Table of Contents
Advertisement
Electrical Input and Output
Electrical Input and Output
The information in
Table B-9
Parameter
Center frequency
Level range (one channel)
Modulation type
Symbol rate (nominal)
Bandwidth
Total input power (40–900 MHz)
Input (load) impedance
Input return loss
Connector
Table B-10
Parameter
Frequency
Level range (one channel)
Modulation type
Symbol rate (nominal)
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
B-8
Table B-9
and
Table B-10
Electrical Input to the Cable Modem
Value
•
•
•
•
QAM-64 and QAM-256
•
•
•
•
< 30 dBmV (90 dBmicroV)
75 ohms
•
•
F connector per ISO-169-24 (common with the output)
Upstream Electrical Output from the Cable Modem
Value
•
•
•
•
QPSK and QAM-16
160 ksym/sec
320 ksym/sec
640 ksym/sec
1280 ksym/sec
2560 ksym/sec
relates to both DOCSIS and EuroDOCSIS specifications.
DOCSIS: 91 to 857 MHz ±30 kHz
EuroDOCSIS: 112 to 858 MHz ±30 kHz
DOCSIS: –15 dBmV to +15 dBmV
EuroDOCSIS: 43 to 73 dBmicroV for QAM-64
47 to 77 dBmicroV for QAM-256
DOCSIS: 5.056941 Msym/sec (QAM-64) and 5.360537
Msym/sec (QAM-256)
EuroDOCSIS: 6.952 Msym/sec for QAM-64 and
QAM-256
DOCSIS: 6 MHz
–
18% square root raised cosine shaping for QAM-64
–
12% square root raised cosine shaping for QAM-256
EuroDOCSIS: 8 MHz
15% square root raised cosine shaping for both
–
QAM-64 and QAM-256
DOCSIS: > 6 dB (88–860 MHz)
EuroDOCSIS: > 6 dB (85–862 MHz)
DOCSIS: 5 to 42 MHz edge to edge
EuroDOCSIS: 5 to 65 MHz edge to edge
QAM-16: +8 to +55 dBmV (+68 to +115 dBmicroV)
QPSK: +8 to +58 dBmV (+68 to +118 dBmicroV)
Appendix B
RF Specifications
OL-17309-01
Advertisement
Table of Contents
Troubleshooting
