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Chapter 3
Cisco CMTS Show Commands
Command History
Release
12.1(7)CX1
12.2(8)BC2
Usage Guidelines
Cisco IOS Release 12.3(9a)BC adds the tech-support keyword to the show controllers cable command.
This change allows users with large numbers of online cable modems to collect the necessary line card
information without consuming the console session for a long period of time.
Additional and related improvements are also available for the show cable tech-support command.
For all supported releases, the show controllers cable upstream spectrum command displays the
power in dBmV for a given frequency range for the specified upstream. The frequency range can cover
any portion of the DOCSIS upstream frequency range (5 to 42 MHz), and the frequency range can be
divided into a resolution as small as 12 KHz.
If a CM is specified by its IP address or MAC address, the power information for that particular CM is
given. If no IP or MAC address is given, the command displays the background noise for the entire
upstream. All displays use historical averaging of data collected at the time the command is used;
historical information is not saved.
Note
Cisco cable interface line cards always program the upstream's center frequency in 16-KHz increments,
and this is the frequency displayed by the show controller cable upstream command. For example, if
you use the
upstream x frequency 27000000), the actual center frequency will be 27.008 MHz, which is the next-
highest 16-KHz boundary.
By default, the show controller cable upstream command displays its output to the router's console
Tip
port. To display the command's output when logged in during a Telnet session over an Ethernet port, use
the terminal monitor command before giving the show controller cable upstream command.
Examples
The following example shows the show controllers cable upstream command displaying the power
information for a particular CM on upstream 5 of cable interface slot 3/0. The power information is
displayed over the entire upstream (5–42 MHz), with a resolution of 5 MHz:
Router# show cable modem
MAC Address
...
00d0.ba77.7595 10.20.114.34
00d0.ba77.7621 10.20.114.17
00d0.ba77.7533 10.20.114.55
...
Router# show controllers cable 3/0 upstream 5 spectrum 10.20.114.34 5 42 5
02:16:49: Spectrum DATA(@0x4B060004) for u5: 4995-41991KHz(resolution 4992KHz, sid 1):
02:16:49: Freq(KHz) dBmV Chart
02:16:49: 4995 :
OL-1581-08
Modification
This command was introduced for Cisco CMTS routers using the
Cisco uBR-MC16S cable interface line card.
Support was added for the Cisco uBR10012 router and the
Cisco uBR-LCP2-MC16S cable interface line card.
cable upstream frequency
IP Address
I/F
C3/0/U5 online
C3/0/U5 online
C3/0/U5 online
-5
*************************
show controllers cable upstream spectrum
command to specify a center frequency of 27 MHz (cable
MAC
Prim
RxPwr Timing Num
State
Sid
(db)
1
0.25
2
0.25
3
0.25
Cisco Broadband Cable Command Reference Guide
BPI
Offset CPEs Enbld
2740
1
yes
2740
2
yes
2740
1
yes
3-177
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