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RJ45 for Phone Line

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Buck Turgidson

Jan 1, 1970
0
I have a jack in my bedroom where I want to run both an ethernet connection
and a phone line. I have a modular jack and I can only find RJ45 connectors
for it.

Can I use an RJ45 connector for the phone line using regular phone cable
that I bought at Home Depot? Any details would be appreciated.
 
I

Isaac Wingfield

Jan 1, 1970
0
Buck Turgidson said:
I have a jack in my bedroom where I want to run both an ethernet connection
and a phone line. I have a modular jack and I can only find RJ45 connectors
for it.

Can I use an RJ45 connector for the phone line using regular phone cable
that I bought at Home Depot? Any details would be appreciated.

Yes. It was intended to be used that way.

Use the middle four connections (3, 4, 5, 6) just as you would the four
connections of an RJ-11 (1, 2, 3, 4). An RJ-11 plug will fit right in,
and work just fine.

You can use the other two pairs (1,2, 7,8) for ethernet at the same
time, if you use an adapter to move the signals to the appropriate pins.
(1, 2) should go to the same pins; (7, 8) moves to (3, 6).

Isaac
 
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Geoffrey S. Mendelson

Jan 1, 1970
0
Yes. It was intended to be used that way.

Doing so will damage the jack. The best thing to do is to make an RJ-45 plug
to Rj-11 plug patch cable wired as above.

Geoff.
 
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Bennett Price

Jan 1, 1970
0
Geoffrey said:
Doing so will damage the jack. The best thing to do is to make an RJ-45 plug
to Rj-11 plug patch cable wired as above.

Geoff.
.... and don't use regular phone wire for ethernet. Buy special (CAT 5)
cable for Ethernet. (Cat 5 cable can be used for plain old telephone if
you wish.)
 
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petrus bitbyter

Jan 1, 1970
0
Buck Turgidson said:
I have a jack in my bedroom where I want to run both an ethernet connection
and a phone line. I have a modular jack and I can only find RJ45 connectors
for it.

Can I use an RJ45 connector for the phone line using regular phone cable
that I bought at Home Depot? Any details would be appreciated.

First: RJ45 is a well defined standard in a telco environment. It describes
signal names and wires used on a 8p8c minimodular plug/jack. So using the
name RJ45 in an network environment is misleading. It is about the same
common error like using RS232 for a DB25 or DB9 connector.

Then: Wiring the 8p8c connectors for ethernet is deliberatly "standardised"
on using the pins 1, 2, 3 and 6. By plugging a ethernet cable into a
telephone outlet you avoid to connect it to the wires of the pins 4 and 5
which can carry pretty high telephone voltages, fatal for ethernet
equipment.

Wiring one 8p8c outlet for both telephone and ethernet can be done but you
have to use cat 5 UTP cable, at least fot the ethernet part. You can use the
same cable for telephone if you wish, but you can't use plain telephone
cable for the ethernet part. Not reliably.

Somewhere outside the outlet you have to split the cable. Where I live they
are for sale in any DIY shop where it is named ISDN splitter.

petrus bitbyter
 
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