19Checklist before installationTable 10 Checklist before installationItem Requirements ResultVentilation• There is a minimum clearance of 10 cm (3.9 in)around the inlet and exhaust vents for heatdissipation of the router chassis.• A ventilation system is available at the installationsite.Temperature 0°C to 45°C (32°F to 113°F)Relative humidity 10% to 95% (noncondensing)Cleanness • Dust concentration ≤ 3 × 104 particles/m3• No dust on desk within three daysESD prevention• The equipment and floor are well grounded.• The equipment room is dust-proof.• The humidity and temperature are at a properlevel, respectively.• Wear an ESD-preventive wrist strap and uniformwhen touching a circuit board.• Place the removed memory module, CF card, orHIM/MIM on an antistatic workbench, with theface upward, or put it into an antistatic bag.• Touch only the edges, instead of electroniccomponents when observing or moving a removedmemory module, CF card, or HIM/MIM.EMI prevention• Take effective measures to protect the powersystem from the power grid system.• Separate the protection ground of the router fromthe grounding device or lightning protectiongrounding device as far as possible.• Keep the router far away from radio stations, radarand high-frequency devices working in highcurrent.• Use electromagnetic shielding when necessary.Lightningprotection• The grounding cable of the chassis is wellgrounded.• The grounding terminal of the AC powerreceptacle is well grounded.• A port lightning arrester is installed. (Optional)• A power lightning arrester is installed. (Optional)• A signal lightning arrester is installed at the inputend of an external signal cable. (Optional)Installation siteElectricity safety• Equip an uninterrupted power supply (UPS).• In case of emergency during operation, switch offthe external power switch.
