3Com 3C10111C - NBX 100 - Modular Exp Base, Руководство по установке

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60 C
HAPTER
2: I
NSTALLING
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YSTEM
H
ARDWARE
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OMPONENTS
Low-bandwidth Connections
You can configure a telephone to operate in lower-bandwidth
environments such as a single B channel of a BRI ISDN line or other links
with bandwidth as low as 56 Kbps.
■
The preferred method for enabling this is to select G729 audio,
forcing the device to use lower-bandwidth audio when
communicating with other system devices.
■
Alternatively, you can configure the telephone as a low-bandwidth
device when you configure the device parameters.You can reduce
bandwidth by disabling some of the NBX system’s internal status
messages and features that require multicast data traffic including
(examples: paging, conferencing, and music-on-hold).
You can also connect an NBX Telephone to the system over a broadband
connection and that is not considered a low bandwidth connection. See
the
NBX Administer’s Guide for information about connecting a remote
telephone.
Before You Begin
Installation
Before you install the NBX 100 or SuperStack 3 system hardware:
■
Complete the system plan. See the System Planning Guide on the
NBX Resource Pack CD .
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Verify that the external telephone lines are active and present at the
client’s location.
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Gather the system components at the installation location.
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Gather the required and recommended tools and equipment.
■
Verify that an existing LAN is in place and is operational and that LAN
port connections are available.
■
Read and follow the safety information and precautions later in this
chapter.
Required and
Recommended Tools
and Equipment
These tools and equipment are typically required to install an NBX system:
■
Screwdrivers (flat and Phillips)
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Pliers
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Antistatic grounding strap
■
Punch down tool