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Wireless issues

Ranamohit54
Frequent Visitor
Frequent Visitor

I have a situation where the user is able is having slow connection issues when in a room connected to the same AP . but its perfectly fine when outside that room .

RSSI and SNR are -51 and 44 db respectively .
The AP is just outside the room. Users connected to the same AP outside the room doesnt have any issues at all. Connection speed when checked on WLC is 400mbps when outside the room for the user. and when inside the room its 1mbps. I have checked with multiple users the issue remains.

There are no channel interference i can confirm that. this AP has the same profile as that other AP's on the same floor. nothing different on this particular AP.

I have checked the WLAN report , and compared for both user is inside the room and outside the room . i couldnt find anything that may be creating the issue.

I can provide you the debug reports if someone can please help.

18 Replies 18

Rich R
VIP
VIP

there is no AP inside the room .
Then the walls to the room must be radio-opaque and blocking the signal from the AP.
In that case your only option is to install an AP in the room.
You should have conducted a post-install survey to check for coverage of your installation.  Then you would have spotted any spaces with inadequate cover.

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TAC recommended codes for AireOS WLC's   and   TAC recommended codes for 9800 WLC's
Best Practices for AireOS WLC's,   Best Practices for 9800 WLC's   and   Cisco Wireless compatibility matrix
Check your 9800 WLC config with Wireless Config Analyzer using "show tech wireless" output or "config paging disable" then "show run-config" output on AireOS and use Wireless Debug Analyzer to analyze your WLC client debugs
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- Fixed in 8.10.196.0, latest 9800 releases, 8.5.182.12 (8.5.182.13 for 3504) and 8.5.182.109 (IRCM, 8.5.182.111 for 3504)
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Field Notice: FN74035 - Wave2 APs DFS May Not Detect Radar After Channel Availability Check Time
Leo's list of bugs affecting 2800/3800/4800/1560 APs
Default AP console baud rate from 17.12.x is 115200 - introduced by CSCwe88390

travisstacy759
Community Member

Thank you for sharing such detailed information! You've already covered a lot of critical areas, which helps narrow down the possible causes. Given the significant drop in speed when users move inside the room, it sounds like there might be a physical or environmental factor within that specific room impacting the signal, even if the RSSI and SNR values appear solid.

Here are a few things to consider trying:

  1. Reflection or Absorption: Sometimes, certain materials in walls, furniture, or even particular objects can reflect or absorb signals differently, causing drastic speed drops. If feasible, try moving some objects or repositioning the AP to see if it affects the connection quality.

  2. Multipath Interference: Even without channel interference, signal reflection within the room can cause multipath issues, leading to inconsistent performance. This is often observed in rooms with lots of metallic or reflective surfaces.

  3. Testing with Another AP: If possible, you could test with a different AP temporarily to rule out any specific hardware-related quirks with the current AP.

  4. Lowering Power Output: Sometimes reducing the AP’s transmit power can improve performance within confined spaces as it might reduce signal reflection.

If you can provide the debug reports, that would be great! We’ll look out for any clues in those logs that might explain this room-specific connectivity issue.

Scott Fella
Hall of Fame
Hall of Fame

Like what others have mentioned, it might be the material in that wall causing your issue.  You can try to move that ap over close to the door, so its not having to penetrate that wall, but the door and window. You also can test, but putting an ap inside that room and testing signal outside the room to see how your signal really is. Reverse engineer it so it makes sense.

-Scott
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activadorr1
Visitor

Use RF analysis tools to measure signal strength, noise levels, and interference patterns within the room and surrounding areas

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