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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-05
Chapter1 Overview of Cisco uBR7200 Series Software
CiscouBR7200Series Router Configuration Overview
Note While most Cisco cable interface line cards transmit downstream signals to upconverters using a
44 MHz frequency, the MC16E transmits downstream IF signals to an upconverter using the
36.125MHz frequency. Only the MC16E cable interface line card supports full 8 MHz operation.
The cableinterface cards can be configured in a number of different upstream combinations based on
the card used, your cable network, and the anticipated subscription and service levels. Table1-7 shows
the DOCSIS and EuroDOCSIS data rates.
Cable Interface Line Card Slots
To display information about a specific cableinterface card slot’s downstream channel, use the
showinterfaces cable command with the cable modem line card’s slot number and downstream port
number in the following format:
show interfaces cable slot/downstream-port [downstream]
Use the slot number and downstream port number to display information about a downstream interface.
You can abbreviate the command to shintc. The following example illustrates the display for
downstream channel port 0 in cableinterface slot3 of a CiscouBR7246:
Router# sh int c 3/0
Cable3/0 is up, line protocol is up
Hardware is CMTS, address is 0009.0ed6.ee18 (bia 0009.0ed6.ee18
Internet address is 1.1.1.1/24
MTU 1500 bytes, BW 27000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
Encapsulation MCNS, loopback not set, keepalive not set
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 41000 bits/sec, 45 packets/sec
5 minute output rate 43000 bits/sec, 45 packets/sec
1616534 packets input, 184284660 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
1616534 packets output, 184284660 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
Table1-7 DOCSIS and EuroDOCSIS Data Rates
Upstream Channel Width Modulation Scheme Baud Rate Sym/sec Raw Bit Rate Mbit/sec
3.2 MHz QAM-16
QPSK
2.56 M 10.24
5.12
1.6 MHz QAM-16
QPSK
1.28 M 5.12
2.56
800 kHz QAM-16
QPSK
640 K 2.56
1.28
400 kHz QAM-16
QPSK
320 K 1.28
0.64
200 kHz QAM-16
QPSK
160 K 0.64
0.32