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To: ftth who wrote (2680)	12/31/1998 11:12:00 AM
From: Frank A. Coluccio	Respond to of 12823

Dave, you've brought to the table some interesting points, contrasting Denver's explanations, and adding yet another connotation to the term "overlay." I asked Denver for his interpretations of overlay and overbuild, because I was confident that I would get the right answers from him, which I did, in terms of Cable TV Co outside distribution plant initiatives. But your point about overlaying signals in a more generic sense illustrates that there are multiple meanings for this term, some of which are very loosely supported from a semantic standpoint, but commonly used, nonetheless. The author in the SCTE clip I posted upstream demonstrates this point, since he uses the term several times (which are common usages), discussing the superimposition of signals onto extant plant facilities. There are other connotations for the term 'overlay' in traditional common carrier circles, as well. An ILEC, for example, may have several hundred SONET Rings in place within its serving area. One could focus solely on this SONET topography and regard it as a SONET overlay. This isn't written into any standard terminology or Newtonesque-like bible, that I am aware of (although it may be) but this is how operating staff refer to their SONET Nets when they first go in. The same as they do with FrameRelay and ATM. In this case, the SONET overlay may have been placed onto the same serving areas that were previously served by the more traditional asynchronous T-1/T-3 Networks [pre-SONET]. If Digital Cross-connect Systems are used, these can be regarded as yet another form of overlay, that of the DCS overlay. I recently viewed BEL's DCS overlay network consisting of close to a hundred DCSs in one state alone. These can be viewed as both physical (at the pipe level) overlays, and as virtual (at the SONET line and path) levels, as defined by the internal mappings of DCS ports. There are also the area code overlays that are now being used for a number of reasons, the most notable being for wireless phones and pagers. These area code overlays transcend the normal geographical boundaries of the North American Numbering Plan Areas [NANPAs], through enabling technologies found in SS7 and AIN. In this sense, the 917 area code, for example, is regarded as the NPA for wireless subscribers who ordinarily would fall under numerous other NPAs [212, 718, 516, 201, 908, etc] for landline use. --- While we're on this topic, does anyone remember the name of the individual who first produced the foils that demonstrated the various anatomical overlays of the human body, and other biological specimens?

To: ftth who wrote (2680)	12/31/1998 2:34:00 PM
From: Frank A. Coluccio	Read Replies (1) \| Respond to of 12823

Dave, I re-read my original post to you re this overlay issue, and it appears that I may have inadvertently cast some side tones implying that your answer may not be as adequate as Denver's was. Not at all. In fact, Denver focused on new builds, upgrades, etc. and you dealt with the other aspects of signaling "overlays." My point was that the term has many different connotations today. Sorry if there was any misunderstanding there, and I appreciate your contributions, as always. Frank C.