User manual 3COM LS-S3610-52P-OVS

[. . . ] H3C S3610 Series Ethernet Switches Installation Manual Hangzhou H3C Technologies Co. , Ltd. http://www. h3c. com Manual Version: T2-20080526-C-1. 07 Copyright © 2006-2008, Hangzhou H3C Technologies Co. , Ltd. and its licensors All Rights Reserved No part of this manual may be reproduced or transmitted in any form or by any means without prior written consent of Hangzhou H3C Technologies Co. , Ltd. Trademarks H3C, , Aolynk, , H3Care, , TOP G, , IRF, NetPilot, Neocean, NeoVTL, SecPro, SecPoint, SecEngine, SecPath, Comware, Secware, Storware, NQA, VVG, V2G, VnG, PSPT, XGbus, N-Bus, TiGem, InnoVision and HUASAN are trademarks of Hangzhou H3C Technologies Co. , Ltd. All other trademarks that may be mentioned in this manual are the property of their respective owners. Notice The information in this document is subject to change without notice. [. . . ] Do not place the switch on an unstable case or desk. The switch might be damaged severely in case of a fall. Ensure proper ventilation of the equipment room and keep the ventilation vents of the switch free of obstruction. Make sure that the operating voltage is the same one labeled on the switch. Do not open the chassis while the switch is operating or when electrical hazards are present to avoid electrical shocks. When replacing interface cards, wear ESD-protective gloves to avoid damaging the cards. 2. 2 Installation Site The S3610 series must be used indoors. You can mount your switch in a rack or on a tabletop/workbench, but make sure: Adequate clearance is reserved at the air inlet/exhaust vents for ventilation. The rack or table/workbench has a good ventilation system. The rack is sturdy enough to support the device and its accessories. The rack or table/workbench is well earthed. To ensure normal operation and long service life of your VG, install it in an environment that meets the requirements described in the following subsections. 2. 2. 1 Temperature/Humidity You must maintain a proper temperature and humidity in the equipment room. Long-term high humidity may lead to bad insulation, electricity leakage, mechanical property changes, and corrosion. However, if the relative humidity is two low, captive screws may become loose as the result of contraction of insulation washers and static electricity may be produced in a dry environment to jeopardize the CMOS circuits on the device. High temperature is the most undesirable condition, 2-1 Installation Manual H3C S3610 Series Ethernet Switches Chapter 2 Installation Preparation because it accelerates aging of insulation materials and can thus significantly lower reliability and service life of your switch. 2. 2. 2 Cleanness Dust is a hazard to the operating safety of your device. The dust accumulated on the chassis can be adsorbed by static electricity and result in poor contact of metal connectors or metal contact points. This can not only shorten the service life of your device but also cause communications failures. When the relative indoor humidity is low, electrostatic adsorption is more likely to happen. The contents of the dust must be limited as shown in the following table: Table 2-1 Dust content limits in an equipment room Substance Dust Unit 3 × 10 Particles/m³ Content 4 (No visible dust on the tabletop for three days) Remark: the diameter of a dust particle 5 m Besides dust, there are rigorous limits on the harmful gases that can accelerate the erosion and aging of metals, such as salts, acids, and sulfides, as shown in the following table. Table 2-2 Harmful gas limits in the equipment room Gas SO2 H2S NH3 Cl2 0. 2 0. 006 0. 05 0. 01 Maximum (mg/m3) 2. 2. 3 Electromagnetic Susceptibility The operation of your switch can be affected by external interferences, such as conducted emission by capacitance coupling, inductance coupling, electromagnetic wave radiation, and common impedance (including the grounding system) coupling, and leads (power cords, signaling cables and output wires. To eliminate the interferences, make sure to: For the AC power supply that adopts TN system, use a monophase three-line power socket with Protection Earth (PE) to effectively filter interference from the power grid. 2-2 Installation Manual H3C S3610 Series Ethernet Switches Chapter 2 Installation Preparation Keep the device far from radio transmitting stations, radar stations, and high-frequency devices. Use electromagnetic shielding when necessary, for example, use shielded interface cables. Route interface cables only indoors to prevent signal ports from getting damaged by overvoltage or overcurrent caused by lightning strikes. 2. 2. 4 Laser Safety The S3610 series are class-1 laser devices. [. . . ] You should correctly locate the problem, whether it is caused because the ground wire of the arrester is not well grounded or because the live and zero wires are connected in reverse direction. You may check that in the following way. When the red LED is on, use a multimeter to examine polarity at the power socket of the arrester. If it is same to that of the power socket in the equipment room, it means that arrester is not well grounded. [. . . ]