Check your product list with the AM so as to get the polarity of everything set up properly. They are nice. Here are my items and the connection order.
TypeA MTP-12 cassette——Type A MTP-12 trunk——UP to Down adaptor——Type A MTP-12 trunk——TypeAF MTP-12 cassette

Truly a quality product. It worked as advertised and had no issues.

The cable is well-made and fit my module perfectly. Reasonable price and worth every penny! Highly recommend!

I use these cables for my two switches. They work great without any issues. I definitely recommend it.

These have worked flawlessly. I have purchased these for multiple times without delay or problem. Works well in my data center.

Arrived as described. Works great! We will reorder if we need. Thanks.

All cables work, no issue. Great price, fast shipping. A worthy shopping experience.

Worked exactly as expected and much better than what I bought from other sellers.

These have worked perfectly. Good quality cables and priced very reasonable.

This is my first time to buy cable from FS. I would definitely purchase again.