Appendix A System Specifications
RF Specifications
RF Specifications
Table
Upstream Bandwidth | QPSK Data Throughput | 16 QAM Data Throughput |
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200 kHz | 0.3 Mbs | 0.6 Mbs |
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400 kHz | 0.6 Mbs | 1.2 Mbs |
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800 kHz | 1.2 Mbs | 2.3 Mbs |
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1600 kHz | 2.3 Mbs | 4.5 Mbs |
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3200 kHz | 4.6 Mbs | 9.0 Mbs |
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Downstream Bandwidth | 64 QAM Data Throughput | 256 QAM Data Throughput |
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6 MHz | 27.0 Mbs | 38.0 Mbs |
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8 MHz | 38.0 Mbs | 56.0 Mbs |
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DOCSIS Upstream and Downstream Specifications
The recommended settings listed in the following tables are based on a hybrid
Table
| Specification | DOCSIS Specifications1 | Minimum Settings2 | Your Headend Settings |
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| Frequency range | 5 to 42 MHz | 5 to 42 MHz |
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| Transit delay, CMTS to furthest | < 0.800 ∝sec | < 0.800 ∝sec |
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| Carrier to noise ratio | > 25 dB (QPSK3)4 | > 21 dB (QPSK)4 |
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| > 25 dB (16 QAM5)4 | > 24 dB (16 QAM)4 |
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| Carrier to ingress power ratio | > 25 dB | > 25 dB |
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| Carrier to interference ratio | > 25 dB (QPSK)4 | > 21 dB (QPSK)4 |
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| > 25 dB (16 QAM)4 | > 24 dB (16 QAM)4 |
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| Carrier hum modulation | < | < |
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| Burst noise | < 10 ∝sec | < 10 ∝sec |
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| Amplitude ripple | 0.5 dB/MHz | 0.5 dB/MHz |
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| Group delay ripple | 200 ns/MHz | 200 ns/MHz |
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| Micro reflections (single echo) |
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| Cisco uBR7100 Series and Cisco uBR7100E Series Universal Broadband Router Hardware Installation Guide |
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