Return to the Electrical Wiring Forum | Post a Follow-Up

 o
Adding a 2nd phone line

Posted by PhilPense (My Page) on
Thu, May 19, 11 at 14:40

Checked the phone wiring access box expecting two sets of red/green, black/yellow wires. Images are posted to:

http://cid-63220807a7f4accb.photos.live.com/browse.aspx/Phone Junction Box

Instead I have found four sets of black/yellow wires. Would want to add a second phone with its own phone number. How can I determine which of the black/yellow wires is for my phone line. I know that a phone tech can be sent out but this is my opportunity to learn about phone wiring. Looking for informed guidance

Here is a link that might be useful: Phone Cable Box


Follow-Up Postings:

 o
RE: Adding a 2nd phone line

You need to identify which of these wires goes to the outside phone connection (if any). This is an unholy mess that appears to have been done by some unskilled person. Is that a piece of electrical NM cable sliced with wirenuts. Is this really an air plenum. There's serious code issues here.

You know how the 66 block works? each row of pins has three on the left that are all connected together and three on the right. A few of yours have "bridge clips" to connect the left side to the right.

A line tracer, or even a butt set would help, but you can take a regular phone and a unused phone jack to make your own test set. Get some wires with aligator clips and connect one to the red/green wires on the phone jack and then you can try connecting it to the various pairs available. If you get a dial tone, you can call your cell phone or something to figure out which line you've hit.


 o
RE: Adding a 2nd phone line

It's pretty hard to tell from the pictures exactly what you have, other than a mess. Are these 66 blocks in a residence? Whoever connected the wires to them obviously didn't have a punch down tool (designed for this block).

In a 4-wire telephone cable, you typically use the red/green pair for the first line, and then yellow/black pair for the second line. Given that there are 66 blocks, usually you have 25-pair cables attached to those and then the first line is white/blue (a white wire with blue stripes, and a blue wire with white stripes), and the second pair is white/orange.

If possible, I'd start by making a diagram of all the jacks and cables, and which ones connect to where. Most of what I see in the pictures indicate that you're only using a single pair of wires from each cable.

If you come back with a diagram, we may be able to provide more assistance.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Electrical Wiring Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here