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Motorola SB 51XX DOCSIS Specs
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Motorola SB 51XX DOCSIS Specs
For those asking what the correct levels are..

Here are the specs for the Motorola SB 51XX modems

Motorola SB51XX SURFboard DOCSIS 2.0 Cable Modem

General Features:
USB and 10/100Base-T Ethernet
F-connector, female, 75 ohm coaxial input
Data protocol: TCP/IP
Energy Star certified power adapter
Lead-free components (RoHS compliant)

Downstream:
Modulation: 64 or 256 QAM
Maximum Data Rate: DOCSIS < 38 Mbps
Bandwidth: 6 MHz
Symbol rate: 64 QAM 5.057 Msym/s, 256 QAM 5.361 Msym/s
Operating Level Range: -15 to +15 dBmV
Input impedance: 75 ohm

Upstream:
Modulation: 8, 16, 32, 64, 128 QAM or QPSK
Maximum Channel Rate: 30 Mbps
Bandwidth: 200 kHz, 400 kHz, 800 kHz, 1.6 MHz, 3.2 MHz, 6.4 MHz
Symbol rates: 160, 320, 640, 1280, 2560, 5120 ksym/s
Operating Level Range:

A-TDMA: +8 to +54 dBmV (32 QAM, 64 QAM), +8 to +55 dBmV (8 QAM, 16 QAM),
S-CDMA: +5 to +58 dBmV (QPSK), +8 to 53 dBmV (all modulations)


Output Impedance: 75 ohms
Frequency range: DOCSIS 5 to 42 MHz (edge to edge)
Knowledge=Power
02-09-2012, 03:25 PM
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