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Technology Stocks : Harmonic Lightwaves (HLIT)
HLIT 9.970-0.3%Dec 24 12:59 PM EST
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To: RJC2006 who wrote (1102)6/30/1997 2:46:00 PM
From: Stephen S Smith   of 4134
 
Bob, I'm no engineer but will take my best shot as no one else has. Original cable television systems in the US were built using a trunk/branch architecture with a sub-split frequency allocation. This was ideal for primary use of cable--the one way (downstream) distribution of broadband video.

With trunk/branch architecture the signal received by all originates at same location and passes through same trunk line for final distribution to the customer. The sub-split frequency allocation allocates virtually all available frequency to the downstream distribution of bandwidth and very little to the upstream transmissions necessary for two-way data. These two characteristics of traditional coax cable systems create one heck of a bottle neck when using contention based data routing.

For this reason, cable operators must convert their systems from trunk/branch architectures to star/bush designs with multiple coax 'nodes' served via direct line to the headend (point of signal origination). This limits the number of users of the precious upstream bandwidth to the number of persons hooked to each node. The best means for point-to-point distribution to these nodes is fiber optic cable. Hence the need to upgrade existing systems to HLIT's HFC system.
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