Re: [802.3_EXTND_EPON] Loop lengths
Hi Folks,
One additional item to point out is that the graphs only represent customers on 26 gauge unloaded copper. This would capture customers positioned close to a central office or remote terminal. It apparently does not include customers who were on heavier gauge copper (typically 24, 22, and 19 gauge or some combination of gauges, and/or loaded plant). These plant combinations allowed reach to customers at 35kft and greater (all copper, no electronics).
The number of customers beyond the 16kft shown in the graphs could be greater than or less than the number within 16kft. The proportion would depend on the geography of the central office. For example, in metro areas there would be a higher percentage of customers under 16kft, in suburban and rural areas, a larger share of customers would be beyond 16kft.
Bottom line is that these graphs do not help in determining the percentage of customers you could expect within a given reach as some portion of customers (significant number in some cases) are not represented.
Thanks, Martin
-----Original Message-----
From: Victor Blake [mailto:victorblake@xxxxxxxxxxxxxxx]
Sent: Wednesday, November 09, 2011 2:27 PM
To: STDS-802-3-EXTND-EPON@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_EXTND_EPON] Loop lengths
Glen, et. al.
Although loop length may be shorter on average, the maximum loop lengths
hasn't changed much. One way to look at it is that the distribution of loop
lengths is such that, when viewed as a probability distribution as shown in
the PPT, the curve is flattened. Stated another way, the average may be
shorter, but the min, max, and median are about the same.
-Victor
-----Original Message-----
From: Glen Kramer [mailto:gkramer@xxxxxxxxxxxx]
Sent: Wednesday, November 09, 2011 2:25 PM
To: STDS-802-3-EXTND-EPON@xxxxxxxxxxxxxxxxx
Subject: [802.3_EXTND_EPON] Loop lengths
Following up on the discussion at the meeting right now, here is an old
presentation from Verizon that showed their copper loop lengths. I don't
know if distribution of subscribers has changed significantly. Between 1983
and 1990, the loop lengths appear to shorten.
http://www.ieee802.org/3/efm/public/sep01/brown_1_0901.pdf (see slide 24)
Glen