Cisco UBR924 - uBR 924 Router Troubleshooting Tips page 23

Table 2 Show Controllers Cable-Modem Field Descriptions (continued)
Field
data mcfilter
DS
US
Tuner: status
Rx: tuner_freq
symbol_rate
local_freq
snr_estimate
ber_estimate
lock_threshold
qam_mode
Tx: tx_freq
power_level
symbol_rate
TFTP server
TOD server
Security server
Timezone Offset
Config filename
buffer size
RX data PDU ring:
rx_head
rx_p
RX MAC message ring:
rx_head_mac
rx_p_mac
TX BD ring:
tx_count
tx_head
head_txp
tx_tail
tail_txp
Description
MAC control filter for data.
Downstream Broadcom receiver chip number and ID.
Upstream Broadcom transmitter chip number and ID.
Current status of the tuner.
Downstream frequency (in Hz) that the Cisco uBR924 searched for and found.
Downstream frequency in symbols per second.
Frequency on which the transmitter and the tuner communicate.
Estimate of signal-to-noise ratio (SNR) in Db X 1000.
Estimate of bit error rate (always 0).
Minimum signal-to-noise ratio (SNR) that the Cisco uBR924 will accept as a valid lock.
The modulation scheme used in the downstream direction.
Upstream frequency sent to the Cisco uBR924 by the CMTS in the UCD message.
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.
Upstream frequency in symbols per second.
IP address of the TFTP server at the headend.
IP address of the time-of-day server at the headend.
IP address of the security server at the headend.
Correction received from the DHCP server to synchronize the Cisco uBR924 time clock
with the CMTS.
Name of the file stored on the cable company's TFTP server that contains operational
parameters for the Cisco uBR924.
Size in bytes of the BCM3300 message buffers.
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.
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.
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.
Troubleshooting Tips for the Cisco uBR924 Cable Access Router 23
show controllers cable-modem