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Rewiring of PBX system to accomodate dsl on POTS line.

Posted on 2004-04-01
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Last Modified: 2013-12-27
Hey guys,

I'm switching over 1 line of a telephone system in a business that has a pbx system to provide adsl service.  I was wondering if instead of running a telephone wire to the fax (that is sharing the line with the dsl), if i could splice into the connectors next to the pbx system  so I don't have to run another wire.  BTW- this line won't be connected to the PBX.  Thanks.

mados
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Question by:mados123
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4 Comments
 
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Expert Comment

by:HippyWarlock
ID: 10740741
My response, without researching, and if I am correctly interpreting your intentions, is that if you are not going to use this line and its wiring redundant, then go ahead and 'splice it and see' - If the cable or your splice is 'poor' then you will have to run another cable, but you have lost nothing in the process (apart from 10 minutes of fiddling).

Both POTS and ADSL use twisted pair copper for the final mile so I would assume a fair chance they have some degree of compatibility?

NOTE: BT states that PBX lines are not compatible with ADSL - But then gain BT would freak if it saw how my converted RJ45 cabling was thrown into my ADSL line, However I am not a business and do not care if it packs up on me.

Just ensure the PBX line you are going to use will NOT plug itself back into the PBX system in any way shape or form.
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Author Comment

by:mados123
ID: 10744600
First of all, hippy, thanks for your prompt response.  Considering my lack of knowledge relating to PBX systems (and the lack of manuals available on the web), I am having a hard time recognizing which set of wires run from the last junction of wires to the fax .  Is there a simple way to identify the line without specialized tools?  Also I'm not sure what is meant by wiring redundant.  What does that mean?  I do understand your suggestion of making sure it does not run back into the pbx system.  Thanks for all of your help.

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Accepted Solution

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HippyWarlock earned 250 total points
ID: 10747606
By redundant I mean the wires won't be used by the PBX system.

As for the fax wires. A simple bell tester will alow you to ring out the wiring (again ensure the wiring is isolated from the rest of the PBX system fiirst)

There are a couple of tech issues that may affect your finished layout.

1. Unterminated ends on wires can cause (will cause) reflection noise. This can adversely affect the PBX system <can I add that I don't know how tolerant the PBX you are using is to this affect> so if your PBX wiring is daisy-chained (looped) ensure you terminate in accordance with your PBX systems requirements.

2. Mismatch of impedance due to different wiring standards, I think this unlikely in your case.

Thinking on.... How exactly where you plannin to do this? Feel free to annotate my ASCII art line drawing below:

ADSL IN >---->---->USB MODEM>----->------>PC


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Author Comment

by:mados123
ID: 10774525
Current setup
Allegiance Telecom
VOICE & DATA W/ FRACTIONAL T1>----->----->GATEWAY/HUB>----->WORKSTATIONS & SERVER
     |
     |>----->PBX>----->TELEPHONES & FAX MACHINE

Future Setup
Allegiance Telecom
VOICE>----->PBX>----->TELEPHONES
Verizon
POTS LINE>----->----->ADSL>----->----->GATEWAY/HUB>----->WORKSTATIONS & SERVER
     |
     |>----->FAX MACHINE

Thanks again for your input.
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