3Com V3000 ANALOG, Руководство по установке

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International Feature Support 83
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Verify that the installation site has sufficient cooling and air circulation
to maintain ambient temperatures from 0 °C through 40 °C (32 °F
through 104 °F
)
and a humidity range of 5% to 85%, noncondensing.
Physical
Requirements
When you install an NBX system, verify that the installation site meets
these physical requirements:
■
The NBX system should be installed in a secure area. Telephone service
and voice messaging are crucial business services. Protect them from
tampering or accidental interference.
■
To rack-mount an NBX system, use a standard 486-mm (19-in.)
equipment rack, properly installed and grounded according to the
manufacturer’s instructions.
■
Allow at least 8 cm (3 in.) of space on either side of the NBX chassis
for proper ventilation.
Local Telephone
Service
Before you install the NBX system, be sure that the installation site meets
the following local telephone service requirements:
■
The local telephone company has installed local telephone lines and
assigned telephone numbers.
■
If necessary, you have extended the wires from a centrally located
telephone interface panel to the installation site.
■
Each analog telephone line has dial tone.
CAUTION: 3Com strongly recommends that you use UL-listed surge
suppression devices on all local telephone lines.
■
If you are installing an optional BRI-ST, T1, or E1 Digital Line Card,
verify that the telephone company has installed BRI-ST, T1, or E1 lines
and run them to the installation location.
International
Feature Support
For international users, the following features and devices warrant special
attention.
Power Fail Transfer For the Power Fail Transfer (PFT) feature, is available only in North
America.
CAUTION: You should have access to a mobile or analog telephone that
is connected to your standard PSTN.