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Technology Stocks : CellularVision (CVUS): 2-way LMDS wireless cable. -- Ignore unavailable to you. Want to Upgrade?

To: Tiger who wrote (769)	12/10/1997 11:51:00 PM
From: Night Writer	Respond to of 2063

Tiger Doesn't the speed just about blow everything else alway anyway you look at it. NW

To: Tiger who wrote (769)	12/11/1997 7:18:00 AM
From: Hiram Walker	Read Replies (3) \| Respond to of 2063

Tiger and Night Writer,it is a Telco return system that CVUS is using. They have not converted to a 2-way reverse polarization system. This is a big architectural shift,and I think they will move slowly with this. The need for upstream speed is not really there yet, until we want full interactive video and games. Also our computers and NIC's will only require at most 10 mbps. They are giving you what is needed now,in hopes of generating earnings for future upgrades,when they are required. I would love to see a 2-way system,but its not going to be right now. Hiram

To: Tiger who wrote (769)	12/11/1997 11:32:00 AM
From: WTC	Respond to of 2063

The downstream bps to upstream bps are constrained in TCP/IP by the requirement for acknowledgement packets. The announcement suggests a ~60:1 ratio, which is more than usually implemented (14 or 15:1 is common). The ratio usually comes from big packets down and nearly empty ack packets going up; to get to 60, they may be spoofing the hub terminal into thinking it is getting subscriber terminal acks that the system is inserting for the subscriber. This gets tricky if there is more than a trivial bit error rate in the link. The way the LMDS modem is implemented, this is certainly doable, but I don't know the details of the hardware and IP implementation. The world calls this a "two way system" -- because it is: upstream and downstream. What it is not is a "two way wireless system". The internet itself will have to come a long way before real 1500kb/s in a subscriber access link acts as any choke on data throughput. I would expect a user judging performance by the speed his screen paints would rarely if ever perceive a difference between real 1.5mb/s vs 8.0mb/s internet access service -- he just is not getting that sort of data transfer rate from his end-end backbone link to a distant server, and the server itself or the ISP router at the distant end may be parsing out data at a much lower rate. The hype about incredible internet data rates can be fun, though. Just keep the salt shaker handy ...