Terayon Communications Systems Message Board

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : Terayon Communications Systems

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next

To: Shawn Fisher who wrote (32)	8/7/1998 6:47:00 PM
From: Bernard Levy	Read Replies (1) of 48

Hi Shawn: Your interpretation is correct. To be able to transmit a large number of bits per Hz per second through the use of a high order QAM 64 or 256 QAM, you need a high signal to noise ratio. 256 QAM can transmit 40Mb/sec per 5MHz downstream channel, i.e. 8 bits/Hz/sec. The existing Terayon modem offers only about 14 Mb/sec downstream and upstream, but it can accommodate a lot of noise. Terayon is claiming that their next generation S-CDMA modem will offer 40Mb/sec downstream and 30 Mb/sec upstream per 5Mhz channel, but I find this claim had to believe because it would require spreading a high-order QAM signal. I have never seen CDMA applied to high-order QAM (current wireless CDMA systems use QPSK). I think that ultimately, cleaning the channel is the best option as you suggest. S-CDMA buys time for cash-strapped operators, but in the long run, cable companies will want an upgraded plant. Best regards, Bernard Levy

Report TOU Violation

Share This Post

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next