User's Manual

DCM-604 Series Cable Modem
User’s Manual
27
Appendix: Cable Modem Specification
Table 1. RF Downstream Specification (DOCSIS)
Parameter Value Notes
Frequency range 88 MHz to 860 MHz +/- 30 kHz
Demodulation 64QAM. 256QAM
Input power range -15 dBmV to +15 dBmV One Channel
Symbol Rate 5.056941 Msym/sec (30 Mbps)
5.360537 Msym/sec (43 Mbps)
64QAM 256QAM
Bandwidth 6 MHz
Total Input Power <30 dBmV
Input Impedance 75 Ohms
Table 2. RF Upstream Specification (DOCSIS)
Parameter
Value
Frequency Range 5 MHz to 42 MHz
Modulation QPSK, 8QAM, 16QAM, 32QAM, 64QAM, 128QAM
(SCDMA only)
Symbol Rate TDMA: 160K, 320K, 640K, 1280K, 2560K,
5120Ksym/sec
S-CDMA: 1280K, 2560K, 5120Ksym/sec
Bandwidth
TDMA:
200K, 400K, 800K, 1600K, 3200K,
6400KHz S-CDMA: 1600K, 3200K, 6400KHz
Output power TDMA QPSK: 8 ~ 58 dBmV
8/16QAM: 8 ~ 55 dBmV
32/64QAM: 8 ~ 54 dBmV
S-CDMA QPSK, 8/16/32/64/128QAM: 8 ~ 53
dBmV
Output Impedance 75 Ohms
Table 3. RF Downstream Specification (for EuroDOCSIS system)
Parameter Value Notes
Frequency Range 108 MHz to 862 MHz
Demodulation 64QAM. 256QAM
Input power range +13dBmV to -17dBmV (65QAM)
+17dBmV to -13dBmV (256QAM)
Symbol Rate 056941 Msym/sec (30 Mbps)
5.360537 Msym/sec (43 Mbps)
64QAM 256QAM
Bandwidth 8MHz
Total Input Power <30 dBmV
Input Impedance 75 Ohms