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

To: Frank A. Coluccio who wrote (459)	11/25/1999 12:35:00 AM
From: Frank A. Coluccio	Read Replies (1) \| Respond to of 1782

Re: "Advances in undersea connector technology improve efficiency" By Stewart Barlow, Ocean Design Inc. (intro posted here for posterity; for best viewing, complete with graphics and photos, go directly to Lightwave Mag: lw.pennwellnet.com ) -----begin snip: "Wet-mateable connectors simplify network buildouts and allow upgrades and maintenance on the seafloor. Imagine connecting eight-way fiber-optic cable segments on the murky deep-sea floor. Sound impossible? Well, it's not. Over the last three years, seafloor fiber-optic networks have been laid in several ocean environments, including the North Sea and abyssal Pacific. The connector technology is here, and it works. It enables an operational flexibility that greatly reduces the cost of installing and maintaining seafloor communication systems. Today's technology allows, for instance, connectorized branching units, repeaters, and universal splices. Telecommunications cables can be deployed with dormant branching points. Later, remotely operated vehicles (ROVs) or autonomously operated vehicles (AUVs) can plug in extensions as they are needed. All that is possible without the usual recovery of the parent cable or a dormant pigtail cable. These wet-mateable connectors are rugged--tough enough to support launching through cable engines to full ocean depths, including direct burial. Undersea telecommunications cables, which heretofore have been deployed as continuous strings of segments joined by costly, time-consuming shipboard splices, can now be connectorized in advance and simply plugged together sequentially when launched, greatly reducing ship time. Another advantage of undersea systems using wet-mateable connectors is that damaged cable segments, repeaters, and branching units can be replaced at the seafloor by unplugging the devices and plugging in new ones. What took so long? Why haven't wet-mateable connectors been viable sooner? Certainly, the use of optical cables undersea is now quite mature, with the first transatlantic telecommunications cable (TAT-8) deployed in the late 1980s." -----end snip Continued at: lw.pennwellnet.com

To: Frank A. Coluccio who wrote (459)	11/25/1999 12:37:00 PM
From: ahhaha	Respond to of 1782

In the distant past all local calls were routed through a room in the CO which had "operators" using a plug board. This was n^2 random access connectivity. To go beyond a CO's area into another area code required operator assistance. The operator had to open a long distance line and then request that the remote operator ring up the desired party and then the two would cooperate and connect all three lines. This is product[n(i)^2] connectivity where i is the number of areas and n(i) is the number of possible connections in the i-th area. With POTS now there is no "sharing" within a CO area(I don't know how many COs serve an area code), but there is a kind of sharing between the i areas. The sharing takes place because the calls are aggregated in one cable in the i-th area and within a broadband on the separate physical lines within the cable. It probably isn't the case that no matter how low you go in the priority structure, no call can "bump" another, that is, up to military priority. In that case someone is bumped. In my previous posts I had assumed that the "cable" had QoS in some of its lines, but which is not normally used, so that when the volume of calls rises the extra lines are called into service. Routing or re-routing through another, the i-k th area cable, would occur in order to enable access to a given area if the capacity of the main line serving the i-th area was reached. In a physical break of the k-th cable re-routing may not be possible because of volume, and so someone is shut out. If the topology of the area layout is ordered so that some big cable is supporting trunk cables and if the topology is no weaker than a lattice, then an area upstream might be down while an area downstream is up. Perpend.