FE Channels

As discussed in the Introduction , the OT is geographically subdivided in:

- 3 stations: T1, T2, T3;
- 4 layers: L0 (X), L1 (U), L2 (V), L3 (X);
- 4 quarters: Q0, Q1, Q2, Q3.

Here an overview of the channel numbering scheme is given. This is determined by the channel sequence in the OTIS , folded with the numbering scheme of the four OTIS Boards on the FE Box.

Since all 408 FE Boxes (128 channels) on the OT detector have identical construction, their geometrical positions influence the channel numbering:

- unplugging and taking a FE Box out of the top side of a module and plugging it in the bottom side of the same module implies an 180 degrees rotation around the Z axis;
- analogously, unplugging and taking a FE Box out of a module and plugging it in the corresponding module in the layer right behind implies an 180 degrees rotation around the Y axis.

The description of the channel numbering scheme can be found in:

Two possible implementations are given below: