Contact US

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Doorphone Controller Question - Why Does the Customer Have Three (3) DOCs?

Doorphone Controller Question - Why Does the Customer Have Three (3) DOCs?

Doorphone Controller Question - Why Does the Customer Have Three (3) DOCs?


I was wondering if I could ask a question and see what you folks think?

I have a Nortel Norstar CICS that I've maintained for years and years and years. I didn't install it, however I have maintained it since the previous Nortel dealer went under. This particular system is located on a very large estate (a "grand home" to say the least). They have Nortel T7316e phones in every location/room. They also have a gate/door phone/opener. They have a large set of gates at the front driveway that they keep closed 24x7. When I arrive (for a service appointment) I drive up to the gates, push the doorphones button, chat with security and they buzz me in. This is all handled by the Nortel CICS. So I have one doorphone and one doorphone controller. That's all simple enough - I get all of that. What I don't understand and can't figure out is why I have three (3x) doorphone controllers attached to the Nortel system? They all appear to go into the same security/gate system, but the customer can only open/close one set of gates (that's it). It's not like there is three doors or gates - just one. So then I ask myself - "is there a possible reason for the three (3) units to be setup for the same gate, but for difference purposes?" I don't know if this makes sense to anyone else? I'm just truly lost on why there would be three (3) individual doorphone controllers attached to the same system. It odd to me. I did ask the customer if they ever had more doors or gates they controlled through the Nortel system and they said "no - it's only ever just been the single set of gates at the front." So I'm lost on why these extra two (2) doorphone controllers are attached (and powered up and working). They don't appear to do anything as far as I'm concerned.... Thoughts? Any ideas or guesses would be appreciated!

Thanks so much!

RE: Doorphone Controller Question - Why Does the Customer Have Three (3) DOCs?

-Unknown Batcave entrance
-Relay to feed the shark tank
-Relay to turn on the sprinkler
-The gate is so heavy it take 3 DOC to open it

I think you need to take a closer look at the wiring for the other two, note it all down and/or take pictures then you can draw a diagram if need.
-check how many pairs of wires are connected in each DOC
-check if they are each connected to the Norstar or daisy chained to each other
-check to see what exact terminals any wires are connected too.
-check to see or see if any pairs from the DOC go to the MDF or out or the room via another cable.
-check dip switches in each one to see if they are different or exact same and what each one is set too.

Maybe the other two go to door strikes, even though no Door Phone is there.
You can also check for any hidden Door Phones by going into port status in maintenance or F9*4.

If you see connections that leave the room (might come from 24v transformer or DOC) aside from the gate then stick a toner on and go around door to door and probe around the strikes for your tone.

Outta Ammo!


Toronto, Canada

Add me to LinkedIN

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close