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This post talks about most asked questions about Huawei WLAN products.
AP Online Failure: Version Mismatch | [WLAN]Q&A: Which Devices Can Manage Fit APs? | A: In addition to WLAN ACs, some switches and AR routers can manage Fit APs. |
| [WLAN]Q&A: What Does ver-mismatch or vmiss Mean? What Measures Should Be Taken When ver-mismatch or vmiss Is Displayed? | A: If the AP state is ver-mismatch or vmiss, the software version of the current AP does not match that of the AC. | |
| [WLAN]Q&A: How Do I Configure Automatic Upgrade When an AP Goes Online? | A: In automatic upgrade mode, an AP checks whether its version is the same as that configured on the AC, SFTP server, or FTP server when the AP goes online. If the two versions are different, the AP upgrades its version, restarts, and goes online again. This mode applies to scenarios where APs have not gone online on the AC. | |
| [WLAN]Q&A: How Do I Check the AP Models Supported by the AC of the Current Version? | A: Run the display ap-type all command on the AC to check all AP models supported by the AC. | |
| [WLAN]Q&A: What Is the Version Mapping Between ACs and APs? | A: Before configuring the WLAN, ensure that the AC version matches the AP version. Otherwise, the APs may fail to go online. The following figure lists the version mapping between ACs and APs. | |
| [WLAN]Q&A: Why Does an AP Restart Repeatedly When Going Online After Automatic Upgrade Is Configured? | A: If the automatic upgrade configuration is incorrect, the AP may fail to be upgraded automatically. In this case, the AP restarts to restore the configuration. If the configuration is still incorrect after the AP is restarted, the preceding process is repeated when the AP goes online. As a result, the AP restarts repeatedly when going online. | |
| AP Online Failure: IP Address Assignment | [WLAN]Q&A: In Which Modes Can an AP Obtain an IP Address? | A: An AP can obtain an IP address in any of the following modes: Static mode, DHCP mode, and Stateless address autoconfiguration (SLAAC) mode. |
| [WLAN]Q&A: How Do I Configure APs to Go Online in Static Mode? | A: Log in to an AP and perform the following configurations: 1. Configure the mode in which the AP obtains an IP address 2. Configure the IP address and gateway address for the AP to go online in static mode. 3. Specify the IP address of the AC. 4. Restart the AP to make the configurations take effect. | |
| [WLAN]Q&A: How Do I Configure APs to Go Online in DHCP Option 43 Mode? | A: Run any of the following commands to configure the Option 43 field.
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| [WLAN]Q&A: When Both Option 43 and Static Modes Are Configured for APs to Go Online, Which Mode Takes Effect Preferentially? | A: There is no priority for these two modes to take effect. If the Option 43 and static modes are both configured but IP addresses of different ACs are specified, APs establish CAPWAP links with the AC that first responds to the Discovery Request packet from the APs. | |
| [WLAN]Q&A: In Which Mode Does an AP Obtain the IP Address of an AC? What Are the Recommended Modes and Why? | A: APs obtain the IP address of an AC through Layer 2 CAPWAP broadcast packets, Option 43 in Layer 3 packets, or DNS server. The AC IP address can also be manually specified on APs. The Option 43 mode is recommended. This mode is not subject to Layer 2 networking, and no deployment or modification of a DNS server is required | |
| [WLAN]Q&A: How Can I Know Whether an AP Has Obtained an IP Address? If an AP Fails to Obtain an IP Address, How Do I Troubleshoot the Fault? | A:
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| Antenna | [WLAN]Q&A: What Types of Antennas Are Supported by APs? | A: Antenna Classification by Horizontal Radiation Pattern: Omnidirectional antenna, Directional antenna, and Smart antenna. Antenna Classification by Polarization Mode: single-polarized antenna and dual-polarized antenna. |
| [WLAN]Q&A: What Is the Antenna Gain? | A: Antenna gain is the ratio of the power density in a given direction to the power density of a reference antenna (using an ideal radiation source) in the same direction. | |
| [WLAN]Q&A: What Is the Receiver Sensitivity? | A: Receiver sensitivity refers to the minimum signal received power on an antenna port for receivers to accurately decode a given signal. Receiver sensitivity can be degraded by inter-system interference, affecting the quality of received signals. Therefore, receiver sensitivity is usually used as a criterion to protect the interfered system. | |
| [WLAN]Q&A: What Is the Beamwidth? | A: Beamwidth is the angular separation between the points in the main lobe that are down from the maximum gain by 3 dB. The angle is called the lobe angle. | |
Radio and Network Planning | [WLAN]Q&A: What Is the Wireless Network Coverage? | A: An AP transmits radio signals through an antenna and generates a wireless network coverage area around the antenna. Generally, the area where the signal strength around an antenna is greater than the edge field strength is called wireless network coverage area. |
| [WLAN]Q&A: What Are The Common Wireless Network Optimization Methods | A: Configure channel and power calibration Set the RTS/CTS threshold Disconnect weak-signal STAs Configure user-based rate limit …… | |
| [WLAN]Q&A: Basic Concepts of Power and Signal Strength | A: RSSI = Radio transmit power + TX antenna gain – Path loss – Signal attenuation caused by obstacles + RX antenna gain | |
| [WLAN]Q&A: How to Calculate The Maximum Transmission Distance | A: The coverage range of each AP can be calculated or obtained through simulation using tools. | |
| Upgrade | [WLAN]Q&A: Upgrade Compatibility of New Hardware Version AP | A: The hardware of some Huawei APs has been upgraded. These APs are incompatible with earlier software versions and can only match new software versions. Therefore, there are upgrade or downgrade restrictions for these APs. Existing APs before hardware upgrade are compatible with new software versions. |
| Others | [WLAN]Q&A: How to Calculate the Link Setup Rate of the Wi-Fi Air Interface? | A: The link setup rate of the Wi-Fi air interface is determined by five factors: the number of spatial streams, symbol and guard interval (GI), modulation mode, code rate, and number of valid subcarriers. |
| [WLAN]Q&A: How the Uplink/Downlink Signal Power Is Improved by Increasing the AP Antenna Gain | A: Increasing the AP antenna gain can improve the uplink and downlink signal power. | |
| [WLAN]Q&A: What is a high-density AP? | A: High-density APs are applicable to high-density scenarios such as the lecture hall, stadium, and airport departure lounge, for example, Huawei AP4050DN-HD and AP8050TN-HD. | |
| [WLAN]Q&A: What Is the Capacity of nxn MIMO? | A: In Wi-Fi transmission, transmission media of each link are not independent of each other. As one more TX/RX group is added, the throughput capacity can be doubled to the maximum. | |
| [WLAN]Q&A: Understanding the Number of STAs | A: Number of STAs: Number of STAs in a specific space, regardless of whether they are connected to a Wi-Fi network Number of STAs connected to a Wi-Fi network: Number of STAs that access a Wi-Fi network in a specific space, regardless of whether wireless traffic is transmitted between the AP and STAs (This is the commonly known "number of access STAs.") Number of concurrent STAs accessing a Wi-Fi network: Number of STAs that access a Wi-Fi network in a specific space and are simultaneously transmitting data (This is the commonly known "number of concurrent users.") |
