What was a WE type J1A handset used for?

[JimHyak]

I recently bought a WE 500 set on eBay with what I thought was a G5 handset, but now that I have received it, it is a J1A. The BSP 501-210-104 says it has a 1475Hz oscillator for "1 type telephone reporting sets". Pressing the button sends a tone, but what is it used for?

[unbeldi]

I think it was for special subscription services that automatically connected customer-premises equipment for alarm indications.



PS: I thought there was a section of BSPs on voice connecting arrangements, but I can't find them right now, I think I had an index at least.

[Ktownphoneco]

Karl is correct.     I was wondering what it was used for myself.     Just found this BSP information in the TCI Library. ( attached ).     Appears to be associated with a customer's alarm system equipment.    The explanation starts on the 2nd page, and the reference to the handset is in section 2.05.

Jeff Lamb

[Ktownphoneco]

Meant to mention that the previous information attached to my last message, was provided, with thanks, by the Telephone Collectors International Library.

Jeff

[paul-f]

Also, see 501-210-104-i2-Handsets-J1A in the TCI Library and

  http://www.paul-f.com/weHandsets.html#J