Configuring Headend Broadband Access Router Features
Configuring and Activating Frequency Agility
To adjust the frequency hop threshold percentage or the minimum period between frequency hops, use the following commands in global configuration mode:
| Command | Purpose |
Step 1 |
|
|
CMTS01(config)# cable | Sets the percentage of all cable modems losing | |
| threshold percent | keepalive messages (going offline) that will cause a |
|
| frequency hop. |
Step 2 |
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|
CMTS01(config)# cable | Sets the minimum time between frequency hops in | |
| period seconds | seconds. Valid values are from 1 to 3600 seconds. |
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The current implementation is known as blind frequency hop because there is no
To specify that a particular spectrum group is a shared RF spectrum group, use the following command in global configuration mode:
Command | Purpose |
|
|
CMTS01(config)# cable | Specifies a given spectrum group as “shared” and tells the |
| Cisco uBR7200 series that you want to be sure that upstream |
| frequencies assigned to upstream interfaces are not assigned |
| to additional upstream interfaces. |
|
|
Verifying Spectrum Group Characteristics
To verify spectrum group characteristics and whether or not a spectrum group is shared, enter the show cable
CMTS01# show cable |
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22:07:46: |
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| ||||
Group | Frequency | Upstream | Weekly Scheduled | Power | Shared | |
No. | Band | Port | Availability |
| Level | Spectrum |
| (Mhz) |
| From Time: | To Time: | (dBmV) |
|
1 |
|
|
| 0 | Yes | |
1 | 12.000 |
|
|
| 0 | Yes |
1 | 22.000 |
|
|
| 7 | Yes |
2 | 29.000 |
|
|
| 6 | No |
2 | 26.000 |
|
|
| 0 | No |
3 |
|
|
| 0 | No | |
3 |
|
|
| 5 | No | |
5* |
| Thu 21:50:00 | Thu 21:45:00 | 0 | Yes | |
Troubleshooting Tips
To troubleshoot the configuration, perform the following tasks:
•Make sure you entered a valid spectrum group number and type.
•Make sure you are in global cable configuration mode.
Cisco IOS Multiservice Applications Configuration Guide
