3Com CMX 3CR292-DE56 User manual

3Com U.S. RoboticsCable Modem CMX
Quick Installation Guide
What You Need to Install Your Cable Modem CMX
IInncclluuddeedd::
•Cable modem
•Cable modem power supply
•RJ-45 network cable
•Rubber feet and stacking clips kit
•Cable ConnectionsCD-ROM
•This Quick Installation Guide
•User’s Guide & Reference
PN 1.024.1970-00
Copyright 3Com Corporation. All rights reserved. 3Com and U.S. Robotics
are registered trademarks and Connections is a trademark of 3Com
Corporation. Windows is a registered trademark of Microsoft Corp.
Macintosh is a registered trademark of Apple Computer, Inc. Any other
trademarks, trade names, or service marks used in this manual are the
property of their respective owners.
NNoott IInncclluuddeedd::
•A PC running Windows95 (or later) or a Macintosh
running System 7.5 (or later) with TCP/IP protocol
installed (see the “Before You Begin” section in the
included User’s Guide & Reference for more information
about installing TCP/IP)
•An active two-way cable line
•An active Ethernet port or network interface card (NIC)
installed in your computer
•A 7/16 inch (or adjustable) wrench for securing the cable
line to the modem
•A screwdriver, pushpins, and screws (for optional wall-
mounting). The screw heads should be at least 0.2” (5mm)
in diameter for them to be properly captured in the slot. If
you are using wood screws, use #6 pan heads or
equivalent.

Hardware Installation
1. Contact your local cable company. They can help you establish a cable Internet access account and install a cable access outlet
in the room where your computer is located.
2. Prepare your workspace. If you are planning to wall-mount your cable modem, see page 11 in the User’s Guide & Reference or
the perforated card that is part of this Installation Guide. Otherwise, prepare to use your cable modem by performing the following
steps:
•Position your computer near your cable outlet.
•If you plan to install the modem on your desktop, attach the rubber feet to the bottom of the modem (see page 13 in the
User’s Guide & Reference for details).
•If you plan to wall-mount the modem, you will need the mounting template included as the last page of this guide (see
page 11 in the User’s Guide & Reference for more information)
•If you plan to stack the modem on top of 3Com OfficeConnectproducts, you will need the stacking clips included with
your modem (see page 13 in the User’s Guide & Reference for more information)
•Place the modem where it will be near your computer and the cable outlet, leaving plenty of room to guide the cables away
from the modem without crimping the cables.
•The modem should have access to constant airflow.
•Do not stack anything on top of the modem (see page 13 in the User’s Guide & Reference for information on stacking the
cable modem on top of 3Com OfficeConnect products).
•The temperature where the cable modem will be located should be within 0 and 40°C (32 and 104°F). Relative humidity
should be between 5 and 95%, non-condensing.
3. Verify your computer is set up for networking. Windows users should install the TCP/IP protocol and Mac users should verify
that networking support is installed. The cable modem requires your computer to have an RJ-45 Ethernet interface and TCP/IP
installed. See the “Before Your Begin” section in the User’s Guide & Reference for more information.

4. Connect your cable modem to your computer and the cable line. Use the diagrams below as a guide. See the section titled
“Cable Modem Hardware Installation” in the User’s Guide & Reference for detailed instructions.
5. Power up the cable modem. Plug the cable modem power supply into a wall outlet. After your cable modem completes start up
and initialization (both the Cable modem Power and Cable modem Status LEDs are lighted solid green), power up your computer,
launch your Web browser and experience the Internet at blazing speeds using your new U.S. Robotics Cable Modem CMX!
CATV
SERIAL 10 BT
cable line (to cable
outlet) RJ-45 Cable
power supply
(to wall outlet)
RJ-45 cable
(to NIC)
13 212
311
410
59
68 7
15 2585
3080
4575
5070
5565 60
RJ-45 cable
(to NIC)
cable outlet
Cable
Modem PC Link Cable
Status
Power Status Activity Activity FCN
power supply cable
(to wall outlet)
3ComU.S. Robotics
CableModem
CMX
Installing the Cable Connections CD-ROM
Although you do not need to install the included Cable Connections CD-ROM to use your Cable Modem CMX, you will want to
discover the valuable free software products and Internet service provider offers included on the CD-ROM. To install Cable
Connections, follow the instructions inside the CD’s jacket or on the CD-ROM itself.

Cable Modem Operation
Once your cable modem is properly installed and power supply is connected to AC power, it should automatically scan for the active
cable modem channel from your cable company’s server. Once the front panel LEDs indicate the modem is connected to the server, all
you need to do is launch your Internet or e-mail software and you’re ready to work online. Here’s a quick overview of the LED lights
on the front panel of your modem and what they can tell you about the performance of your modem and the condition of your
connection.
Cable
Modem PC Link Cable
Status
Power Status Activity Activity FCN
123456
1. Cable Modem Power - Indicates power is applied to the cable modem. This light is solid green when the modem is on.
2. Cable Modem Status - When this LED is solid green, the modem has completed initial communications with the cable company
server and is functional. If it is blinking, the modem is still starting up. If this LED never stops blinking, you may be using the
wrong power supply or the modem may require service.
3. PC Link Status - Indicates that the cable modem is connected to the Ethernet card in your computer. This light is solid green when
this link is established.
4. PC Link Activity - Indicates that data is being transmitted to or from your PC over the Ethernet port. Flashing orange indicates
traffic. This LED should blink when data is being transmitted or received over the Ethernet port.
5. Cable Activity - Indicates that data is being transmitted to or from your cable company over the RF (cable) port. Flashing orange
indicates traffic.
6. FCN - Individual cable operators determine the function of this LED.

INSTRUCTIONS FORWALL-MOUNTINGTHE CABLE MODEM
Wall-mounting Template
See other side for basic instructions.
For complete instructions, see the
User's Guide & Reference .

INSTRUCTIONS FORWALL-MOUNTINGTHE CABLE MODEM
1Remove this template from
this
Installation Guide .
4Secure the screws in the starter
holes, leaving at least 1/4" (6mm)
clearance.
3Insert pushpins into the
cross hairs on the template.
2Place the template at least 20" (50 cm)
above and parallel to the floor.
INSTRUCTIONS FORWALL-MOUNTING THE CABLE MODEM
Wall-mountingTemplate
Seeother side for basic instructions.
Forcomplete instructions, see the
User'sGuide & Reference
.
INSTRUCTIONS FORWALL-MOUNTING THE CABLE MODEM
Wall-mountingTemplate
Seeother side for basic instructions.
Forcomplete instructions, see the
User'sGuide & Reference
,
20"
[50 cm]
INSTRUCTIONS FOR WALL-MOUNTING THE CABLE MODEM
Wall-mounting Template
See other side for basic instructions.
For complete instructions, see the
User's Guide & Reference
.
1/4"
[6 mm]
Starter hole
Screw
5Attach the cables.
CATV
SERIAL 10 BT
power supply
(to wall outlet)
cable line (to cable
outlet)
RJ-45 cable
(to NIC)
6Fit the mounting holes over the screw heads
and slide the unit down until it locks in place.
Screws
®
®