MTH Trains TIU- AIU Cord

https://ogrforum.ogaugerr.com/topic/tiu-to-aiu-cable

If you "do" eBay, they come in a variety a lengths and very inexpensive.

Edit: found this more recent thread too:

https://ogrforum.ogaugerr.com/...03#65344033969014803

Search eBay (or Amazon or wherever) for "6P6C Reverse cable" and choose your length.  

"Reverse" is shown above.  6P6C simply means the 6 Positions 6 Conductors - the connectors have 6 available slots and all 6 are being used as conductors.  I just checked eBay and there are 7 ft, 14 ft, and 25 ft cables for $4 (free shipping) from a U.S. based seller.

Ricky,

The cable is a standard RJ12, 6 Conductor Cross Wired Modular Telephone cable. They are available in several lengths here on Amazon.

Regarding cable length, consider the following from The DCS Companion 3rd Edition page 68 and The DCS Wifi Companion 1st Edition page 33:

The AIU to TIU cable carries both DCS commands to control the relays and the electrical current to energize them. If only switch terminals are being used, the total AIU cable length can be well over 100 feet, because only one relay is energized at a time. When using accessory terminals, however, many relays may be energized simultaneously causing a greater voltage drop over a long wire run. If so, it's safest to stay under 25 feet of total length between all the AIUs on a chain.

This and a whole lot more about DCS is all in MTH’s “The DCS Companion 3rd Edition!" This book is available from many fine OGR advertisers and forum sponsors, or as an eBook or a printed book at MTH's web store!

This and a whole lot more about DCS WiFi is all in MTH’s “The DCS WiFi Companion 1st Edition!" This book is available from many fine OGR advertisers and forum sponsors, or as an eBook or a printed book at MTH's web store! Get the free TMCC & Legacy Addendum here!

We just made cords using a crimp tool and connectors  We have one cable that is 75 feet long with no problems

Just a heads up, I just installed a new old stock AIU and the 2 foot cable that was in the box from MTH was not cross wired, it was straight through.  I don't know how old the AIU was but thanks for the heads up on the cable.

Thanks all for this great thread.I was struggling because my TIU would not recognize the AIU. I’ve ordered the crossover RJ12 and have high confidence it will solve the problem! Thanks again!

The RJ-12 crossover cable was the answer! Thanks to all who contribute great inputs to this super forum!