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Practical Exercise: The CMTS and DOCSIS-Compliant Bridging Cable Modem Configuration
The practical exercise is designed to test your knowledge of the topics covered in this chapter. The practical exercise begins by giving you some information about a situation and then asks you to work through the solution on your own. The solution is found at the end.
Figure 4-6 presents the network topology for this Practical Exercise.
Figure 4-6. Practical Exercise: Cable Modem Lab Topology
Before you begin this exercise, be sure the DHCP, ToD, and TFTP servers are properly configured and that the DOCSIS configuration file is available on the TFTP server for Cisco cable access router to download.
In this exercise, you need to configure the CMTS - Cisco uBR7246 shown in Figure 4-6 as follows:
Activate upstream port 0 of the cable modem card in slot 3.
Configure spectrum management using group number 30. Configure three upstream frequencies29 MHz, 33 MHz, and 39 MHzand then associate this group with upstream port 0.
Set the power level of upstream port 0 to 0.
Configure the cable helper address using IP address 172.16.1.2.
Change the upstream channel bandwidth to 3200000.
Change the downstream modulation mode to 256-QAM.
If everything is configured correctly in this exercise, the PC in the figure will be able to obtain an IP address from the DHCP server and will have network connectivity.
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