Subscriber Line Measurement and SLAC Settings

From: Bond (bond_jays_at_hotmail.com)
Date: 04/21/04 

Date: 21 Apr 2004 02:22:28 -0700

Hi,

I am working on POTS line card with Quad ISLAC and ISLIC on it. I need
to set the SLAC parameters based on the Subscriber Loop Length for
which I use WinSlac software provided by Legerity for calculating the
SLAC parameters.

1. Is there any guidelines ( country specific standards ) on how to go
about it like how the parameters are to be set for Short Loop or Long
Loop?.

2. For certain short loop length I am operating in constant current
region and then in resistive feed. On what basis we should go about
deciding the region till when to maintain constant current feed?.
Right now if my loop resistance becomes more than 650 Ohms (an approx
value) it operate in resistive feed. If anyone have worked on these
guide me on this regard.

3. The Loop Resistance of a subscriber line is a combination of Cable
resistance and Station resistance (i.e Phone Resistance ) . From POTS
side we can only determine the Loop resistance as a whole, how to know
that the station resistance is so much and the Cable resistance is so
much?. How this is been done in real senario?.

If you guys know any Books or standards which tells how to do Line
measurements on POTS subscriber line can you refer it.

Regards,

BOND

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