sundance-communications.com/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems Speed Dial Secreterial Telephone with RJ45 Connector

Hello everybody!

I found this really awesome telephone at a flea market, but I don't know how to set it up.

It's a handsfree, 32 station Panasonic RX-T1225D easa-phone speedialer, which has an RJ45 connector on the end.

So I was thinking it would as easy as 1,2,3, so I crimped an RJ12 connector on the cable (not that I have three lines, but what the hell), and I connect to the CO fine, but it seems the telephone incorportaed an external microphone, because although I can dial out, and I can hear the other party, they can't hear me!

I opened the case, and I can't see an internal microphone anywhere, so I'm guessing that one of the pair from the 4 pair connector cable was to attach to an external mic.

The pairs are as follows: Green/Red; Yellow/Black; Orange/Blue; and Grey/Brown.

It would be an easy mod to connect one pair to a female mono plug for an external mic IF that's what is the problem.

Can anyone lend a hand?

Thanks a lot guys!

The 8-pin plug was arranged to plug into an RJ31X 'ancillary device' jack, sometimes called a 'dialer jack'. Tip and Ring come in on pins 4 and 5 from the C.O. and go out on pins 1 and 8 to the telephone set. The speaker is strictly to monitor call progress, then when you pick up the telephone handset, the dialer senses the 'off-hook' condition of the telephone and connects the line through to the phone, turns off the speaker and goes back to idle condition. Hopefully, you can still dig the plug out of the trash so you can see how to wire the NEW 8 pin plug onto the end of the cable. If not, best guess is red and green on pins 4 and 5 respectively, slate and brown on pins 1 and 8 respectively.

Oh, and about "RJ45 Connector", RJ45 designates a specific 'phone jack' wiring scheme that has to do with, as I recall, dedicated 56K circuits. RJ30 through RJ48 all start with an 8-pin jack and and wire it in some specific manner, each for some specific purpose. I believe most are obsolete now. Just a word to the wise, before the mysterious "RJ45 COP" writes you a ticket! The preferred expression is "8-pin modular plug/jack". But with 200+ posts, you should know about the "RJ45 COP".

Awesome Lightninghorse!!! Thanks a ton brother! I kept the old connector, so I can have a look at the setup.

So basically, the telephone does not have an internal microphone?

So I'm guessing pins 3/6 are for second line, and pins 2/7 are for the third line?

I'll go pop the "8-pin modular plug :rolleyes: " back on the phone.

:toast:

Actually, I believe pin 3 and 6 provided A and A1 closure on a 1A2 line to indicate line-in-use. Normally, the RJ31X was wired into the phone between the keystrip and network. In such a way that whatever line button was depressed was the line it used. 2 and 7, who knows. Maybe alternate power path to the 1225 to do away with cords all over the place?

This is an interesting link describing how the RJ31X was invented to help solve installation conflicts between home security systems and the TELCO.

https://www.hometech.com/learn/rj31x.html

OK, I need to start from the beginning here for a second. The "telephone" does not have a handset. It is a much older version of this telephone:



It has 32 speed dial positions, but why can you call out if there is no microphone!? I mean, what's the point!?

Technically, it's not a telephone. It sounds like an add-on speed dialer. These were common before speed dial became a standard feature on all phones. Radio Shack made them in a residential version. I managed to convert one of those to connect to a 2564 as mentioned in one of the above posts. Probably still around here someplace...

Vern Hobbs

Cat6, I see where I misled you a little. In my second post I should have said RJ31X "JACK". Then the 8-pin PLUG on the dialer plugs into the JACK. In order to get the maximum benefit from the dialer, there has to be a telephone wired in 'behind' the dialer. The telephone's Tip and Ring connect to pins 1 and 8 of the RJ31X. You may have seen the dual jack faceplates that have an 8-pin jack with 'shorting bars' and a standard 6-pin 4-conductor RJ12 jack. Dialer plugs into the 8-pin jack and phone plugs into 6-pin jack.

These were very cool auto dialers. They have a ONE-WAY monitor speaker built in. You press the speaker button, hear dial tone, press your speed dial button. It dials, and if your party answers, you lift the handset on your phone to talk, and the monitor speaker automatically goes off.

If you reach a Busy Signal - press the redial button while the busy signal is playing. It will wait 30 seconds, go off hook and dial the number again. If it "hears" a busy signal again, it will automatically turn off, wait, and dial again. It it doesn't get a busy, it will stay off hook for you to lift the handset and talk.

For use with a single line phone, it came with a T-adapter with a 6C2P jack for your phone, and a 8C8P jack for the dialer.

For 1A2 use, you wired it up to the common T/R and A-leads of the keystrip, so you push down the line you want to use, and let the dialer do its thing.

The jack specified for these is probably RJ13, which provides access to one T&R and the A-leads of the key system.

Lightning, as a sworn officer in the RJ Police, I am offended that you apparently do not take our duties seriously. We are the thin White/Blue line, the only thing protecting the public from the "I installed an RJ45" epidemic that is sweeping the country.