Cisco UBR904 Troubleshooting Guide - Page 47

show controllers cable-modem tuner show controllers cable-modem tuner To display the settings for the upstream and downstream tuners used by a Cisco uBR904 cable modem, use the show controllers cable-modem tuner command in privileged EXEC mode. show controllers cable-modem tuner Syntax Description There are no key words or arguments for this command. Command Mode Privileged EXEC Usage Guidelines This command first appeared in Cisco IOS Release 11.3 NA. Examples The cable modem's tuner settings are displayed in the following example. See Table 9 for output field possibilities and descriptions. uBR904# show controllers cable-modem 0 tuner Tuner: status=0x00 Rx: tuner_freq 507000000, symbol_rate 5360736, local_freq 11520000 snr_estimate 17488, ber_estimate 0, lock_threshold 26000 QAM not in lock, FEC not in lock, qam_mode QAM_64 Tx: tx_freq 20000000, power_level 0x3E, symbol_rate 1280000 Table 9 describes the fields shown in the display Table 9 Show Controllers Cable-Modem Tuner Field Descriptions Field tuner_freq symbol_rate local_freq snr_estimate ber_estimate lock_threshold QAM status tx_freq power_level Description Indicates the current downstream frequency. Indicates the downstream or upstream symbol rate in use. Frequency on which the transmitter and tuner communicate. Signal to noise estimate in dB X 1000. Bit error rate estimate (always 0). Minimum signal-to-noise ratio (SNR) that the uBR904 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 uBR904 by the CMTS in the UCD message. Transmit power level as set in the hardware, given as a hexadecimal value. The units are unique to the hardware used. Use the show controllers cable-modem 0 mac state command to see the power level in dBmV. Troubleshooting Tips for the Cisco uBR904 Cable Modem 47