IBM 8237, Инструкция по установке и эксплуатации

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Chapter 1 Introduction and Planning
1-15
Operating Environment
This section specifies the physical environment required by 8237s.
Space Requirements
If you will connect multiple 8237s in a stack, be sure that you have enough space
available in your rack or shelf for the number of hubs that will be stacked together.
Allow at least 76 mm (3 in.) at the back and 50 mm (2 in.) at the sides of the 8237 to
ensure proper cooling. Leave 200 mm (8 in.) in front for viewing the LEDs, installing
Expansion Ports, connecting cables, and for air circulation.
Environmental Requirements
Power-on temperature 10
°
to 40
°
C
(50
°
to 104
°
F)
Relative humidity 85% maximum
Storage temperature -25
°
to 70
°
C
(-13
°
to 158
°
F)
Acoustic Characteristics
Table 1-2 is a declaration of the 8237’s noise emission characteristics.
Table 1-2. Noise Emission Characteristics of the 8237
L
WAd
L
pAm
<L
pA
>
m
Type Description Operating
(bels)
Idling
(bels)
Operating
(dB)
Idling
(dB)
Operating
(dB)
Idling
(dB)
8237
Stackable
Ethernet
Hub
5.1 5.1 N/A N/A 37 37
Notes:
L
WAd
is the declared sound power emission level for a production series of machines.
L
pAm
is the mean value of the sound pressure emission levels at the operator position (if any) for a production
series of machines.
<L
pA
>
m
is the mean value of the space-averaged sound pressure emission levels at the one-meter position for a
production series of machines.
N/A
not applicable (no operator position).
All measurements were made in accordance with ISO 7779 and reported in conformance with ISO 9296. These are
preliminary values and are subject to change. The final values will be available from IBM Manufacturing for production
machines.