Specifications

DOCSIS 1.1 for Cisco uBR905 and Cisco uBR925 Cable Access Routers and Cisco CVA122 Cable Voice Adapters
Command Reference
59
Cisco IOS Release 12.2(15)CZ
Timezone Offset Correction received from the DHCP server to synchronize the router 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 router.
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 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 CMTS not giving grants.
tx_head Indicates current head transmit packet descriptor.
head_txp The next packet descriptor to get used, along with its index.When head_txp
and tail_txp are the same, the transmit queue is empty.
tx_tail Indicates current tail transmit packet descriptor.
tail_txp 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.
TX PD ring: Indicates the memory location of the beginning of buffer information for the
transmit packet descriptor ring.
tx_head_pd Indicates current head packet descriptor.
tx_tail_pd Indicates current tail packet descriptor.
ehdr Extended MCNS header.
MIB Statistics
DS fifo full Number of times the downstream input first-in first-out (FIFO) buffer
became full on the router.
rerequests Number of times a bandwidth request generated by the router was not
responded to by the CMTS.
DS mac msg overruns Number of times the router’s DMA controller had a downstream MAC
message and there were no free MAC message buffer descriptors to accept
the message.
DS data overruns Number of times the router’s DMA controller had downstream data and there
were no free data PDU buffer descriptors to accept the data.
Qualified maps Number of times a MAP message passed all filtering requirements and was
received by the router.
Table 2 show controllers cable-modem Field Descriptions
Field Description