Ok - Sorry to open an old post - but I am installing a 551C - with 4 400H line cards and ring generator. I will be attaching various Western Electric phones - some dial, some push button, desk and wall - all 6 button. I am going to use all 4 CO Lines - and NO Intercom. I desire to have all 4 lines ring on each phone.

So, from what I gathered, the first 12 pairs are punched down for lines 1 thru 4. I would then Strap all 4 CA terminals and attach the Slate/Yellow (Pair 20) to the "strapped" CA pins and the Yellow/Slate to any of the B1 terminals to provide ring at each phone for any of the 4 lines. I also would attached the ring generator to the RG/RB terminals on the 551C.

Are there any other connections I am missing and am I correct on the above???

I am also in need of four A/A1 controllers to allow the use of single line devices off the 1A2 and have it trip the line light.

Any help is sure appreciated!

Ron