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Appendix A
System Specifications
Table A-8
EuroDOCSIS Cable Downstream RF Specifications (continued)
Specification
Burst noise
Seasonal/diurnal signal level variation
Signal level slope (50 to 750 MHz)
Maximum analog video carrier level
Minimum analog video carrier level
Digital Signal Levels
From headend
Signal as relative to adjacent video
signal
1. EuroDOCSIS specifications are baseline settings for an EuroDOCSIS-compliant, two-way cable system.
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 EuroDOCSIS-based, two-way cable systems.
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 radio-frequency carrier signal involving both amplitude and
phase coding.
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.
On the Cisco uBR7111E and Cisco uBR7114E routers, the DS0 connector is automatically muted when
Note
the DS0 RF port is enabled.
OL-5916-01
EuroDOCSIS Specifications
< 25 ms
8 dB
16 dB
+17 dBmV
–5 dBmV
–15 to +15 dBmV
–6 or –10 dBc
Cisco uBR7100 Series and Cisco uBR7100E Series Universal Broadband Router Hardware Installation Guide
Integrated Upconverter Specifications
1
2
Minimum Settings
< 25 ms
8 dB
16 dB
+17 dBmV
–5 dBmV
–15 to +15 dBmV
–6 or –10 dBc
Your Headend Settings
A-7
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Table of Contents
Troubleshooting
