show controllers cable-modem
Troubleshooting Tips for the Cisco uBR924 Cable Access Router 23
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 uBR924 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 uBR924 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 uBR924 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 uBR924 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 uBR924.
buffer size
Size in bytes of the BCM3300 message buffers.
RX data PDU ring:
rx_head
rx_p
Indicates the memory location of the beginning of buffer information for the receive
data ring.
Indicates current head buffer descriptor.
Indicates current head packet descriptor.
RX MAC message ring:
rx_head_mac
rx_p_mac
Indicates the memory location of the beginning of buffer information for the receive
MAC message ring.
Indicates current head buffer descriptor.
Indicates current head packet descriptor.
TX BD ring:
tx_count
tx_head
head_txp
tx_tail
tail_txp
Indicates the memory location of the beginning of buffer information for the transmit
buffer descriptor ring.
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.
Table 2
Show Controllers Cable-Modem Field Descriptions (continued)
Field
Description
