# RJ45 PCB Layout help

#### RodneyB

Joined Apr 28, 2012
697
I want to join 2 x RJ45 sockets in parallel on a PCB. I use proteus 8 professional and not for the life of me can I do a single sided PCB layout. I have even tried the auto router and it fails.

Any help will be greatly accepted.

#### BReeves

Joined Nov 24, 2012
410
So you want to have two PC board mount RJ-45's sitting side by side wired in parallel on a single sided PC board? Can't be done without jumpers. If I was on my other computer I could do it real quick with Express PCB.

#### RodneyB

Joined Apr 28, 2012
697
So you want to have two PC board mount RJ-45's sitting side by side wired in parallel on a single sided PC board? Can't be done without jumpers. If I was on my other computer I could do it real quick with Express PCB.
Ok I never considered jumpers I will try it now

#### AnalogKid

Joined Aug 1, 2013
8,377
It can be done easily with an S shaped routing between the two connectors. For two connectors at the right edge of the board, facing to the right (outward):

8 traces go in parallel to the 8 pins of the upper connector.
The 8 traces continue straight under the connector body, then all 8 turn 90 degrees to the right to head downward.
When they are even with the gap between the two connectors, hen they turn 90 degrees to the right to head back between the connectors toward the inside of the board.
Once past the back of the connectors, they turn 90 degrees left to go down behind the lower connector.
Then they turn 90 degrees left again and go straight to the 8 pins under the lower connector.

No jumpers, and equal average path length for all 8 signals.

ak

#### RodneyB

Joined Apr 28, 2012
697
So you want to have two PC board mount RJ-45's sitting side by side wired in parallel on a single sided PC board? Can't be done without jumpers. If I was on my other computer I could do it real quick with Express PCB.
Even with Jumpers I have failed

#### RodneyB

Joined Apr 28, 2012
697
It can be done easily with an S shaped routing between the two connectors. For two connectors at the right edge of the board, facing to the right (outward):

8 traces go in parallel to the 8 pins of the upper connector.
The 8 traces continue straight under the connector body, then all 8 turn 90 degrees to the right to head downward.
When they are even with the gap between the two connectors, hen they turn 90 degrees to the right to head back between the connectors toward the inside of the board.
Once past the back of the connectors, they turn 90 degrees left to go down behind the lower connector.
Then they turn 90 degrees left again and go straight to the 8 pins under the lower connector.

No jumpers, and equal average path length for all 8 signals.

ak
I am struggling to follow this explanation. Would you be good enough to post a sketch.

Thank you

#### mcgyvr

Joined Oct 15, 2009
5,394
Rodney,
Can you post a sketch of the desired orientation of the 2 jacks on the board?
We don't know if they are next to each other, opposing each other, one on one side and one on the other,etc...
Could be as simple as this..

#### jpanhalt

Joined Jan 18, 2008
9,085
This is one of several solutions:

John

#### mcgyvr

Joined Oct 15, 2009
5,394
In addition to seeing how you intend to place them on the board we clearly need to know if they are through hole or surface mount type..
Post the part number/datasheet

#### AnalogKid

Joined Aug 1, 2013
8,377
Single sided layout. Traces extend outside the lower connector for clarity. All traces between the two connectors are the same length.

ak

#### kubeek

Joined Sep 20, 2005
5,718
Is this for ethernet? If so, you really should keept the impedances correct, so using pairs from a CAT5 cable and short traces just to join the wires would be advisable.
Also if this is for 10/100Mbit ethernet then you likely need just four wires.

#### RodneyB

Joined Apr 28, 2012
697
In addition to seeing how you intend to place them on the board we clearly need to know if they are through hole or surface mount type..
Post the part number/datasheet
Sorry I don't have a part number But I have attached Photos of the socket. They are through hole mount I want to have them side by side

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#### RodneyB

Joined Apr 28, 2012
697
Is this for ethernet? If so, you really should keept the impedances correct, so using pairs from a CAT5 cable and short traces just to join the wires would be advisable.
Also if this is for 10/100Mbit ethernet then you likely need just four wires.
I am extending my Internet Cable to a router, My cable is 10 meters short so I just want to make a link with the sockets

#### RodneyB

Joined Apr 28, 2012
697

#### jpanhalt

Joined Jan 18, 2008
9,085
If available at your location, a simple coupler like this is cheap ($2.98 USD): Home Depot carries them in the US. John Thread Starter #### RodneyB Joined Apr 28, 2012 697 If available at your location, a simple coupler like this is cheap ($2.98 USD):

View attachment 89028

Home Depot carries them in the US.

John
Thank you. In Zimbabwe there is no Chance I would find one here