2-15
Cisco uBR10012 Universal Broadband Router Software Configuration Guide
OL-1520-05
Chapter2 Configuring the Cable Modem Termination System for the First Time Configuring the Cable Interface with the Extended Setup Facility
The MAC addresses are assigned to the slots in sequence. This address scheme allows you to remove
line cards and insert them into other CiscouBR10012router without causing the MAC addresses to
move around the network or be assigned to multiple devices.
Storing the MAC addresses for every slot in one central location means that the addresses stay with the
memory device on which they are stored.
Identifying the Cable Interface Line Card

Identifying CM Line Cards

The following Cisco cableinterfaces can be installed in a CiscoCMTS:
•The CiscouBR10012router supports one downstream modulator and one upstream demodulator.
–
The CiscouBR10012router supports the following defaults: QAM-256 at 40 MBps
downstream, and QAM-16 at 5Mbps upstream.
–
The card supports upstream channel widths of 200kHz, 400kHz, 800kHz, 1.6MHz, and
3.2MHz.
–
The card outputs +42dBmV and +/- 2dBmV.
–
The downstream modulator has both an RF output, using the integrated upconverter, and an
intermediate frequency (IF) output, which must be connected to an external upconverter.

Identifying CM Line Card Slots

On the CiscouBR10012router, the cable interface line card is fixed and is always slot 1. To display
information about a specific cableinterface slot’s downstream channel, use the showinterfaces cable
command with the CM card’s slot number and downstream port number in the following format:
show interfaces cable slot/downstream-port [downstream]
Use the slot number and downstream port number to display information about a downstream interface.
You can abbreviate the command to shintc. The following example shows the display for upstream
channel port 0 on a CiscouBR10012router:
Router# sh int c 5/0/0
To display information about a specific cableinterface slot’s upstream channel, use the
showinterfaces cable command. Include these CM card parameters:
•Slot number
•Downstream port number
•Upstream port number
Use this format:
show interfaces cable slot/downstream-port [upstream] upstream-port
Use the slot number, downstream port number, and upstream port number to display information about
an upstream interface. You can abbreviate the command to shintc.
The following example shows the display for upstream channel port 0 in cableinterface slot3 of a
CiscouBR10012router that is turned up:
Router# sh int c3/0/0 upstream