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Chapter 6
Cable CPE Commands
show controllers cable-modem tuner
To display the settings for the upstream and downstream tuners used by a router, use the show
controllers cable-modem tuner command in privileged EXEC mode.
Cisco uBR904, uBR905, uBR924, uBR925 cable access routers, Cisco CVA122 Cable Voice Adapter
Syntax Description
number
Command Modes
Privileged EXEC
Command History
Release
11.3(4)NA
12.0(4)XI1
12.1(3)XL
12.1(5)XU1
12.2(2)XA
Examples
The following example shows typical tuner settings.
and descriptions.
Router# show controllers cable-modem 0 tuner
Tuner: status=0x00
Rx: tuner_freq 507000000, symbol_rate 5360736, local_freq 11520000
Tx: tx_freq 20000000, power_level 0x3E, symbol_rate 1280000
Router#
Table 6-19 show controllers cable-modem tuner Field Descriptions
Field
tuner_freq
symbol_rate
local_freq
snr_estimate
ber_estimate
lock_threshold
QAM status
tx_freq
OL-1581-07
show controllers cable-modem number tuner
Identifies the cable interface (always 0).
Modification
This command was introduced for the Cisco uBR904 cable access router.
Support was added for the Cisco uBR924 cable access router.
Support was added for the Cisco uBR905 cable access router.
Support was added for the Cisco CVA122 Cable Voice Adapter.
Support was added for the Cisco uBR925 cable access router.
snr_estimate 17488, ber_estimate 0, lock_threshold 26000
QAM not in lock, FEC not in lock, qam_mode QAM_64
Description
Indicates the current downstream frequency.
Indicates the downstream symbol rate in symbols per second.
Frequency on which the transmitter and tuner communicate.
Signal-to-noise ratio (SNR) estimate in dB multiplied by 1000.
Bit error rate estimate (always 0).
Minimum SNR that the router will accept as a valid lock.
Indicates if QAM/FEC lock has been acquired and the modulation mode in use.
Upstream frequency sent to the router by the CMTS in the UCD message.
show controllers cable-modem tuner
Table 6-19
describes the output field possibilities
Cisco Broadband Cable Command Reference Guide
6-135
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