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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here
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To: Frank A. Coluccio who wrote (4515)7/8/1999 10:03:00 AM
From: Frank A. Coluccio  Read Replies (2) of 12823
 
Thread, and to Darren, in particular, since you brought up this topic recently, although in a different context... I picked up this interesting post on the cable tv engineer's (SCTE) list. Enjoy!

Regards, Frank Coluccio

ps - the first quote below also demonstrates how the meaning of the term "broadband" has been mutilated and transformed by the manner in which it has been assimilated into a new lexicon.

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<<The thread re: bandwidth vs. throughput reminds me of when I taught broadband courses to clients with newly installed broadband data networks. I always heard "but isn't fibre faster?". When I responded that broadband is actually faster, they were always astounded. If you doubt this, compare the Vp of fibre to that of coax...>>

While fiber's velocity of propagation is technically less than that of most coaxial cables, the bandwidth of single mode optical fiber far exceeds that of the coaxial cable we use in our networks. Several years ago Larry Lockwood (now deceased) wrote an article in "Communications Technology" magazine about the theoretical bandwidth of single mode optical fiber.

In that article he went through the calculations and showed that an individual strand of single mode optical fiber has a theoretical bandwidth of about 20 THz. That's roughly equivalent to the ability to be able to simultaneously carry over 3 million 6 MHz wide analog NTSC channels on one fiber! Of course, the real-world limitation is the electronics attached to the ends of the fiber, but this clearly showed the potential of the glass we're using in our networks.
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