Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

23 posts


# 20448 26-Mar-2008 21:33
Send private message

Ez Crew,heres my problem I need to install a new phone jack in my room,I have a 2 wire extention pack and relized about the older 3 wire jacks from the inscrutions.So had a look around my house to see what I had.Now in the lounge under where the sky areial comes in theres a 2 wire jack but in the hall way I have a 3 wire jack with M on it(i know this is the master).Now from what I have read these two types should'nt be mixed and I need to replace the older 3 wire with a two wire jack.So can I just use the exsiting wires going into the 3 wire jack or do i need to replace the old wiring with new 2 wire?. I would like to run my new extention from this hallway postion as its closer to the room i need the new jack in or will I have to run it from the 2 wire jack in the lounge.Thanks

Create new topic
6964 posts

Uber Geek


  # 119481 29-Mar-2008 09:20
Send private message

Hi, technically there is no reason is no reason why you cannot mix 2 and 3wire jacks, although a 3wire Slave jack on a 2Wire system will not ring the bells, hence for this and a few other reasonsTelecom made the mandate not to mix standards. As you can see the 2Wire jack keeps you Sky box happy. Because you are now wanting to add another wire to the back of the Master jack the need to upgrade it to a 2Wire jack makes good sense.

In a two wire jack there are two rows of IDC headers, each row normally has 3 positions in it. Each row is one leg of the phone circuit and each of those 3positions are all wired together. Therefore you can have several lines tapped off a jack with each line having its own IDC slot, which is important if you have lines with different gauge copper. So I recommend you replace the M 3Wire with a 2Wire to ease wiring.

The inbound line to the master jack has 2wires, thats all there is, so get another 2Wire jack and wire that to the inbound line, use the cable in the extention kit and wire it to the 2nd 2Wire jack in your bedroom, and do the same to the cable running to the Sky jack.


2997 posts

Uber Geek

  # 119513 29-Mar-2008 12:48
Send private message

In residential situations the old 3 wire jacks didn't have great reliability. Damp air mixed with DC potential equals corrosion. The later jacks had changes to the circuit board layout and protective coating to reduce this problem. Old jacks that haven't failed yet are running on borrowed time.


23 posts


  # 119742 30-Mar-2008 20:47
Send private message

Thanks Cyril7 & Bung,I have changed the old 3 wire jack to a 2 wire and run the extenion into my room so far its seems to work fine,i have a weekly internet radio show that runs for two hours and did my show with no problems/no drop outs,so thats good.The only thing I thought was strange,was that I had to couple two of the same wires into the same slot.I'm talking about the existing wires that ran into the 3 wire jack.The wiring had four wires all up,Two white two black(red on the inside),one white by its self one black by its self and then white and black that had been connected togther into some plastic connection.At first I ran just the black into the number 2 slot & white into 5,pluged the phone in but had no dial tone so then ran the black & white that was connected together also into the number 5 slot,pluged in the phone and had a dial tone,pluged my modem and had the internet running.So left this as is with no problems,it also stoped the bell ringing in the hall way which I wanted any way.Will this configration cause any prolems?Seems to be ok so far......

Create new topic

Twitter and LinkedIn »

Follow us to receive Twitter updates when new discussions are posted in our forums:

Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:

Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:

News »

Microsoft New Zealand Partner Awards results
Posted 18-Oct-2019 10:18

Logitech introduces new Made for Google keyboard and mouse devices
Posted 16-Oct-2019 13:36

MATTR launches to accelerate decentralised identity
Posted 16-Oct-2019 10:28

Vodafone X-Squad powers up for customers
Posted 16-Oct-2019 08:15

D Link ANZ launches EXO Smart Mesh Wi Fi Routers with McAfee protection
Posted 15-Oct-2019 11:31

Major Japanese retailer partners with smart New Zealand technology IMAGR
Posted 14-Oct-2019 10:29

Ola pioneers one-time passcode feature to fight rideshare fraud
Posted 14-Oct-2019 10:24

Spark Sport new home of NZC matches from 2020
Posted 10-Oct-2019 09:59

Meet Nola, Noel Leeming's new digital employee
Posted 4-Oct-2019 08:07

Registrations for Sprout Accelerator open for 2020 season
Posted 4-Oct-2019 08:02

Teletrac Navman welcomes AI tech leader Jens Meggers as new President
Posted 4-Oct-2019 07:41

Vodafone makes voice of 4G (VoLTE) official
Posted 4-Oct-2019 07:36

2degrees Reaches Milestone of 100,000 Broadband Customers
Posted 1-Oct-2019 09:17

Nokia 1 Plus available in New Zealand from 2nd October
Posted 30-Sep-2019 17:46

Ola integrates Apple Pay as payment method in New Zealand
Posted 25-Sep-2019 09:51

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.