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Appendix A
System Specifications
RF Specifications
Table A-3
Typical RF Upstream Bandwidth and Modulation
Upstream Bandwidth
200 kHz
400 kHz
800 kHz
1600 kHz
3200 kHz
Table A-4
Typical RF Downstream Modulation
Downstream Bandwidth
6 MHz
8 MHz
DOCSIS Upstream and Downstream Specifications
The recommended settings listed in the following tables are based on a hybrid fiber-coaxial cable (HFC)
network in which the digital signal is carried 10 dB below the adjacent analog video channel. If the
digital signal on your network is carried 6 dB below the adjacent analog video channel, add 4 dB to the
recommended settings in
Table A-5
DOCSIS Cable Upstream RF Specifications
Specification
System/Channel
Frequency range
Transit delay, CMTS to furthest
customer
Carrier to noise ratio
Carrier to ingress power ratio
Carrier to interference ratio
Carrier hum modulation
Burst noise
Amplitude ripple
Group delay ripple
Micro reflections (single echo)
OL-5916-01
QPSK Data Throughput
0.3 Mbs
0.6 Mbs
1.2 Mbs
2.3 Mbs
4.6 Mbs
64 QAM Data Throughput
27.0 Mbs
38.0 Mbs
Table A-5
DOCSIS Specifications
5 to 42 MHz
< 0.800 μsec
> 25 dB (QPSK
> 25 dB (16 QAM
> 25 dB
> 25 dB (QPSK)
> 25 dB (16 QAM)
6
< –23 dBc
(7%)
< 10 μsec
0.5 dB/MHz
200 ns/MHz
–10 dBc @ < 0.5 μsec
–20 dBc @ < 1.0 μsec
Cisco uBR7100 Series and Cisco uBR7100E Series Universal Broadband Router Hardware Installation Guide
and
Table
A-6.
1
Minimum Settings
5 to 42 MHz
< 0.800 μsec
3
4
)
> 21 dB (QPSK)
5
4
)
> 24 dB (16 QAM)
> 25 dB
4
> 21 dB (QPSK)
4
> 24 dB (16 QAM)
< –23 dBc (7%)
< 10 μsec
0.5 dB/MHz
200 ns/MHz
–10 dBc @ < 0.5 μsec
–20 dBc @ < 1.0 μsec
RF Specifications
16 QAM Data Throughput
0.6 Mbs
1.2 Mbs
2.3 Mbs
4.5 Mbs
9.0 Mbs
256 QAM Data Throughput
38.0 Mbs
56.0 Mbs
2
Your Headend Settings
4
4
4
4
A-3
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Troubleshooting
