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To: ftth who wrote (2524)	12/10/1998 5:26:00 AM
From: Hiram Walker	Respond to of 12823

Dave, I don't disagree with your assessment, Mike was looking for the implementation of 2-way coax,without having to upgrade to HFC. The return path robustness of s-CDMA is without question the most effective means over overcoming signal deterioration. The reason it is being used in Japan especially,is the level of infrastructure there. Most all of the Japanese cable is still coax,so they need a system like Terayon's. But Cable Labs is looking at making s-CDMA standard. I do not believe it will be necessary on upgraded 750 Mhz systems,but smaller ops that cannot afford to upgrade will look closely at this. CableLabs Selects Broadcom and Terayon to Author Advanced Modem Technology Proposals LOUISVILLE, Colo.--(BUSINESS WIRE)--Nov. 13, 1998--Cable Television Laboratories, Inc. (CableLabs®) has selected Broadcom Corporation (NASDAQ:BRCM - news) and Terayon Communication Systems (NASDAQ:TERN - news) to author a detailed technical proposal and specification on next generation physical layer technology for possible integration into the Data Over Cable Service Interface Specification (DOCSIS). The next generation physical layer is an important extension for DOCSIS because the robustness of these types of technologies will enable more cable systems to deliver higher speed two-way cable services and allow cable companies to increase the data capacity of their networks. By including an advanced physical layer to DOCSIS, creating DOCSIS 1.2 specification, the cable industry will add more advanced technologies to the modem specification. The 1.2 technology will co-exist with earlier iterations of DOCSIS technology. Additional authors may be asked to contribute to the proposal. Vendors with field-proven solutions, who participate in the specification drafting process, will have to agree to contribute their technology to the DOCSIS royalty-free pool, as Broadcom and Terayon have done. This effort recognizes the work of the IEEE 802.14, which, at its recent meeting voted to adopt a combination of Broadcom's Advanced Frequency Agile (TDMA) technology and Terayon's SCDMA (synchronous code division multiple access) technology as the basis for its advanced physical layer standard. Meanwhile, the cable television industry's DOCSIS process, which is managed by CableLabs on behalf of its member companies, also has been considering extensions to its specification for delivery of high-speed data over cable networks. This is all PHY layer specs,no upper layers involved. Hiram

To: ftth who wrote (2524)	12/10/1998 8:37:00 AM
From: Hiram Walker	Respond to of 12823

Dave, a few other things, the node size is dropping fast,TCOMA is going to 250 or under per node for ATHM for advanced services. They can do this without much physical alteration using advanced optoelectronics with invisible hubs. On the upstream QPSK is more robust than QAM,but takes up more bandwidth and is less efficient. I personally would go with QAM 16 or 64 if I could upstream with an HFC system. Most cable modems are using QPSK upstream from what I have read(LANCity). There are so many tradeoffs and issues concerning modulation techniques,that it is hard to know what the head engineers at each cable company are thinking. But if you decide not to upgrade to 2 way HFC,s-CDMA is a way to get enough robustness to do it over coax. Hiram