|
|
|
|
Joined: Jan 2005
Posts: 15,382 Likes: 13
Moderator-Vertical, Vodavi, 1A2, Outside Wire
|
Moderator-Vertical, Vodavi, 1A2, Outside Wire
Joined: Jan 2005
Posts: 15,382 Likes: 13 |
Nope. 18VAC was always used for buzzer signaling only, but not really much in the Bell System.
Bell companies in the United States pretty much used 10VAC for lamps, buzzers and the interrupter motor. Independent telcos using ITT, Automatic Electric and Stromberg-Carlson 1A2 (and likely others) may have used 18VAC for buzzers, but not for any significant reason.
Relays were operated with -24VDC ("B" battery). A filtered -24VDC source ("A" battery) was cleaned up enough to provide a clear talk path over manual or dial intercom systems.
DC power outputs on 1A2 were always negative, as in the ground was positive. This is the same with Ring (battery) being negative and Tip (ground) being positive on C.O. lines.
Ed Vaughn, MBSWWYPBX
|
|
|
Visit Atcom to get started with your new business VoIP phone system ASAP
Turn up is quick, painless, and can often be done same day.
Let us show you how to do VoIP right, resulting in crystal clear call quality and easy-to-use features that make everyone happy!
Proudly serving Canada from coast to coast.
|
|
|
Forums84
Topics94,326
Posts638,992
Members49,781
| |
Most Online5,661
May 23rd, 2018
|
|
|
0 members (),
79
guests, and
101
robots. |
|
Key:
Admin,
Global Mod,
Mod
|
|
|
|
|
|
