Huawei NE05E Hardware Manual page 405

HUAWEI NE05E,NE08E
Hardware Guide
Fire protection
For small equipment rooms, a certain number of portable fire extinguishers should
be equipped in each room for an initial fire control. In large equipment rooms, fire
extinguishing facilities should be equipped. An automatic fire alarm system should
also be equipped in the equipment room. All telecom buildings with fire alarm
system should have fire emergency lighting system and evacuation instruction
marks at important places, paths and gateways.
Anti-earthquake demand
The designed anti-earthquake intensity of the telecom equipment room must be
one degree (Richter scale) higher than that for the common buildings. The
equipment room building that cannot meet the requirement should be reinforced.
When installing router equipment, the following anti-earthquake measures should
be taken.
●
●
surge protection
Chimneys, antennas or other things that are over 15 m tall on the top of the
equipment room building should be designed according to the surge protection
requirements for civil buildings.
Measures should be taken against direct flash and intrusion of lightning current.
In the main high-rise transmission building, protective measures should be taken
to prevent side lightning strokes, especially in frequent lightning areas. Therefore
designers should take actual conditions into consideration and take appropriate
measures. For example, connect the metal external window frame to the surge
protection wire; along the height of the building, place the surge protection metal
bands at a definite spacing on the outside wall, and so on.
The main equipment-room building should be provided with the following surge
protection measures:
●
Issue 05 (2023-03-31)
voltage will occur in the core and sheath of the communication cable.
Because of the asymmetry of cores in the cables, the longitudinal voltage will
generate a horizontal noise voltage at the ends of the cores. When both ends
of the cable sheath are grounded, the sheath will function as a shield layer,
greatly reducing the longitudinal voltage and reducing the interference
voltage. Other effective methods include: reduce the voltage or current of the
interference source; reduce the line length and the spacing of the conducting
wires to reduce the area of the affected loop; directly place the insulated
conducting wires on the grounded floor; use a special grounding feedback
cable to avoid co-impedance; or twist the signal cable and the feedback cable
together to offset partial peripheral electromagnetic interference, and so on.
Use steel framework for the cabinet of the equipment. There are locking
devices to fix the boards in the cabinet.
The cabinet is reinforced with guide rail on the top and supports at the
bottom.
The building should have surge protector nets or bands installed at the
positions susceptible to lightning strokes. Lightning prevention wires or
lightning rods should be installed on the top of chimneys and antennas that
Copyright © Huawei Technologies Co., Ltd.
4 Hardware Installation and Parts Replacement
397