What is the roaming mechanism of APs

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A roaming process is initiated by the STA. A STA may roam when it detects signals of a new AP which are stronger than that of its currently associated AP. A larger signal strength difference indicates a higher roaming possibility. Roaming aggressiveness of STAs varies. Some STAs support manual configurations of roaming aggressiveness on NICs.

Other related questions:
Do APs support power adjustment and what is the power adjustment mechanism
Power adjustment is similar to channel adjustment. When an AP goes offline, the AC adjusts the power of neighboring APs to compensate for the coverage hole.

WLAN roaming
WLAN roaming allows STAs to move within the coverage areas of APs belonging to the same ESS with nonstop service transmission. The most obvious advantage of WLAN networks is that a STA can move within a WLAN network without physical media restrictions. WLAN roaming allows STAs to move within a WLAN network without service interruption. An ESS includes multiple APs. When a STA moves from an AP to another, WLAN roaming ensures seamless transition of STA services between APs. WLAN roaming has the following advantages: - Retains STAs' IP addresses. After roaming, STAs can still access the initially associated WLAN network and retain their services. - Avoids packet loss or service interruption caused by long-term authentication.

How to configure key negotiation between STAs and APs for roaming
Key negotiation between STAs and APs can only be configured in V200R003. The configuration procedure is as follows: [AC-wlan-view] ap-profile name huawei id 1 //Create AP profile huawei. [AC-wlan-ap-prof-huawei] 4-way-handshake ap //Configure key negotiation between a STA and an AP. [AC-wlan-ap-prof-huawei] quit [AC-wlan-view] ap id 1 [AC-wlan-ap-1] profile-id 1 [AC-wlan-ap-1] quit [AC-wlan-view] commit ap 1 //Deliver the configuration to the AP. Warning: Committing configuration may cause service interruption,continue?[Y/N]y

Mechanism of automatic transmit power adjustment for APs
APs support automatic adjustment of the transmit power, and the adjustment mechanism is similar to AP channel calibration. In AC+Fit AP networking, when an AP goes offline, the AC adjusts the power of neighboring APs to compensate for the coverage hole.

Indicators of a mechanical VOA
Question: Description of indicators related to a mechanical VOA. Answer: For example, Optical Tunable Attenuator,Manual(Single),1300~1610nm,2~30dB,2.0dB,40dB,2mm*2.5m LC/PC. The indicator description is as follows: 1300~1610 nm: supported wavelength range 2~30 dB: supported attenuation range 2.0 dB: insertion loss 40 dB: echo loss 2mm*2.5m: pigtail diameter and length LC/PC: optical fiber connector type. The return loss refers to the ratio of optical power returned from the input port of passive components to input optical power. The formula is as follows: RL = -10 log (Pr/Pj) Pj refers to the optical power sent to an input port. Pr refers to the optical power received from the same input port. Generally, the return loss of a fixed optical attenuator is 45 dB; the return loss of a mechanical variable attenuator is 40 dB or 55 dB. A larger return loss value indicates smaller optical power returned by the same optical port on a passive component and better the attenuator performance.

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