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Technology Stocks : The *NEW* Frank Coluccio Technology Forum
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To: Frank A. Coluccio who wrote (39)6/8/2000 11:22:00 AM
From: ftth  Read Replies (2) of 46821
 
re: >> "...and they do this all on a single fiber pulled to the residence using bi-directional wdm. A single fiber approach saves on materials, labor (number of splice points is halved) and reduces the potential points of failure."

I seem to remember reading a couple papers on the pros and cons of bidir-1fiber vs. unidir-2fiber approaches, and the unidirectional 2 fiber approach was the favored method in those papers.

Agreed that on initial deployment 1 fiber MAY be cheaper than 2 (depending on the fiber), and initial splice count is lower. I seem to remember there were arguments (reliability, performance, long-term cost, troubleshooting capabilities) against the "monolithic" bidirectional amplifiers vs. 2 unidirectional amplifiers, but the most significant point was that the 1 fiber, bidirectional approach has less total capacity to expand into, due to the guardband between the WDD (wavelength division duplexed) up and down bands. Seems there were also issues with add/drop and cross connect flexibility/interoperability in a system of all bidir-1fiber vs. unidir-2fiber, but that may not be an issue for certain architectures.

It's been a while since I read the papers mentioned, so this may not be an accurate account of the less significant reasons. Now if I could just remember where I read them<g>. Anyone that can add to this discussion please do.
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