Installation guide

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Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 2 Configuring the Cisco CMTS for the First Time
Using the Setup Facility for Cable Interfaces
Identifying the Cable Interface
The Cisco uBR7100 series routers feature a fixed cable interface at slot 1. On the Cisco uBR7111 and
Cisco uBR7111E universal broadband routers, the cable interface supports one downstream modulator
and one upstream demodulator. On the Cisco uBR7114 and Cisco uBR7114E universal broadband
routers, the cable interface supports one downstream modulator and four upstream demodulators.
On all models, the cable interface has the following characteristics:
– The cable interface supports the following defaults: QAM-256 at 40 MBps downstream, and
QAM-16 at 5 Mbps upstream.
– The card supports upstream channel widths of 200 kHz, 400 kHz, 800 kHz, 1.6 MHz, and
3.2 MHz.
– The card outputs +42 dBmV and +/- 2 dBmV.
– The downstream modulator has both an RF output, using the integrated upconverter, and an IF
output, which must be connected to an external upconverter.
Note The Cisco uBR7111 and Cisco uBR7114 default to transmitting downstream signals to the
integrated upconverter using a 44 MHz frequency. The Cisco uBR7111E and
Cisco uBR7114E default to transmitting downstream IF signals to the integrated
upconverter using the 36.125 MHz frequency.
The cable interface 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. Table 2-1 shows
the DOCSIS and EuroDOCSIS data rates.
Cable Interface Card Slots
On Cisco uBR7100 series routers, the cable modem card is fixed and is always slot 1. To display
information about a specific cable interface slot’s downstream channel, use the show interfaces cable
command with the CM card’s slot number and downstream port number in the following format:
show interfaces cable slot/downstream-port [downstream]
Table 2-1 DOCSIS and EuroDOCSIS Data Rates
Upstream Channel
Width
Modulation
Scheme
Baud Rate
Sym/sec
Raw Bit Rate
Mbit/sec
3.2 MHz 16 QAM
QPSK
2.56 M 10.24
5.12
1.6 MHz 16 QAM
QPSK
1.28 M 5.12
2.56
800 kHz 16 QAM
QPSK
640 K 2.56
1.28
400 kHz 16 QAM
QPSK
320 K 1.28
0.64
200 kHz 16 QAM
QPSK
160 K 0.64
0.32