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Joined: Dec 2002
Posts: 9,429 Likes: 3
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Joined: Dec 2002
Posts: 9,429 Likes: 3 |
I've been reading these posts pretty much every time I see something new. It's very interesting and I'm learning a lot too!
Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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Joined: Dec 2005
Posts: 7,056
RIP Moderator-Mitel, Panasonic
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RIP Moderator-Mitel, Panasonic
Joined: Dec 2005
Posts: 7,056 |
Too bad it's all for naught. 1A2 WAS an interesting system that is bullet-proof, but finding 1 in operation is pretty much astounding, these days. Well, at least in a commercial application.  John C.
When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
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Joined: Sep 2007
Posts: 741
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Joined: Sep 2007
Posts: 741 |
John -
Based on your comments about adding a bridge rectifier, can I assume you have some knowledge of circuit design?
I need a way to introduce an adjustable delay between the time my homemade A lead control (MHALC) senses T&R current and the time it closes the relay contacts.
Just curious...
Thx
Matt
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Joined: Sep 2006
Posts: 3,290
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Joined: Sep 2006
Posts: 3,290 |
REMOTE HOLD!!! Arrrrgh!
Remote hold using 1A1 or 1A2 was bad enough (before the advent of the SanBar card or the Teltone 487)
Try installing remote hold using 1A equipment with flashing line lamps, if you want a challenge that will make your gums bleed. I did it once, and have never been the same since.
Arthur P. Bloom
"30 years of faithful service...15 years on hold"
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Joined: Sep 2007
Posts: 741
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Posts: 741 |
What is remote hold? I didn't want to send Sam over the edge, so I didn't ask before...
But now I must know.....
Oh yeah - one other advantage with my kludgy A1 control - I can tell if someone is talking on an SLT or a keyset. W00t!
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Joined: Dec 2005
Posts: 7,056
RIP Moderator-Mitel, Panasonic
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RIP Moderator-Mitel, Panasonic
Joined: Dec 2005
Posts: 7,056 |
Matt, Closes the relay contacts, or Opens the relay contacts? John C.
When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
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Joined: Sep 2007
Posts: 741
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Closes - It's N/O till it senses current on T & R.
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Joined: Sep 2007
Posts: 741
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Hey John -
Was walking the dog and it occured to me what you were really asking.
I think what's happening is that the relay is closing before T&R are established; if I've read the replies here properly it has to go T&R followed very closely by A/A1.
So I was thinking I need an adjustable delay between the time the circuit detects T&R and then closes the relay.
I'm probably worng though.... I'm pretty good at that.
Thanks
Matt
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Joined: Jan 2005
Posts: 15,390 Likes: 14
Moderator-Vertical, Vodavi, 1A2, Outside Wire
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
Joined: Jan 2005
Posts: 15,390 Likes: 14 |
The A leads must close before the Tip and Ring contacts when going off-hook. The A leads must open AFTER the tip and ring contacts when going on-hook.
Ed Vaughn, MBSWWYPBX
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Joined: Sep 2007
Posts: 741
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Oh. Well, I knew I'd get it wrong - thanks Ed!!
Gives me an idea....
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