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Q: Telephone glossary ( Answered 5 out of 5 stars,   0 Comments )
Subject: Telephone glossary
Category: Miscellaneous
Asked by: santana-ga
List Price: $2.00
Posted: 05 Aug 2002 17:27 PDT
Expires: 04 Sep 2002 17:27 PDT
Question ID: 51003
How many feet from the telephone central office would Load Point #4 be?
Subject: Re: Telephone glossary
Answered By: wengland-ga on 13 Aug 2002 14:41 PDT
Rated:5 out of 5 stars

It depends.  Assuming that everything was installed to specification,
the fourth load point would be at 21,000 feet from the telco.  The
load points are where load coils are placed by the telco to suppress
exactly the signal that DSL modems need to transmit high speed data on
-- high frequency.  The standard is for them to be placed every 6,000
feet, starting 3,000 feet from the central office.  However, it
appears that they may not all be placed evenly, or correctly.  The
following article details one engineers difficulties:

Outside Plant Magazine June 1999, Cleaning Up Old Analog Plant for
Digital Transport, by Don McCarty defines Load Coil and provides the specification for

Steve Elisberg ( posts in comp.dcom.isdn that: 
"The most common loading scheme used by the "Bell System", was H88.
That is, an 88 millihenry choke is placed at 6000' intervals. The
first is placed at 3000' from the central office. Thus, the "Load
Points" would be at 3kf, 9kf, 15kf,
21kf, 27kf and so on."

Don Kimberlin ( posts a great history of load
coils in comp.dcom.telecom at this URL:

The IEC provides a nice overview of load coils with graphics to help
illustrate their use at:

I hope this answers your question; if you need further information,
please ask for clarification before rating this answer.

Search Strategy:
pots distance load point @ Google Groups:

and at Google Web:

"Load Point #4" 
santana-ga rated this answer:5 out of 5 stars
Response was to the point and quite accurate!!

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