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Technology Stocks : Terayon Communications Systems
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To: Shawn Fisher who wrote (32)8/7/1998 6:12:00 PM
From: Geof Hollingsworth   of 48
 
Hi Shawn,

Let me chime in with what I remember, and I expect Bernard can then put us both on the right track! I have seen the noise/throughput graphs from the meetings a few weeks ago, but don't have a copy. In general, your concept is right-S-CDMA gives slightly better throughput (bits/hertz) than QPSK in the upstream for ingress in the noise region you indicated (<19db but greater than 0), including the notch-filter approach proposed by Broadcom. QAM16 is not relevant here (only used in upstream). They are both significanly inferior to VC/DMT in that noise range, and VC/DMT continues to perform (at degraded performance levels) long after the S/N would knock both QPSK and S-CDMA off the air. As a result, expect the terms of engagement to shift, with Broadcom (and perhaps Terayon) arguing that strong ingress noise is not that big a problem in cable plants when the committee gets together next month.
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