How are antennas classified

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By function: communication antenna, TV antenna, and radar antenna
By frequency band: short-wave antenna, untrashort-wave antenna, and microwave antenna
By direction: omnidirectional antenna and directional antenna
By shape: linear antenna and plane antenna

Other related questions:
Types of Huawei antennas
Indoor antenna: - Indoor omnidirectional/directional ceiling-mounted antenna - Indoor directional antenna - Indoor SMA antenna Outdoor antenna: - 2.4G&5G outdoor omnidirectional antenna - 2.4G&5G outdoor directional antenna - Outdoor backhaul antenna

How to classify the interfaces of AR routers
For AR routers: Interfaces of a device are used to exchange data and interwork with other devices and can be classified into physical interfaces and logical interfaces, in which: 1. Physical interfaces are real interfaces supported by components and can be further classified into management interfaces and service interfaces. - Management interfaces: Management interfaces are used to support the configuration and management operations performed by users. Users can use management interfaces to log in to devices and perform configuration and management operations. Management interfaces do not transfer service data. - Service interfaces: Service interfaces are used to transfer service data and can be classified into LAN interfaces and WAN interfaces. LAN interfaces can be used by routers to exchange data with network devices in the LAN. WAN interfaces can be used by routers to exchange data with devices in the external networks which are far away from the routers. 2. Logical interfaces can implement data exchange but do not exist physically and must be established by configurations. Logical interfaces transfer service data.

How to select antennas for APs
Antennas receive and send radio signals. Select antennas for APS by referring to HUAWEI Access Points Antenna Quick Start. Contact Huawei local offices to purchase antennas. Antennas from other vendors are not recommended for working with Huawei APs. Consider the following points when selecting antennas: 1. Usage scenario and purpose Indoor antennas are generally used to provide signal coverage in indoor scenarios while outdoor antennas are used to provide signal coverage and bridging backhaul in outdoor scenarios. 2. Local standards and regulations The transmit power and maximum gain of antennas must strictly comply with local standards and regulations. 3. Shape and distance of the coverage or backhaul area - Coverage: Directional antennas are recommended in long and narrow areas while omnidirectional antennas are recommended in round and square areas. - Backhaul: Directional antennas are usually used. If the backhaul distance is long, use high-gain antennas; if backhaul targets are concentrated, use small-angle antennas. 4. Signal transmission band (2.4 GHz/5 GHz) - Coverage: To provide 2.4 GHz and 5 GHz signal coverage, use 2.4Gand 5G antennas in the same area or use dual-band antennas. - Backhaul: Only 5 GHz antennas are used for backhaul.

How many types is the Flume Sink classified into?
A Sink must function with a specific Channel. Typical Sink types are as follows: 1. Sinks that send stored data to the final destination, such as HDFS and HBase 2. Sinks that are consumed automatically, for example, Null Sink 3. IPC Sinks used for communication between Agents, such as Avro

Recovery plan types of OceanStor ReplicationDirector
OceanStor ReplicationDirector (current major version: V100R003C10) provides two types of recovery plans: 1. Local recovery plan Based on a snapshot protection policy template, a local recovery plan is executed to roll back data. 2. Remote recovery plan Based on a remote replication protection policy template, a remote recovery plan is executed to perform planned migration or fault recovery.

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