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Technology Stocks : Frank Coluccio Technology Forum - ASAP -- Ignore unavailable to you. Want to Upgrade?

To: Frank A. Coluccio who wrote (15)	9/30/1999 8:23:00 AM
From: Frank A. Coluccio	Read Replies (2) \| Respond to of 1782

Self Healing Related to this story, JRH asked on a another thread why self healing didn't kick in. I replied: JRH, "self-healing" is a service "option" which many ISPs elect to avoid due to what they feel is adequate robustness in their routing capabilities. Ah hem. Not all SONET routes are created equal, in this respect. Also, many SONET routes which do employ self healing use a cheaper design [two-fiber, as opposed to four-fiber, and some other subtle differences] which relegates half of their overall capacity to back up or standby status. When this occurs, you could easily regard an OC-192 as actually one that could only support OC-96, OC-48 as only an OC-24, etc., for the purposes of self-healing and overall service assurance. If a subscribing SP happens to be situated on the half of the system which is designated for "backup" channels (which operate just like regular production channels in the absence of an outage), and if they have elected to forego self healing, then they get "bumped," or preempted, during outages to make way for those who do pay. HTH. Regards, Frank Coluccio

To: Frank A. Coluccio who wrote (15)	9/30/1999 12:41:00 PM
From: Dennis O'Bell	Read Replies (1) \| Respond to of 1782

Reminds me of items in the GBLX prospectus about undersea cables and the risks caused by "fishing" trawlers... I'm somewhat curious about the technology used to repair these cables - splicing a 700-odd fiber cable can't be that trivial, especially when it's an undersea cable! Got any pointers? I don't currently follow the industry literature and am woefully ignorant about some of the technology.

To: Frank A. Coluccio who wrote (15)	10/6/1999 10:11:00 PM
From: Teddy	Read Replies (3) \| Respond to of 1782

Frank, a couple of thoughts/ questions on service interruptions, terrestrial and subsea. Am i understanding the news story you posted correctly? Message 11404556 A cable in Ohio was cut and the traffic was rerouted through London and Denmark. Don't carriers generally purchase capacity on other networks to insure against this type of event? The reason i ask is because, at the Glider Conference, Gary Winnick said a rule of thumb for international carriers is that at least 30% of capacity should be purchased on a separate network. Is that true? If so, it would seem reasonable to apply the same rule to terrestrial networks, no? Winnick also mentioned that the English Channel is the most frequent place where anchors snag cables. He said service calls are around $700,000 per cable.