STA receives strong signals from an AP, but the network speed is slow. How can I locate the problem


Locate the problem as follows:
1. Check the number of users associated with the AP. The number of associated users cannot exceed the upper limit allowed by the AP.
2. Check the channel and power of the AP. The channel and power must be set to fixed values, but cannot use default settings.
3. Change the connection mode on the AP to high-speed access.
4. Check whether upstream bandwidth limit is set on the AP.
5. Check antennas on APs:
- The interval between the antennas on different APs cannot be smaller than 10 m.
- The interval between the antennas on the same AP cannot be smaller than 7 m.
6. Use the dedicated tools to scan adjacent-channel interference. Check whether there is strong interference near the STA.

Other related questions:
Why is the signal strength that a STA receives from an AP weak
The possible causes are: - The transmit power of the AP is low. In this case, increase the transmit power. - The antenna system of the AP (indoor DAS AP) is not properly deployed. 1. The output power on antenna interfaces is low because the AP connects to excess antennas. Or the feeder lines are too long. 2. The passive devices (combiner, splitter, and coupler) do not comply with design principles or specifications or are not properly connected. 3. The passive devices have unloaded interfaces. - The STA is far away from the AP's antennas, so the signal loss is large. - Signals are blocked by a beam, post, concrete wall, metal door, or other obstacles between the STA and antennas. In this case, change the antenna installation positions.

If the STA roaming speed is slow, how can I handle it
The causes and solutions for slow STA roaming speeds are as follows: 1. The roaming sensitivity of STAs is not properly configured on the AC. Adjust the roaming sensitivity of STAs. 2. The network is not properly planned. Optimize the network plan. 3. AP signal interference exists. Scan AP channels to eliminate interference. 4. Users use different security policies. The roaming time of a STA using WEP is smaller than that of a STA using WPA. Select proper security policies based on actual requirements. 5. STAs switch between different channels during roaming. The roaming time of a STA that switches from channel 1 to channel 6 is smaller than that of the STA that switches from channel 11 to channel 6. Slow handover may cause packet loss during roaming. It is normal if only 1 to 2 packets are lost in this process.

How do I obtain the Visual Schedule Desktop (VSD) installation software?
You can obtain the Visual Schedule Desktop (VSD) installation software as follows: Visit the SMC2.0 software download page at Select the version. The VSD installation file is VsdInstall.exe, which can be installed on a Windows PC.

How do WLAN devices restrict access from weak-signal STAs
For details about how to configure an AC to restrict access from weak-signal STAs, see: V200R005: Restricting Access from Weak-Signal or Low-Rate STAs V200R006: Configuring Smart Roaming

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