Compliance and Safety ManualH3C VG 10-10/10-11 Voice Gateway Chapter 3 Safety Information3-2Safety Symbol DescriptionElectric shock symbol: To suggest a danger of high voltageMicrowave symbol: To suggest a high-intensityelectromagnetic fieldLaser symbol: To suggest a strong laser beamSafety precautions are classified into the following levels: Danger, Warning, Cautionand Note.Danger: Suggests the possibility of a fatal accident or body injury if safety precautionsare ignored.Warning: Suggests the possibility of a major accident or severe injury, or equipmentdamage, if safety precautions are ignored.Caution: Suggests the possibility of a severe injury, or equipment damage, if safetyprecautions are ignored.Note: Suggests the possibility of an injury or equipment damage, if safety precautionsare ignored3.1.2 General RequirementsIn order to reduce the technically unavoidable residual risk to a minimum, it isimperative to follow the rules below:z Read all the instructions before operation.z Do not block ventilation openings while the system is on, and keep at least 5 cmdistance from ventilation openings and walls or other things which may block theopeningsz To reduce the risk of fire, use only No. 26 AWG or larger telecommunication linecordz No operation can be done on the device and cables when lightning.z To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits totelephone-network voltage (TNV) circuits.z For safety It is not recommended to wear jewelry and watch during operation ondevice.z Installation, configuration and disassembly must be done only by skillful personnelaccording to the documents concerned.z The unit/system must be operated by experts and authorized users only.z Any replacement or change to the system or parts of the system (including thesoftware) must be done by qualified or authorized personnel of Huawei-3Com.