 Mbits/sec
[ 3] 160.0-170.0 sec 640 KBytes 524 Kbits/sec
[ 3] 170.0-180.0 sec 13.9 MBytes 11.6 Mbits/sec
[ 3] 180.0-190.0 sec 20.9 MBytes 17.5 Mbits/sec
[ 3] 190.0-200.0 sec 19.5 MBytes 16.4 Mbits/sec
[ 3] 200.0-210.0 sec 19.9 MBytes 16.7 Mbits/sec
[ 3] 210.0-220.0 sec 20.5 MBytes 17.2 Mbits/sec
You can never predict which actual throughput you will get, since you never know who is sending data around your place on the same (or an overlapping) channel. That's why 20 MHz channel width (4 channels required) can result in better throughput than 40 MHz (8 channels required) in the 2.4 GHz frequency band.
