sundance-communications.com/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems 1a2 Project--Beginning Stages

Each room has a phone hooked to the PBX. What I plan to do is have about 4 or 5 1a2 stations, simply utilizing the 'lines' of the PBX extensions for COs. So lets say my kitchen is x101 and I also have it wired to the 1a2. If I have a call director in my office I could use 101 from there, too, and so on.

Yes you could, but you would have to wire the single line phone (ext. 101) to be "A-Lead Control". What that means is the set has to be able to provide a closure on a second pair of wires.

What happens is a call comes in on ext. 101. The bell rings on one or more phones (the kitchen and/or the 1A2 set). The lamp associated with line 101 flashes on the key set. If the line is answered on the (single line) kitchen phone then if there is no A lead control on that phone then the line will continue to ring on the key set and the lamp will continue to flash. If there is A lead control then when the single line phone answers then the bell will stop ringing on the key set and the lamp will go steady.

If there is no A lead control then lines on the key set will go on hold at the wrong times and nothing will work properly. Essentially every single phone which appears on a key set has to be set up for A lead control. It's not hard - assuming the set can handle it. Standard 500/2500/554/2554 sets can do it easily and you need at least 4 wires running to each set.

Does that make sense?


Sam

What you could do is use the PBX to provide both 'trunks' to the 1A2, and intercom.

I.e. on a 5-line 1A2 set,
Thus on line 5 you have intercom service between 1A2 stations without having to install an intercom unit on the 1A2. You can also private transfer calls off the 1A2 shared lines, eg on Line 1 (PBX101) recall/hookflash, transfer to PBX212, and the call is transferred to the kitchen, and PBX101 is now free for more incoming calls.

Most PBX allow hotline dialling, so if you have line 10 = PBX 250, and you go onhook on PBX 250, the PBX will hotline autodial any number you want. Thus you can give the appearance of tie-lines on your 1A2 to exotic places (and have one-touch autodialling on a rotary-only 1A2).