Cisco Systems UBR900 specifications Cisco IOS Release 12.07T

show controllers cable-modem

Table 6	show controllers cable-modem Field Descriptions (continued)
Field		Description
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 Cisco uBR900 series 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 X 1000.
ber_estimate		Estimate of bit error rate (always 0).
lock_threshold		Minimum signal-to-noise ratio (SNR) that the Cisco uBR900 series will accept as a
		valid lock.
qam_mode		The modulation scheme used in the downstream direction.
Tx: tx_freq		Upstream frequency sent to the Cisco uBR900 series 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 0 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 headend.
TOD server		IP address of the time-of-day server at the headend.
Security server		IP address of the security server at the headend.
Timezone Offset		Correction received from the DHCP server to synchronize the Cisco uBR900 series
		time clock with the CMTS.
Config filename		Name of the file stored on the cable company’s TFTP server that contains operational
		parameters for the Cisco uBR900 series.
buffer size		Size in bytes of the BCM3300 message buffers.
RX data PDU ring:		Indicates the memory location of the beginning of buffer information for the receive
		data ring.
rx_head		Indicates current head buffer descriptor.
rx_p		Indicates current head packet descriptor.
RX MAC message ring:		Indicates the memory location of the beginning of buffer information for the receive
		MAC message ring.
rx_head_mac		Indicates current head buffer descriptor.
rx_p_mac		Indicates current head packet descriptor.
TX BD ring:		Indicates the memory location of the beginning of buffer information for the transmit
		buffer descriptor ring.

tx_count tx_head

head_txp tx_tail tail_txp

If tx_count is 0, or if tx_head and tx_tail are equal and there is no change for a period of time, it means there are packets stuck on the ring. This condition may be caused by the headend not giving grants.

The next packet descriptor to get used, along with its index.

The next packet descriptor to get sent, along with its index. When head_txp and tail_txp are the same, the transmit queue is empty.

74Cisco IOS Release 12.0(7)T