Hello all. After setting aside my 1A2 project for a few months I've started working on it again. Today, I'm trying to figure out how to integrate a 118A frequency generator into my 551A shoebox KSU. I have the ring generator temporarily zip tied to the Interrupter.

[Linked Image from phase2.us]

I connected the ring generator to RG/RB on the 66B5 block inside the 551A KSU.

[Linked Image from phase2.us]

Upon consulting Practice Section 518-215-407 , clause 2.03(c), 3rd bullet point under Replaceable (Optional) Components, I note that 551A KSU is conspicuous by its absence in the following clause:
Quote
Generator, Frequency 118A-for use with
550B, 550C, 551B, and 551C KSUs; 105-volt ac
ringing supply (supplied with three mounting
screws)
Moreover, Fig. 10 states, in the bottom right hand corner
Quote
TO 118A FREQUENCY
GENERATOR
RG (B KSU ONLY) OR
EXTERNAL RINGING
SUPPLY
QUESTION: Can a ring generator be used with my 551A KSU for common audible? If yes, any thoughts or comments to move me in the right direction?

I'm no phone man; just a hobbyist who happened to take an electronics class in 8th grade which isn't much of a foundation. Worse, I'm a hobbyist who has yet to master wire fishing in the walls of my house (but that's a mess for another post). But, this leisure time project is fun to me and your advise throughout this board has made my hobby possible.

Here's one last photo showing my 1A2 project in process:
[Linked Image from phase2.us]

Thanks in advance,

Mark

PS: Please type slowly as I'm not a fast reader.

Mark