CMTS Upstream SNR Revisited

摘要

There was an interesting thread on the SCTE-List recently about cable modem termination system (CMTS) upstream signal-to-noise ratio (SNR). One cable operator reported having difficulty "obtaining upstream SNRs above the 25-26 dB range, even with plant that is node+1." He went on to ask, "Does anyone have any suggestions on how to move to the 28-30 dB level?" Someone else won-dered whether there is some reliance one can place on anomalies being reported by the CMTS as faulty, using only the SNR reading. I jumped right in the middle of the discussion, and my SCTE-List comments serve as the basis for this month's column.