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Technology Stocks : Frank Coluccio Technology Forum - ASAP
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To: Frank A. Coluccio who wrote (459)11/25/1999 12:37:00 PM
From: ahhaha   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.
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