n The equipment room should be kept 3.7 km away from the seaside or salt lake. If this requirement cannot be satisfied, the equipment room should be airtight with cooling facilities. In addition, the alkalized soil cannot be used as the construction material. Otherwise, the equipment applicable in atrocious environment must be adopted.
n The old livestock room or the chemical fertilizer warehouse cannot be used as the equipment room.
n The equipment room should be solid enough to withstand wind and downpour.
n The equipment room should be kept away from the road or sand field with dusts flying around. If this requirement cannot be satisfied, the windows and doors of the equipment room should be kept away from the sources of pollution
A.1 Layout of Equipment Room
The communication equipment room houses a complete set of communication transmission equipment, SPC switching equipment, power supply, and so on. They should be arranged compactly for ease of maintenance and management. Figure A-1 shows a typical layout of the equipment room.
Figure A-1 Layout of the equipment room
Principles for layout of the equipment room are as follows:
n Meet the requirements for wiring and maintaining the communication cable and power cable.
n Avoid line roundabout for convenient maintenance, thus lowering the cable cost, reducing communication failures and improving the work efficiency.
n Install the transmission equipment in a separate room close to the MDF room, or near the switch.
A.2 Construction of the Equipment Room
The construction of the equipment room shall meet the requirements listed in Table A-1.
Table A-1 Construction requirements for the equipment room
|
Item |
Requirements |
|
Area |
The equipment room should be able to house all the devices of the terminal office at least. |
|
Net height |
Minimum indoor height refers to the net height under the roof beam or under the ventilation pipe. Normally it is no less than 3m. |
|
Indoor floor |
The floor of the equipment room should be semi-conductive and not dust-arousing. Generally, ESD-preventive raised floor is required. The floor boards should be laid tightly and firmly. For each square meter of floor space, the horizontal tolerance should not be greater than 2mm. If no raised floor is available, electrostatic conductive floor material (with a volume resistivity ranging 1.0 x 107 Ω – 1.0 x 1010 Ω) should be laid. The electrostatic conductive floor material or the ESD-preventive raised floor should be grounded well. It can be connected to the grounding device through a current limiting resistor and a connection wire. Resistance of the current limiting resistor should be 1 MΩ. |
|
Load-bearing capacity of floor |
> 450 kg/m2 |
|
Doors and windows |
Doors are single-leaf, 2 m high and 1 m wide. All doors and windows should be sealed with dust-proof rubber strips. Double-layer glass is recommended for windows. |
|
Wall |
The wall can be covered with wallpaper or lusterless paint, but not the paint that is apt to get pulverized or peeled. |
|
Indoor ducts |
Indoor ducts are used for cabling. The inside of the ducts should be smooth and clean. The reserved length and width (margins) as well as the number, position and size of the holes should comply with the relevant requirements for placing the optical synchronous transmission equipment. |
|
Water supply and drainage |
The service pipes, drain pipes and rain pipes should not pass through the equipment room. Fire hydrants should not be placed in the equipment room, but in corridors or the place near the staircase where they can be easily seen and accessed to. |
|
Internal partition wall |
The place where the equipment is installed is separated from the equipment room door. The partition wall can hold back some dusts, as be shown in Figure A-2. |
|
Installation position of the air conditioner |
The air conditioner should be installed in the place where the discharged air from the air conditioner shall not be directed to the equipment. |
|
Other requirements |
In addition to the rodent-proof measures (for example, measures against mice), measures against proliferation of fungi and mildew should be taken in the equipment room. |
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