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To: ds1 who wrote (7696)11/18/1997 9:14:00 PM
From: SteveG  Read Replies (3) of 21342
 
<From hard experence a TDR will find a load coil and give you the
footage from where you are to the load coil.>

Thanks for the update ds1 (mind if I call you T1 for short?).

I'm wondering if there are various implementations of time domain reflectometry - is the same unit used to check LANs/cable and copper? And related to this, what kind of information would frequency domain reflectometry yield, since ADSL is frequency sensitive and dependant?

<I have enough confidence in a good TDR that i will even dig on the results to find a buried load coil. I have had to find my share working for Ameritech.>

Several questions for you:

Under what conditions (presuming you WEREN'T installing ADSL) was there a need to find and remove inductance coils for Ameritech? ISDN/HDSL?

In your experience with Ameritech, what percentage of lines in your territory would you guess had load coils, and what percentage of these had them buried?

And how many many hours (including truck roll) would you guess to remove the average load coil?

And is there any way to check a line for them without directly testing each twisted pair?

And under what conditions does TDR accuracy decrease? Line length?

And how complete did you find Ameritech's records to be regarding line conditions, including coils and taps?

Thanks in advance.

Steve
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