SEXI: Mostly Fact, A Little Fiction, Not Vicious Attacks Message Board

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Microcap & Penny Stocks : SEXI: Mostly Fact, A Little Fiction, Not Vicious Attacks

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To: Billy Bob Dupree who wrote (7739)	11/25/1996 2:05:00 PM
From: telephonics	of 13351

It is very difficult to respond to this message. Can't you supply the specifications for your "line Driver" so I could be better able to offer constructive comment? If you don't have spec available, please identify manufacturer and model number. I can the obtain the specs on my own. Assuming you are referring to what I know as the original LightWave device your contention of being able to span the 8000 foot distance is correct. However I don't see the economic viability of doing this in the configuration you talk to. Let me summarize my thoughts in this regard. At one end of this lengthly twisted pair circuit you would place a transmitter and at the far end a receiver. This would provide for one way NTSC video as long as you had a receiver /transmitter pair in the middle of the line to act as a form of repeater. But one way video is not too usefull in video conferencing applications. Perforce you would then have to equip another twisted wire pair (Cat 3 as you referto it) with the same receiver/transmitter hardware. On top of this you would still need another twisted wire circuit to carry the audio. Building up to quite an expensive solution. The basic technology (regardless of which vendor's line driver employed) requires a 4.5Mhz bandwidth for the NTSC transmission. The basic law of Physic's that applies,( I was exposed to in EE101)-its called Shannon's law. This law defines the maximum amount of information one could theoreticall stuff into a given bandwidth of transmission capability. Now, not to drive the usual participant in this web site away-Consider a system running on a 10Mbs Local Area Network. Even the most non-technical among us can quickly calculate that such a LAn would become saturated with only three talking heads connected simultaneously. And for even these three to video conference the normal use of the LAN-Data Transmission -would have to be turned off. The 100mbs LAn would be an improvement but again how does the arithmatic demostrate the theortetical number of 1000 talking heads working thru this path at the same time. Other technical issues in my mind.The impedence mismatch at the junction of Cat 3 and Cat 5. Probably none but I don't know this yet. In the large LAN configuration I feel that capacitance variation especially on longer line length's could be an operational problem if your line driver requires "tuning" to accomodate its particuar line run length,and such adjustment is manual. Also once installed if a video subscriber has to relocate his desk and PC to a different office whaat fine tuning problem mught have to be accommodated which if you have manual adjestment would require cutting holes in the walls to gain access to the imbedded device which provides this adjustment, All of the above is not offered as criticism.It is merely my crude way of demonstrating why we who not connected with your employer (SEXI), ought to be provided with your line driver specs. Although I am not a member of the investment community in our country You have got to make peace with those who are, if your organization ever expects to dip toes into the venture or stock market again as a source of financial support.

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