Appendix A System Specifications
Integrated Upconverter Specifications
Table A-8 EuroDOCSIS Cable Downstream RF Specifications (continued)
Specification | EuroDOCSIS Specifications1 | Minimum Settings2 | Your Headend Settings |
Burst noise | < 25 ms | < 25 ms |
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Seasonal/diurnal signal level variation | 8 dB | 8 dB |
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Signal level slope (50 to 750 MHz) | 16 dB | 16 dB |
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Maximum analog video carrier level | +17 dBmV | +17 dBmV |
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Minimum analog video carrier level |
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Digital Signal Levels |
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From headend |
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Signal as relative to adjacent video |
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signal |
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1.EuroDOCSIS specifications are baseline settings for an
2.Minimum settings are slightly different than the EuroDOCSIS settings to account for cable system variations over time and temperature. Using these settings should increase the reliability of
3.Transit delay is defined as the “round trip” from the cable headend to the furthest customer and back.
4.QAM = Quadrature Amplitude Modulation: a method of modulating digital signals onto a
5.These settings are measured relative to the digital carrier. Add 6 or 10 dB, as determined by your company’s policy and derived from the initial cable network setup, relative to the analog video signal.
6.dBc = decibels relative to carrier.
7.ns = nanoseconds.
Integrated Upconverter Specifications
The integrated upconverter that is installed in the Cisco uBR7100 series chassis meets all DOCSIS and EuroDOCSIS specifications. The upconverter outputs an RF signal and operates in the frequency range of 55 to 858 MHz (band center). The output range is +50 to +63 dBmV at 64 and 256 QAM; the output can go down to +45 dBmV but with degraded power accuracy.
Note The integrated upconverter output is available on the downstream port labeled DS0 RF. The downstream labeled DS0 outputs an IF signal that must be put through an external upconverter before use.
Note On the Cisco uBR7111E and Cisco uBR7114E routers, the DS0 connector is automatically muted when the DS0 RF port is enabled.
Cisco uBR7100 Series and Cisco uBR7100E Series Universal Broadband Router Hardware Installation Guide
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