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Joined: Oct 2010
Posts: 250
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Joined: Oct 2010
Posts: 250 |
Thanks to all who replied. Skip, you made me dust off the "little gray cells" when you mentioned "bell tap" and "bias spring"
Forty six years and still fascinated with Telecommunications!
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Visit Atcom to get started with your new business VoIP phone system ASAP
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Joined: Oct 2010
Posts: 250
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Joined: Oct 2010
Posts: 250 |
I have an old 500dm in beige free for the taking. I hate to send it to the junk pile.
Forty six years and still fascinated with Telecommunications!
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Joined: Oct 2010
Posts: 250
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Joined: Oct 2010
Posts: 250 |
Is a B2AL list 1 or 2 ringer compatible to a C4A, assuming we got the part numbers correct.
Forty six years and still fascinated with Telecommunications!
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Joined: Dec 2002
Posts: 9,423 Likes: 1
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Joined: Dec 2002
Posts: 9,423 Likes: 1 |
Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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Joined: Mar 2011
Posts: 5
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OP
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Joined: Mar 2011
Posts: 5 |
A Quick Update - Yes, reverse polarity was the issue. The customer was technical enough to reverse the wiring. Thank you so much for your help. I've ordered several polarity guards and will take your recommendations. Thanks to all. Best Wishes!
Brian
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Joined: Dec 2007
Posts: 908
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Well it looks like Ive taken all I can stand so I must say goodbye.
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Joined: Oct 2010
Posts: 250
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Joined: Oct 2010
Posts: 250 |
I found a home for the 500DM rotary desk set. Thanks to all who pm'd me.
Also, for what it is worth; When we installed an old pre polarity guard TT phone we found that when the T and R were reversed and you held the hand set receiver to your ear you would not hear any TT's as you pushed the buttons and of course you couldn't break dial tone. If the line polarity was correct and you’re heard the TT's but couldn't break dial tone then our friends at Telco hadn't translated the line for TT.
Forty six years and still fascinated with Telecommunications!
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Joined: Jan 2005
Posts: 15,378 Likes: 13
Moderator-Vertical, Vodavi, 1A2, Outside Wire
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
Joined: Jan 2005
Posts: 15,378 Likes: 13 |
Don't forget that a diode was often installed in rotary dial sets behind key strips. This was so that the phone could be restricted from making outgoing calls on reversed CO lines, but still allowed the phone to dial on intercom calls.
Ed Vaughn, MBSWWYPBX
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