Install the rotary unit and extend its T & R and Lamp lead to the ICM key on all the rotary sets.

Install the tone unit, and extend its T & R and Lamp lead to the ICM key on all the tone sets.

Connect the buzzer leads from the rotary unit and extend them to all the sets, both rotary and tone, according to your signalling plan.

Strap each individual signal (buzzer) lead from the rotary unit to its matching buzzer lead on the tone unit, at the MDF.

At the MDF, strap the station Lamp leads from both units together.

At the MDF, connect a 0.5 to 2.0 mFd capacitor between the Tip of both units, and a 0.5 to 2.0 mFd capacitor between the Ring of both units. Use non-polarized caps.

You can cannibalize the caps from a 400D KTU if you don't have a source.

Install the units per the practices and pay strict attention to power feed polarities!

Let us know how it works.

Arthur P. Bloom
"30 years of faithful service...15 years on hold"