DOCSIS 1.0/ 1.1 Equivalent Cable Modem
Appendix A: Cable Modem Specifications
Table 4. RF Downstream Specification
PARAMETER |
| VALUE | NOTES |
Center Frequency |
| 91 MHz to 857 MHz +/- 30 kHz |
|
|
|
|
|
Level Range |
| One Channel | |
|
|
|
|
Symbol Rate |
| 5.056941 Msym/sec (30 Mbps) | 64QAM |
|
| 5.360537 Msym/sec (43 Mbps) | 256QAM |
Bandwidth |
| 6 MHz |
|
|
|
|
|
Total Input Power |
| <30 dBmV |
|
|
|
|
|
Input Impedance |
| 75 Ohms |
|
|
|
|
|
Input Return Loss |
| >6 dB | 88 MHz to 860 MHz |
|
|
|
|
Table 5. RF Upstream Specification |
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|
|
PARAMETER |
| VALUE | NOTES |
Frequency |
| 5 MHz to 42 MHz | Edge to Edge |
|
|
|
|
Level Range |
| +8 to +58 dBmV | QPSK |
|
| +8 to +55 dBmV | 16QAM |
Modulation |
| QPSK and 16QAM |
|
|
|
| |
Symbol Rate | 320K,640K,1280K,2560K,5120Kbps | QPSK | |
|
| 640K,1280K,2560K,5120K,10240Kbps | 16QAM |
Bandwidth |
| 200K, 400K, 800K, 1600K, | At Edges |
|
| and 3200 KHz |
|
Output Impedance |
| 75 Ohms |
|
|
|
|
|
Output Return Loss |
| >6 dB | 5 MHz to 42 MHz |
|
|
|
|
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