I stumbled upon this little device today, and since it was Bell System, decided it needed a place in my collection.

Any ideas what it was designed to do?

Front
[img]https://www.flickr.com/photos/phone-man/7027719315/[/img]

Back of unit
[img]https://www.flickr.com/photos/phone-man/6881621064/[/img]

The long metal component says "Danger high pressure, do not open 337A WE"

Any Ideas?

Since the images didn't seem to load, go to my Flickr page to see them
www.flickr.com/photos/phone-man

Sorry for any inconvenience!

7A Communications System * Com-Key * 718 Key Telephone System

22A -49 Apparatus Unit is an external signaling circuit that activates a signaling device which is external to the telephone sets. O22A -49 Apparatus Unit offers a contact closure or opens a contact as required to operate KS-16301 type signaling devices (Section 463-110-100) or other external alerting devices.

This unit is 1-13/16 deep by 2-3/4 inches high by 4-3/8 inches long and is wall mounted externally to the 570-type KSU. Connections are made on six screw terminals.

The 22A -49 Apparatus Unit may be used to activate an external signaling device for:
*Common Audible
*Station Codes
*CO/PBX Ringing
*Ring Transfer

It's a relay.

The " -49 " (a color suffix) in the part number means "light olive gray" referring to the plastic cover.

So it's like a Wheelock for a Comkey.

Thanks, Arthur!

Your knowledge is encyclopediac.....

Sam

Thanks, Sam, although 355A was the person who posted the BSP reference.

This unit, unlike the Wheelock family of generator-driven auxiliary relays, uses (I believe) other low-voltage signals to do the same tasks. I believe that the "turkey tone" audible signal, or maybe a ground, is used to activate it, but I have not seen the BSP in 25 years so I can't be sure.

Please delete

The information regarding the 22A apparatus unit was extracted from the third volume of the Key Systems (ComKey) Service Manual.
Perhaps a scanned version is available in the TCI Library or from Sam Etler or one of the other scan contributors.

Thank you WECo 355A! My apologies. I'm so used to Arthur coming up with the obscure WE info....

I never worked for Bell so my knowledge of WE proprietary products is somewhat limited.

Arthur - Yea, I realize that it wasn't using Ring Generator, just that it provided the same functionality.

Sam

From the TCI Library-

518-450-102 i4 Feb81 14A Communication System ~ Comkey 1434 Identification, Installation, Connection, Operation and Maintenance. 21MB. Issue 4, February 1981, 236 pages. Contributed by Sam Etler.

https://tinyurl.com/7u73kbs

Connection details for the 22A are shown on pages 53 to 57.

Thanks for the info!

It came out of a factory, so it makes sense they would need some type of signalling system for a noisy environment.

WECo, thanks for the link to the PDF, I don't think I have that one in my PDF library of BSP's.

Thanks again for the help!