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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!
Will G.
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Joined: May 2011
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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
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Joined: Sep 2006
Posts: 3,290
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Joined: Sep 2006
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The long metal component says "Danger high pressure, do not open 337A WE" It's a relay. The " -49 " (a color suffix) in the part number means "light olive gray" referring to the plastic cover.
Arthur P. Bloom
"30 years of faithful service...15 years on hold"
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Joined: May 2007
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Moderator-1A2, Cabling
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Moderator-1A2, Cabling
Joined: May 2007
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So it's like a Wheelock for a Comkey.
Thanks, Arthur!
Your knowledge is encyclopediac.....
Sam
"Where are we going and why are we in this hand basket?"
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Joined: Sep 2006
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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.
Arthur P. Bloom
"30 years of faithful service...15 years on hold"
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Joined: Sep 2006
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Arthur P. Bloom
"30 years of faithful service...15 years on hold"
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Joined: May 2011
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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.
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Joined: May 2007
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Moderator-1A2, Cabling
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Moderator-1A2, Cabling
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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
"Where are we going and why are we in this hand basket?"
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Joined: May 2011
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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.
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