Information on signal levels: http://homepage.ntlworld.com/robin.d.h.walker/cmtips/signal.html

Downstream power level (Receive): -12dbmV to +12dbmV
A value below -12 indicates a poor downstream signal. A tech would aim for a value close to the optimal 0 dBmV, but a good cable modem should be capable of working within the broader range of -15 to +15 dBmV, provided the downstream Signal to Noise Ratio remains good enough.

Upstream (Transmit): +35dbmV to +50dbmV.
A value within the range +35 to +50 dBmV is within spec with 40's the most common.

Carrier/Noise Ratio: greater than 33dB .
The downstream Signal to Noise Ratio must be 30 dB or higher, and should ideally be 33 dB or higher. The lower ratio the more noise and the poorer the performance. The Cable Modem will have to keep requesting retransmissions of packets with uncorrectable errors.

Please visit the following thread for the latest on this issue: »Charter HSI: Acceptable Signal Specifications

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by stan999 edited by defiant
last modified: 2007-10-08 19:47:04