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Technology Stocks : The *NEW* Frank Coluccio Technology Forum

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To: GraceZ who wrote (3412)	7/25/2001 6:17:58 PM
From: Frank A. Coluccio	Read Replies (1) of 46821

Grace, this goes back to your question in the uplinked post. I came across a more descriptive set of diagrams in a reply from a NANOG poster who was addressing a similar question. See Figure 15 in the following white paper titled: Optical Fiber Networks: Linear and Ring Topologies, from G3M Corp: g3m.com The straight line going through the span between Nodes E and F represents the cable break. Note the dotted lines within Nodes E and F, which represent the wrap-arounds (aka loopbacks). This particular type of ring is a 4-fiber bidirectional line switched ring (4Fiber BLSR). It has the ability to restore more types of failures than the 2Fiber BLSR (hey, way a minute... it has more fibers, so by definition it would have to have the capability to restore more!) and node failures than the UPSR or 2Fiber-BLSR, as explained in the accompanying text. It is also capable of restoring the entire rated payload of the ring instead of only half, as is the case with 2Fiber Rings, which the text also touches on. HTH. FAC

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