I have inherited a network with significant wireless demands and it is having problems. My background is in application development so please understand if I have some erroneous assumptions.
- Slow response less than 1 mps
- Dropped connections
- Comcast Modem (up to 150 mps)
- ZyWall USG 100 (Manages 4 VLANS with DHCP for 200 ip addresses each)
- NetGear 24 Port POE Switch (GS728TP)
4 ports go to 4 Ruckus 7376 AP
- All Cat5E cables
- All devices noted to be 10/100/1000
- 60+ Students on wireless laptops
- 10+ staff laptops and tablets
- 5-10 guests (phones, etc...)
- The APs are set to give out at most 3Mps per station (Rate Limit per SSID). So my assumption is 80-100M reliable throughput / 80 = 1+ mbps average throughput per station. I am seeing .4 Mbps or dropped wireless connections.
- With less than 25 users on the wireless network things seem to be fine.
- Most of the users connect through 2 of the APs and are in close proximity to each other with their devices. I am not sure if the APs just cannot handle that many stations or if there is just too much noise and the APs are getting confused. The APs are set to 40mhz which is suppose to allow up to 300Mps throughput.
- I have noted Packet Error Rates of 40-80% during high volume periods
- The firewall resources show less than half utilization, but my reading has told me not to rule out getting a better firewall. Is it taking to much time for the firewall to relay DCHP information.
- The APs run on only 2.4 Ghz. (that was how it was orginaly setup). I am unsure on how to get the figures regarding the channel utilization.
- During peek times there are an average of 36 device trying to connect through one AP.
- Just checked and all priority devices use Dell Wireless 1506 802.11b/g/n (2.4) cards. So no benefit I can see for setting up 5Ghz connections.
Overall direction and recommendations on how to narrow down problem device or service.
Thanks for any advice!
Direction Taken As of 10/28/2014
A sight survey was done previously from what I am told (they did not leave any documentation), but they never took into account the number of intended devices and proximity.
I have also disabled Wireless B connections with out much improvement from what I can tell.
Since all the important devices only operate on 2.4 Ghz and we are getting significant noise issues, I believe that if a move one AP directly into one room and move another AP (rarely used), into the room across the hall. Setting them up using the channels 1 and 11 (non overlapping channels) at 20Mhz would allow for reduced devices per AP and better connection (less noise on one channel). Also, setting the Level to low.
GOOD NEWS as of 10/29/2014
So far the changes made have shown a huge improvement. Here are the key notes
- 3 APS instead of 2
- re-positioning APs
- Non-overlapping channels 1,6,11
- Power Level set to Half or Lower