sundance-communications.com/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems Help with MELCO 266A Flashing Lamp Unit

I am installing a Melco 266A Flashing Lamp Unit in my ITT K501A which is also equipped with a Melco KC-19 Intercom. It is fairly straight forward except for one hitch:
The Melco practice says to connect the "NR" on the unit to "interrupted audible signal supply".
Which one is this on the 501? My interrupter options are: BZ,BZ1,RN,ST,LF,LW,LF and LW. I know what most of the codes stand for but am not sure of all. I am using low voltage buzzers for ICM station signaling and Ring Battery for the CO lines. I don't want to inadvertently connect 105V ring bat to the M226A.
Any help would be appreciated. I have the 501 practice and my best guess (which may be worthless) is to connect the NR on the M266A to BZ1 of the 501.
Thank you for any help.
Al

The "N" in "RN" means "iNterrupted." And yes, it's interrupted ringing. So, if you want interrupted buzzer supply, either you need to change the input to the interrupter from GEN to 18Vac, or add a relay that follows the RN and use it to send interrupted 18Vac to the intercom unit.

I will research what the BZ and BZ1 outputs are, when I get back to my books. In the meantime, you could do a search for the 551 KSU in the TCI library.

I meant to type 501 KSU but the old timeout edit thing got me.

Thank you Arthur. I will switch the leads to 18Vac. I have other ways (key systems) to ring the lines with the ring bat. I will also look up the 501 on TCI and see if it is same practice I have or a different one.
Have a nice evening.
Al

Would BZ be buzzer?

YZ, it WLD.

"LF" is an interrupted 10VAC output that provides and even on/off at 60 FPM. "RN" is a +/- 105 VAC output that provides about two seconds of ring battery with a four second pause in cadence.

Either one requires that a ground be placed upon the "ST" lead for the duration of time that this signaling is required. When this ground is removed, the interrupter will continue to run until the end of its cycle.

"LF" as mentioned above is "Lamp Flash".
"LW" is the faster "Lamp Wink" use for lines on Hold

The RN on central office lines is 2 seconds on, 4 seconds off, for a total of 10 rings per minute.

On PBX and key system interrupters, the cadence is faster: 1 second on, three seconds off. The theory being that business calls need to be answered faster. It was not entirely an altruistic gesture on the part of Mother; she realized that an answered call is a call that makes money, so it was in Her best interest to get the call to sound more urgent, and therefore get answered more quickly.

An employee who was told to answer by the fourth ring was actually answering the call before the calling party had heard three rings, helping to avoid an abandoned call and a disappointed caller.

An abandoned call used electricity, and created wear & tear on switching equipment, without the off-setting revenue. It wasn't all about dollars with Mother, it was about hundredths of pennies, which added up.

Thank you everyone for all your help.