Installation Manual
Maipu Confidential & Proprietary Information
Page 12 of 21
captive screw. In the dry climate, electrostatics may be caused which is harmful for the
CMOS circuitof switch. The higher the temperature is, the more dangerous it is.It will
greatly reduce the reliability of the switch, and long-term high temperature will affect the
life span of the switch. Overhigh temperature may accelerate the aging of the insulated
materials.
Table 2-1 The temperature and humidity requirements
Temperature
Humidity
Long-term
Short-term
Long-term
Short-term
15
℃
-30
℃
0
℃
-50
℃
40%-65%
10%-90%
Note:
1. short-term means working no more than 48h less than 15 days a year;
2. The critical working environment means the possible temperature and
humidity when there is no air-conditional. It should be recovered in 5h.
2.2.2 Neatness
Dust is harmful for the operation of the switch. The dust in the room fell on the equipment
may cause the absorption of the electrostatics, which may influence the life span of the
switch and cause the communication failure. The requirement for the dust and the grin
size is as following:
Table 2-2 The requirement for the dust in switching room
The maximum diameter(um)
0.5
1
3
5
The maximum thickness (the
number of grain per m
3
)
1.4×10
7
7×10
5
2.4×10
5
1.3×10
5
Besides dust, switching room also strictly requires the content of salt, acid, and sulfide.
This harmful gas may accelerate the rusting and aging of same parts. Such harmful gas
must be prevented as SO2, H2O, NO2, NH3, and CL2. The restricted value is as
following:
Table 2-3 The limitation of harmful gas
Gas
Average(mg/m
3
)
Maximum(mg/m
3
)
SO2
0.2
1.5
