Modular Cable Pin-out Style: Reverse or Straight

There has always been some questions regarding the pin-out on Modular Cables.

When doing a search for modular cables one filter to look at is the Style.
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If you choose the Reverse and Standard style These Cable options are what will come up.

What is the difference between the Reverse and Standard style?

A quick way to determine the difference on the Flat Cables assemblies is to lay them flat.

The Reverse style will have a plug with a Tab up and the other end will have the Tab down.
This sometimes might be referred to as “straight through” because of the pin-out.
These are used for Data transfer.

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If we look at Digi-Key part number A2663R-25-ND from Assmann (AT-S-26-6/6/S-25/R), it is the Reverse style. On the Datasheet it will have the Drawing showing the orientation of the Plugs with the pin-out.


The pin-out will be straight through.
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The Standard style will have both tabs on the plug on the same side.
This sometimes might be referred to as “reversed” or “crossover” because of the pin-out.
These are used for voice transfer, like in a telephone.

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If we look at Digi-Key part number A1663R-25-ND from Assmann (AT-S-26-6/6/S-25), it is the Standard style. If we look at the Datasheet it will have the Drawing showing the orientation of the Plugs with the pin-out.


The pin-out will be crossed.
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Another way is to check is to take the plugs and put them side by side and look at the pin-out.

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This can be helpful for a coiled type cable assembly. The orientation of the Plugs gets turned do to the cable being coiled.

If we look at Digi-Key part number A1662R-10C-ND , Assmann part number (AT-C-26-6/6/B-10) , this will be a Flat Coiled Cable that is a Standard style.
The Datasheet will show it with the tabs on the plugs being one up and one facing down. This can make it confusing.
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Make sure to always look at the pin-out.

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If we look at Digi-Key part number A2662R-10C-ND, Assmann part number (AT-C-26-6/6/B-10/R), this will be a Flat Coiled Cable that is a Reverse style.
The Datasheet will show the Plug orientation having the Tabs on the bottom side. Again this can be confusing.

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Make sure to look at the pin-out.

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