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Forums › Telecom New Zealand, XT Network, Yahoo!Xtra › Centrex phone and structured cabling patch lead requirements.


197 posts

Master Geek

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Topic # 111349 31-Oct-2012 10:14 Send private message


Can someone tell me what type of connectors the centrex phones have please. I am about to move some centrex phones from a BT wall plug environment to a structured cabling environment and would like to know what cables/adpaters will be needed.

Currently the phone have a standard BT to RJ11 (RJ12?) cable so I could get a RJ45 to BT adapter but have read that these arent the most reliable and not sure if i need a Master or a Secondary.

What I'd prefer would be a simple RJ-45 to RJ-11 (RJ-12?) cable but unsure what the Centrex phone use.

Also when Chorus come to move the lines and connect up the new builing will they install wall ports for us to then connect to the patch panel to or will they directly connect the incoming lines to our patch panel?

Thanks

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899 posts

Ultimate Geek

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Telecom NZ
  Reply # 709725 31-Oct-2012 10:39 Send private message

I would assume all your lines get terminated on your MDF / Patch Panel in your comms room.

That would either be AT&T 110 or Krone punch down blocks and then you would need hookup wire and a 110/Krone tool to patch it.  Or they would terminate into a 110, and you then inter patch that into a RJ45 outlets on your patch frame as "uplinks".  Then if the rest of your frame is RJ45 you can just use regular fly leads to patch to whatever outlet you want.

Not sure of what Centrex phones are as I am not an analogue guy and only did some MDF patching in a past life so talking from that experience.  But I would be surprised if they weren't using the standard pin 4/5 pair.  Then you can use RJ45 to RJ11 fly leeds to patch from the wall outlet directly into the Centrex phone.

Last time I checked a Centrex phone isn't anything more different than a standard POTS analogue phone, with the cleverness being configured in the NEAX switch at the exchange.  But I could be wrong there.




I work for Telecom, but as always my views are my own.



197 posts

Master Geek

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  Reply # 709760 31-Oct-2012 11:48 Send private message

plambrechtsen: I would assume all your lines get terminated on your MDF / Patch Panel in your comms room.

That would either be AT&T 110 or Krone punch down blocks and then you would need hookup wire and a 110/Krone tool to patch it.  Or they would terminate into a 110, and you then inter patch that into a RJ45 outlets on your patch frame as "uplinks".  Then if the rest of your frame is RJ45 you can just use regular fly leads to patch to whatever outlet you want.

Not sure of what Centrex phones are as I am not an analogue guy and only did some MDF patching in a past life so talking from that experience.  But I would be surprised if they weren't using the standard pin 4/5 pair.  Then you can use RJ45 to RJ11 fly leeds to patch from the wall outlet directly into the Centrex phone.

Last time I checked a Centrex phone isn't anything more different than a standard POTS analogue phone, with the cleverness being configured in the NEAX switch at the exchange.  But I could be wrong there.


thanks for that - I haven't been to site and have only just received photos of the comms room. looks like there is no voice panel in the cabinet only RJ-45 Cat5e panels to the wall ports. So I'd guess that the centrex lines will need to be terminated in wall mounted ports? which I will then need to patch from those to the appropriate wall port with a ?? to RJ-45  patch lead.

anyone have any idea if this is the way that chorus will terminate the lines and if so what type of connector they will use at the wall port to I can get the necessary patch leads?

16713 posts

Uber Geek

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Biddle Corp
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  Reply # 709761 31-Oct-2012 11:49 Send private message

A Centrex line is just a standard copper POTS line (but can be delivered over ISDN). The phones are regular 2 wire phones using the standard 4/5 pair.

Any standard RJ45 -> RJ11 connector will work. These all typically use pins 3 and 6 as well so will also work with digital phones that use 2 pair.




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899 posts

Ultimate Geek

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Telecom NZ
  Reply # 709774 31-Oct-2012 12:03 Send private message

dimsim: thanks for that - I haven't been to site and have only just received photos of the comms room. looks like there is no voice panel in the cabinet only RJ-45 Cat5e panels to the wall ports. So I'd guess that the centrex lines will need to be terminated in wall mounted ports? which I will then need to patch from those to the appropriate wall port with a ?? to RJ-45  patch lead.

anyone have any idea if this is the way that chorus will terminate the lines and if so what type of connector they will use at the wall port to I can get the necessary patch leads?


My bet would be they would terminate onto whatever you have on the frame :)

If you had a 110 biscuit that is normally where they would have the tie lines come in off the street onto.  Depending on the size of the building.
Then you just need to find a 1 or 2 U 24/48 port RJ45 patch frame and hookup the 110 to the RJ45 frame as incoming CO lines.

As I said before after that you will then have an easy way to re-patch all your incoming lines to any outlet in your building.  It also means you can easily test each each Centrex line at the panel.

They also make a single pair 110 to RJ45 patch fly leads.. but they are kinda nasty as they are a single pair and do tend to fall out if you brush past them.  Also it gets ugly when the frame grows.  Much easier to take the 110 or Krone punch down block and hard wire them into RJ45 "Inbound CO" patches.. then just RJ45-RJ45 patch from there on the main frame.




I work for Telecom, but as always my views are my own.

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