Re: [802.3_EXTND_EPON] Loop lengths
Hugh,
I don't see what this has to do with fill rate (what we usually call
take-rate). When an overbuild is done, extending the fiber 'deeper' it can
obviously remove distance from the copper plant when the fiber is used to
overbuild that distance of copper. But other lengths will remain
un-affected. I agree that min/max stay the same because those are basically
FTTB or FTTC already (min) or in many cases for max no fiber at all.
-Victor
-----Original Message-----
From: Hugh Barrass (hbarrass) [mailto:hbarrass@xxxxxxxxx]
Sent: Wednesday, November 09, 2011 4:01 PM
To: Victor Blake; STDS-802-3-EXTND-EPON@xxxxxxxxxxxxxxxxx
Cc: Hugh Barrass (hbarrass)
Subject: RE: [802.3_EXTND_EPON] Loop lengths
Sorry, I'm not in the room, so I'm looking at it from a purely theoretical
basis.
Given the geography doesn't change (i.e. the houses stay in one place), such
an effect may come from a higher fill rate. Unless the point of presence is
very badly placed, geometry will dictate that the average length will
shorten as the fill rate increases - with no change to the min or max.
Hugh.
-----Original Message-----
From: Victor Blake [mailto:victorblake@xxxxxxxxxxxxxxx]
Sent: Wednesday, November 09, 2011 12:27 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