H3C SR6608/6604 Routers Installation Manual Chapter 4 Preparing for Installation4-5z Take effective measures to protect the power system from the power grid system.z Separate the protection ground of the router from the grounding device or lightningprotection grounding device of the power supply equipment as far as possible.z Keep the router far away from radio stations, radar, and high-frequency devicesworking in high current.z Use electromagnetic shielding when necessary.4.1.6 Lightning ProtectionAlthough many measures have been taken to protect the device from lightning, if thelightning intensity exceeds a certain range, damage to the router may still happen. Toprotect the router from lightning better, you are recommended to do as follows:z Ensure the PGND cable of the chassis is well grounded. Refer to section 5.5“Connecting the PGND Cable” in Chapter 5 “Installing the Router”.z Ensure the grounding terminal of the AC power socket is well grounded.z Install a lightning arrester at the input end of the power supply to enhance thelightning protection capability of the power supply.z Install a special lightning arrester at the input end of outdoor signal lines (forexample, E1 line) to which interface modules of the router are connected toenhance the lightning protection capability.Note:For the installation of a power lightning arrester and a signal lightning arrester, refer tosection 5.7 “Installing a Power Lightning Arrester (Lightning Protection Busbar)(Optional)” and section 5.8 “Selecting and Installing a Signal Lightning Arrester(Optional)” in Chapter 5 “Installing the Router”.4.1.7 Cabinet-Mounting RequirementsWhen installing the router in a cabinet,z Install the router in an open cabinet if possible. If you install the router in a closedcabinet, make sure that the cabinet is equipped with a good ventilation system.z Install the router on a shelf in view of the heavy weight of the router.z Make sure that the cabinet is sturdy enough to support the weight of the router andinstallation accessories.z Make sure that the size of the cabinet is appropriate for the router, and that there isenough clearance around the left and right panels of the router for heatdissipation.z For the sake of heat dissipation and device maintenance, it is recommended thatthe front and rear of the cabinet should be at least 0.8 m (31.5 in.) away from walls