Specifications

DOCSIS 1.1 for Cisco uBR905 and Cisco uBR925 Cable Access Routers and Cisco CVA122 Cable Voice Adapters
Command Reference
58
Cisco IOS Release 12.2(15)CZ
Note The show controllers cable-modem 0 all command displays extensive information about the current
state of the modem and its MAC-layer and PHY-layer registers and buffers. You need to open a capture
buffer on your terminal or Telnet software to log this information before you give this command.
Table 2 describes the significant fields shown by the show controllers cable-modem command. For
more information, see the Broadcom documentation for the BCM3300 chip.
Table 2 show controllers cable-modem Field Descriptions
Field Description
BCM3300 unit Unit number of this BCM3300 chip.
idb Interface description block number.
ds Downstream channel.
regaddr Indicates the start of the BCM3300 registers.
reset_mask Indicates the bit to hit when resetting the chip.
station address MAC address of this router’s cable interface.
default station address Default MAC address assigned by the factory for this router.
PLD VERSION PLD version of the BCM3300 chip.
MAC State Current MAC state of the router.
Prev States Number of states that have previously existed since initialization.
MAC mcfilter MAC control filter for MAC messages.
data mcfilter MAC control filter for data.
DS Downstream Broadcom receiver chip number and ID.
US Upstream Broadcom transmitter chip number and ID.
Tuner: status Current status of the tuner.
Rx: tuner_freq Downstream frequency (in Hz) that the router searched for and found.
symbol_rate Downstream frequency in symbols per second.
local_freq Frequency on which the transmitter and the tuner communicate.
snr_estimate Estimate of signal-to-noise ratio (SNR) in dB multiplied by 1000.
ber_estimate Estimate of bit error rate (always 0).
lock_threshold Minimum signal-to-noise ratio (SNR) that the router will accept as a valid
lock.
qam_mode The modulation scheme used in the downstream direction.
Tx: tx_freq Upstream frequency sent to the router by the CMTS in the UCD message.
power_level Transmit power level as set in the hardware, expressed as a hexadecimal
value. The units are unique to the hardware used. Use the show controllers
cable-modem mac state command to see the power level in dBmV.
symbol_rate Upstream frequency in symbols per second.
TFTP server IP address of the TFTP server at the CMTS.
TOD server IP address of the time-of-day server at the CMTS.
Security server IP address of the security server at the CMTS.