Hi All,
I've a customer setup a mesh link between 2 IAP-175 which are about 400 meters apart with clear LOS. Both IAPs are attached with an Ant 2x2 5614-U external antenna.
However we noticed that LED indictors on both did not go beyond 2 bars and the RSSI value always hovers around 35 ~ 40 dbm only. We ran an iperf throughput tests with a laptop connected to mesh point and mesh portal at the other end. The results showed that from the radios stats, the packets are transmitting at around 270Mbps and receiving at 300Mbps which is reasonable, however the channel utilisation is hitting only 39% and the throughput is only 80Mbps. This is very far off from the thoretical max of 150Mbps.
Primary-Point# show ap mesh ni eighbours
Neighbor list
-------------
MAC Portal Channel Age Hops Cost Relation Flags RSSI Rate Tx/Rx A-Req A-Resp A-Fail HT-Details Cluster ID
--- ------ ------- --- ---- ---- -------- ----- ---- ---------- ----- ------ ------ ---------- ----------
xxxxxxxxxx Yes 149+ 0 0 4.00 P 5d:15h:41m:23s HLK 39 300/300 1 1 0 HT-40MHzsgi-2ss 194c96b88cb7586fe383f80f89d96cc
Total count: 1, Children: 0
Tx HT 216 Mbps 72720
Tx HT 240 Mbps 281628
Tx HT 243 Mbps 500425
Tx HT 270 Mbps 37120968 <<<<<<<<<<<<<
Rx HT 240 Mbps 1215691
Rx HT 243 Mbps 371076
Rx HT 270 Mbps 82574913
Rx HT 300 Mbps 3144872160 <<<<<<<<<<<<
Channel Busy 1s 39 <<<<<<<<<<<<<<<<
Channel Busy 4s 43
Channel Busy 64s 39
Ch Busy perct @ beacon intvl 44 42 43 44 44 42 42 44 45 19 25 46 41 45 42 43 45 43 45 44 45 43 42 46 45 42 46 42 47 43
Rx Time perct @ beacon intvl 36 33 35 36 35 35 34 36 36 16 20 38 33 37 34 34 35 35 37 35 34 35 34 36 35 33 37 34 38 34
The iperf parameters we used at both sides are as follows :
Iperf –c 1.2.3.4 -w 512k -t 60 -P 4
Iperf –s -w 512k
Initially I suspect that there's some problem with the wifi NIC of the clients or some bottlenecks along the network path. But we did the same test with both same clients on the wired network and they are able to achieve > 900Mbps thoughput. So there should not be any issue with the machines.
Please advice how we can bump up the channel utilisation and throughput.
Thanks