Cisco uBR904 Manuale di istruzioni
CHAPTER
Installing the Cisco uBR904 Cable Modem 3-1
3
Installing the Cisco uBR904
Cable Modem
This chapter explains the procedures for installing and starting the Cisco uBR904 cable
modem. The chapter contains the following sections:
•Connecting the CATV Coaxial Cable
•Connecting Ethernet Cables to the Cisco uBR904 Cable Modem
•Connecting the Cisco uBR904 Cable Modem to the Computer
•Connecting Console Cables
•Connecting Power
•Starting the Cisco uBR904 Cable Modem
The most common installation location for a Cisco uBR904 cable modem is on a desktop
next to a personal computer. You can also install a Cisco uBR904 cable modem on a shelf
in an equipment rack, for example, if you are installing a Cisco uBR904 cable modem at a
headend site for test purposes.
Connecting the CATV Coaxial Cable
Cisco uBR904 Cable Modem Installation and Configuration Guide
3-2
Connecting the CATV Coaxial Cable
Follow these steps to connect the CATV coaxial cable to the Cisco uBR904 cable modem:
Step 1 Locate the coaxial cable at the installation site and move the cable end, or install
a two-way splitter as necessary, to provide a connection near the Cisco uBR904
cable modem location.
Note If the quality or general condition of the coaxial cable at the installation
site is in question, we recommend that you replace the coaxial cable. For more
information on the effects of substandard cabling on the Cisco uBR904 cable
modem installation, see the section “Wiring and Cabling” in the chapter
“Preparing for Installation.”
Step 2 Connect the CATV coaxial cable end to the F connector on the back of the
Cisco uBR904 cable modem. This connector is labeled “Cable TV In.”
(See Figure 3-1.)
Figure 3-1 Connecting the CATV Coaxial Cable to the Cisco uBR904 Cable
Modem
This completes the procedure for connecting the CATV coaxial cable to the Cisco uBR904
cable modem.
To cable source
11616
F connector (Cable TV In)
Installing the Cisco uBR904 Cable Modem 3-3
Connecting Ethernet Cables to the Cisco uBR904 Cable Modem
Connecting Ethernet Cables to the Cisco uBR904 Cable
Modem Follow these steps to connect the Ethernet cables to the Cisco uBR904 cable modem at the
installation site:
Step 1 Locate the straight-through yellow Ethernet cable that was included with your
Cisco uBR904 cable modem. Note that only one cable is included. For
additional cables, see your commercial vendor. (See Figure 3-2.)
Note If you are connecting the Cisco uBR904 cable modem directly to a single
computer, use the straight-through Ethernet cable that was included with the
Cisco uBR904 cable modem.
If you are connecting the Cisco uBR904 cable modem to a hub for multiple
computer connections, you must use a crossover Ethernet cable. A crossover
Ethernet cable is not provided with the Cisco uBR904 cable modem; however,
Ethernet cables are widely available from other commercial vendors. For details
on making a crossover connection, see the section, “Making a Crossover
Ethernet Cable Connection” in the chapter, “Preparing for Installation,” for
details. If your hub has an uplink port, you might be able to use a
straight-through cable to connect the hub directly to your computer.
Figure 3-2 Ethernet Cable and RJ-45 Connectors
H2936
87654321
R
J-45 connector
Connecting Ethernet Cables to the Cisco uBR904 Cable Modem
Cisco uBR904 Cable Modem Installation and Configuration Guide
3-4
Step 2 Connect one end of the Ethernet cable to one of the Ethernet ports (labeled 1X,
2X, 3X, or 4X) on the rear panel of the Cisco uBR904 cable modem. Press the
cable end firmly into the receptacle. When properly connected, the Ethernet
cable will be locked into the receptacle and can only be removed by pressing the
plastic tab located on the connector while pulling the cable back from the
receptacle. (See Figure 3-3.)
Figure 3-3 Connecting the Ethernet Cable to the Cisco uBR904 Cable Modem
Step 3 Repeat Step 2 for other Ethernet connections.
This completes the procedure for connecting Ethernet cables to the Cisco uBR904 cable
modem.
11617
T
o cable
source
Ethernet 10BaseT
(RJ-45)
To computer
Ethernet cable
Installing the Cisco uBR904 Cable Modem 3-5
Connecting the Cisco uBR904 Cable Modem to the Computer
Connecting the Cisco uBR904 Cable Modem to the
Computer
Follow these steps to connect the Cisco uBR904 cable modem to the computer at the
installation site:
Step 1 Locate the unconnected end of the yellow Ethernet cable that you just connected
to the Cisco uBR904 cable modem in the previous section, “Connecting
Ethernet Cables to the Cisco uBR904 Cable Modem,” and connect this end to
the Ethernet port on the personal computer. (See Figure 3-4.)
Note The Ethernet port is located on the back of the computer if an internal
Ethernet card is installed. On a laptop computer, the Ethernet port is usually
located on an adapter cable connected to a PCMCIA card installed in the
computer’s PCMCIA slot.
If you need additional information to locate the Ethernet port on the computer,
consult the user documentation for the computer.
Figure 3-4 Connecting the Cisco uBR904 Cable Modem to the Computer
Step 2 Repeat Step 1 for other cable modem and personal computer connections.
This completes the procedure for connecting the Cisco uBR904 cable modem to a
computer.
To cable
source
PC
10BaseT
11618
Connecting Console Cables
Cisco uBR904 Cable Modem Installation and Configuration Guide
3-6
Connecting Console Cables
The console port for the Cisco uBR904 cable modem is located on the back of the unit. This
section contains connection equipment and pinout information for the console port on the
Cisco uBR904 cable modem.
Note The console port is provided on the Cisco uBR904 cable modem to aid in
troubleshooting. Most troubleshooting can be completed without using the console port.
We recommend that you only use the console port if all other troubleshooting steps fail to
pinpoint a failure.
If you do not plan to use the console port, proceed to the section “Connecting Power,” later
in this chapter.
Console Port Connection Equipment
The console port is configured as data communications equipment (DCE). There is one
console port on the back of the Cisco uBR904 cable modem; it uses an RJ-45 connector.
RJ-45-to-DB-25 adapters are available for connection to modems and other external
communications equipment.
Note The console port is an asynchronous serial port; any devices connected to this port
must be capable of asynchronous transmission. (Asynchronous is the most common type
of serial device.)
Before connecting a hand-held terminal to the console port, configure the terminal to match
the Cisco uBR904 cable modem console port as follows: 9600 baud, 8 data bits, no parity,
2 stop bits (9600 8N2). You need an RJ-45 console cable to connect the terminal to the
console port. After you establish normal Cisco uBR904 cable modem operation, you can
disconnect the terminal.
Installing the Cisco uBR904 Cable Modem 3-7
Connecting Power
Console Port Signals
The Data Set Ready (DSR) signal is active when the system is running. The console port
does not support modem control or hardware flow control. Table 3-1 lists the signals used
on the console port. The console port requires an RJ-45 cable.
Table 3-1 Console Port Signals
This completes the information necessary for connecting the console cables.
Connecting Power
Use the following procedures (see also Appendix Figure 3-5) to connect AC-input power
to the Cisco uBR904 cable modem.
Step 1 At the rear of the Cisco uBR904 cable modem, locate the power receptacle.
Step 2 Insert the cable from the power supply into the power receptacle.
Step 3 Plug one end of the power cord into the power supply.
Step 4 Plug the other end of the power supply into an AC power source.
This completes the procedure for connecting AC-input power.
Pin Signal Direction Description
1– – –
2 DTR —> Data Terminal Ready
3TxD —> Transmit
4GND – –
5GND – –
6 RxD <— Receive
7 DSR <— Data Set Ready (always on)
8– – –
Starting the Cisco uBR904 Cable Modem
Cisco uBR904 Cable Modem Installation and Configuration Guide
3-8
Note The cable modem has power when you connect it to the power outlet. It is meant to
be left on at all times, therefore it has no power switch. To turn the cable modem off, unplug
the power cord.
Figure 3-5 Connecting the Power Cord
Starting the Cisco uBR904 Cable Modem
After installing the Cisco uBR904 cable modem and connecting the cables, start the
Cisco uBR904 cable modem as follows:
Step 1 Connect the power supply to the cable modem. See the earlier section
“Connecting Power” for details.
Step 2 Watch the LEDs (lights) on the front of the cable modem. The OK (power) LED
on the front of the unit blinks for up to one minute. When the
Cisco uBR904 cable modem boot is complete (a few minutes), the OK LED
stays on and the ACT (cable) LED goes on.
PC
11619
To cable
source
Power
supply
Installing the Cisco uBR904 Cable Modem 3-9
Starting the Cisco uBR904 Cable Modem
Step 3 Configure the Cisco uBR904 cable modem. When you start up the
Cisco uBR904 cable modem, a connection should be established to the
Cisco uBR7246 universal broadband router installed at the cable headend. The
Cisco uBR904 cable modem will be automatically configured by the universal
broadband router.
Note If the Cisco uBR904 cable modem does not complete each of the steps in the startup
procedure, proceed to the chapter “Troubleshooting the Installation,” for troubleshooting
recommendations and procedures.
If the Cisco uBR904 cable modem completes each of the steps in the startup procedure,
proceed to the section “Verifying the Installation” to verify that the connection to the
network is working properly.
This completes the installation of the Cisco uBR904 cable modem.
Starting the Cisco uBR904 Cable Modem
Cisco uBR904 Cable Modem Installation and Configuration Guide
3-10
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