The pink 66 block field is divided into quadrants, one for each line card slot. The very top row should have (from left to right), pins 4 and 5 strapped together. The second row should also have pins 4 and 5 strapped together. This will restore the original factory wiring that provided interrupted ringing. Sorry for the crude depiction of how it should look, but here goes. I hope it makes sense:


_ 1 2 3 4__5

T - - - -<>- (<> means these should be strapped together).
R - - - -<>- (<> means these should be strapped together).
T - - - - -
R - - - - -
A - - - - -
A1 - - - - -
LG - - - - -
L - - - - -
RG - - - - -
RN - - - - -

It sounds like the top row has pins 3 and 4 strapped which would be 10VAC signaling.

This strapping is done at the factory with a piece of green wire. If it has been changed, it's probably either with a different-colored wire or with a bridge clip.

Ed Vaughn, MBSWWYPBX