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I've had a 1A2 system at home for many years. It's been modified with a circuit replacing the 400E card so non-A lead phones can be used and provide off hook status. Hold is kind of reversed, line 5 is converted to a momentary pushbutton and a couple of leads are moved. It has a Melco intercom, pressing 9 gets the CO line. Previous circuits had a line isolation transformer and used A battery, but I no longer use the original Elgin power supply. It's quite basic - pressing 9 sends a momentary +24 to the circuit. I'm going to attempt to insert a link to the schematic, sorry if it doesn't work. I'm not sure if I should chose "Insert an image' or 'Create a link to a webpage' - - The 'Dial 9 acess' link appears to work.

Dial 9 access


Last edited by Keyset6; 12/19/13 05:16 PM.
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[Linked Image from i.imgur.com]


Jeff Moss

Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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Thanks for posting the actual file! Please let me know how you did that.

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Saved your picture to my computer, uploaded it to imgur, then posted the link smile


Jeff Moss

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Ok - at some point I'll post the line status and hold schematics. I now refer to the former A lead as the H lead, + present when pressing the hold key while going on hook. The line in use indicator is a basic opto-isolator circuit, hold is 2 relays. From what I read about 1A1 systems the hold circuit may be based on that, also very basic. I now use the doorbell transformer to power the lamps. It's 18vac, so there's 2 diodes in series to drop it a little. Yes the lamps will dim when both the CO and intercom are in use. There is no longer a bathroom phone, but do like being able to pickup in the garage and cordless phone. I don't have my basic caveman cellphone on me when I'm home. I much prefer talking on tip & ring.

I just read AT&T is selling out all landline facilities in my state to another company, Frontier. I hate to do it but looking at Frontier's rates I may need to finally retire my analog CO line and consider voip, but would want an analog adapter for the key system. Quite a few choices available, will need to do some research.

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Tiny topic detour...I never understood why SBC wanted to buy SNET. The northeast was primarily Verizon territory and that meant that SBC was isolated. That didn't change when SBC bought out AT&T.


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In terms of ATAs, I use the Cisco 186. Awesome little device that lets you customize just about everything, including the ring cadence and the region of the ringback and other tones. My one problem with it is that it puts the caller ID name in quotes.

Like this:

"Cell Phone Wa"
1-360-555-1234

If you are considering an ATA the Cisco model does provide two ports, so two CO lines on the KSU. Also, check out CallCentric for VoIP service. I pay just shy of $15/mo for my local Oak Harbor, Washington DID # and 500 minutes to any North American number.


Tennessee Technology Solutions, LLC | "Business technology solutions reimagined." | (423) 665-9995 | www.423tech.com
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Thanks for the VoIP/ATA information. When you mention the caller ID is in quotes - that's how it's displayed on a Caller ID built into a phone or standalone unit?

Even if I didn't have the CO line I'd have the key system. Now that school is out for the year someone is here at times so the intercom is used as a typical intercom again. Also use it to control other circuits for lights. Although I don't use the remote function much now, I'm able to call the answering system via the intercom and access it remotely. There's a lot that can be done with the Melco intercom. I may have one more if it fails, otherwise I may need to convert a couple more line keys for other functions.

The VoIP using an ATA is all new to me, sort of. Had a Magic Jack several years ago connected to line 2 of the key system (formerly a CO line for voice and internet dial-up). It actually wasn't bad at all - at the time I had DSL and several others could be doing things online so the audio could get choppy. With the current cable internet and it's usage that's not a concern. Whatever I get will be used with the 1A2 system. The only ringer load will be an electronic phone. That phone's tone ringer is fed into a paging amplifier.

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The caller ID name shows in quotations no matter what device is receiving the data. Right now, it's a Partner 34D set on my Partner ACS system.

On Magic Jack you won't get the CO line disconnect signal that will release a held line on your KSU. That's what sucks about it.


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Disconnect supervision would be good.

I'm going to attempt to post the CO off hook and hold circuit using Jeff M's method. At the time I didn't have an electronic template for Power Point so the schematic has components drawn from shapes.

This allows using any analog phone on the system. I have a couple 2564 keyfields in a small wood enclosure with a modern speakerphone on top. When the line is idle the 48v turns the optoisolator on, sending a ground to the transistor keeping it off. When a phone is off hook there's not enough voltage to activate the optoisolator. That allows the transistor to activate via the 47k resistor as there's no longer a ground through the 390 ohm resistor. The CO seems to reverse T&R during the ring cycle - the lamp will remain on between ring cycles. I could have made a bridge rectifier, but the answering system will pick up on the second ring.

(Thanks Jeff, using preview it appears the image will display)

[Linked Image from i.imgur.com]


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