Product Overview
1-7
Functional Overview
Functional Overview
This section provides a functional overview of the Cisco uBR904 cable modem. It describes
the cable modem Media Access Control (MAC) address, connection, and configuration.
These descriptions will help you become familiar with the functions of the Cisco uBR904
cable modem.
MAC-Layer Address
All local-area network (LAN) devices, such as cable modems, require unique MAC-layer
addresses, also known as
hardware
addresses. The MAC address of a Cisco uBR904 cable
modem is stored in the unit. You should record the MAC address on the site installation
sheet provided in the chapter, “Preparing for Installation.”
Cisco uBR904 Cable Modem Cable Connections
The Cisco uBR904 cable modem is connected to CATV coaxial cable and to an Ethernet
port on a personal computer. The personal computer must have an Ethernet network card
installed; either an internal card installed in the computer chassis, or a PCMCIA adapter
card and cable installed on a laptop computer.
The coaxial cable connection uses standard connectors at both ends of the coaxial cable,
and an F-connector on the back of the cable modem. The F-connector is labeled
“Cable TV In.” The Ethernet connections use straight-through Ethernet cables with RJ-45
connectors at both ends, and RJ-45 receptacles on the back of the cable modem. The
RJ-45 connectors are labeled 1X, 2X, 3X, and 4X.
Note
One straight-through Ethernet cable with RJ-45 connectors has been included with
your Cisco uBR904 cable modem. Additional RJ-45 cables are also available from outside
commercial cable vendors.
