What precautions should be taken for using AR routers

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Take the following precautions when using AR routers:
1. Routers are powered by high-voltage power sources. High voltage may cause body injuries or even death. Do not open the chassis unless instructed by professionals.
2. Ground the routers properly to protect the routers from lightning.
3. A router has many ESD-sensitive components. Before touching a router, a board or an Application Specific Integrated Circuit (ASIC) chip, wear an ESD wrist strap and connect one end of the wrist strap to the ground. This prevents the ESD-sensitive components from being damaged by the static electricity generated by the human body.
4. AR routers support various WAN interfaces, including GE, FE, ADSL2+, G.SHDSL, FXS, FXO, ISDN, E1/T1, and SA/AS interfaces. The interface connectors are similar. Before connecting cables to WAN interfaces, read the instructions on the panel carefully to ensure that correct cables are connected to the interfaces.
NOTE:
For more information about use of AR routers, see the product description.

Other related questions:
What should I notice when using optical fibers
Introduction to optical fibers: The connector type of an optical fiber is the same as the interface type of the optical module to which the optical fiber is connected. Connector types of optical fibers include LC, SC, FC, ST, MU, and MPO. LC connectors are most widely used. Optical fibers are classified into multimode and single-mode optical fibers: - Most of multimode optical fibers are orange, but a few multimode optical fibers are other colors. For example, optical fibers with MPO connectors are light green. Multimode optical fibers can be used with multimode optical modules to implement low-cost, short-distance transmission. - Single-mode optical fibers are yellow. They can be used with single-mode optical modules to implement long-distance transmission. Precautions for using optical fibers: - The bend radius of optical fibers must be larger than the minimum bend radius allowed by the optical fibers. Otherwise, the optical modules will be damaged, and quality of optical signals will degrade. - Do not look into an optical interface without eye protection, or the laser may hurt your eyes. - It is recommended that idle fiber connectors be covered with dust-proof caps to keep the fiber connectors clean. An unclean fiber connector may degrade the quality of optical signals or even cause link failures or error codes on the link.

Functions of the multicast-source-deny command on an S series switch
For S series switches excluding the S1700, the multicast-source-deny command filters out multicast data packets in a VLAN on a Layer 2 interface. After this command is executed on a Layer 2 interface, multicast data packets received from the specified VLAN are dropped on the interface. By default, an interface is disabled from filtering out multicast data packets sent from specified VLANs. This command can filter out only multicast data packets transmitted over UDP. Multicast data packets received from the specified VLAN are not dropped on the interface if they do not contain the UDP protocol field.

Does an S series switch enabled with IGMP snooping querier participate in IGMP querier election
After IGMP snooping querier is enabled on an S series switch, the switch periodically sends Query messages to users in a VLAN but does not participate in IGMP querier election or forward Query messages to a VLAN. Layer 2 multicast querier is used when the switch connects to no upstream Layer 3 device or when the IGMP querier function is not enabled on the upstream Layer 3 device. If an IGMP querier exists on the network, do not enable the IGMP snooping querier function on the switch. This is because this function affects querier election on the upstream Layer 3 device and causes multicast service failures.

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