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3-50
Cisco Cable Modem Termination System Feature Guide
0L-1467-02
Chapter 3 Spectrum Management for the Cisco Cable Modem Termination System
Monitoring Spectrum Management
12 15.000-20.000 0 No
13 15.000-20.000 0 No
14 15.000-20.000 0 No
14 24.000-29.000 0 No
14 15.792 [1.60] Cable6/1/0 U0 0
15 15.000-20.000 0 No
16 20.000-21.600 0 No
17 30.000-33.000 0 No
17 30.000-33.200 0 No
19 30.000-34.000 0 No
19 20.000-24.000 0 No
19 10.000-14.000 0 No
20 20.000-24.000 0 No
22 20.000-30.000 0 No
22 25.936 [1.60] Cable6/1/0 U1 0
22 26.192 [1.60] Cable6/1/0 U2 0
22 26.480 [1.60] Cable6/1/0 U3 0
22 20.784 [1.60] Cable6/1/0 U4 0
22 23.984 [1.60] Cable6/1/0 U5 0
CMTS#
Step 6 To display the current CNR value for a particular cable modem, use the show cable modem cnr
command in privileged EXEC mode:
CMTS# show cable modem 10.240.179.234 cnr
MAC Address IP Address I/F MAC Prim CNR
State Sid (db)
0020.40bc.3588 10.240.179.234 C3/0/U2 online 2 38.0
CMTS# show cable modem 10.240.179.51 cnr
MAC Address IP Address I/F MAC Prim CNR
State Sid (db)
0020.40ef.4be0 10.240.179.51 C3/0/U5 online 11 39.5
CMTS#
Monitoring Spectrum Management
You can use Cisco IOS CLI commands to monitor spectrum management activity on the Cisco CMTS.
If you are using Cisco IOS Release 12.2(8)BC2 or later 12.2 BC releases, and the Cisco uBR-MC16S
cable interface line card, you can also use SNMP to monitor the spectrum management activity. See the
following sections for more information:
• Using CLI Commands, page 3-51
• Using SNMP, page 3-51
• Using the DOCSIS Cable Modem Test Analyzer, page 3-55
- Modem Termination System 1
- Upstream Frequency Changes 3
- Frequency Management Policy 5
- Phases of Spectrum Management 6
- Traffic Shaping 8
- Upstream Traffic Shaping 9
- Downstream Traffic Shaping 10
- Guided Frequency Hopping 11
- 0L-1467-02 12
- Feature Overview 12
- Input Power Levels 13
- Benefits 16
- Restrictions and Limitations 19
- Cisco uBR-MC16S Line Card 20
- Prerequisites 21
- Related Documents 22
- Spectrum Management Documents 23
- Supported Platforms 24
- Configuration Tasks 25
- Creating Spectrum Groups 28
- Adding an Upstream Frequency 29
- Adding a Spectrum Band 30
- Setting Input Power Level 34
- Verifying Frequency Hopping 35
- Configuring Spectrum Groups 37
- • Using SNMP, page 3-51 50
- Using CLI Commands 51
- Using SNMP 51
- Configuration Examples 56
- Enabling Shaping Example 58
- Combiner Group Example 62
- Verifying Your Settings 64
- Modulation Profiles Example 65
- Input Power Level Examples 66
- Upstream Modulation feature) 67
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