What is the large device called?
The device is a controller.
    src        edge_attr  dst
0     1               on    7
1     1  to the right of    4
2     1  to the right of    3
3     3               on    7
4     3   to the left of    1
5     3   to the left of    4
6     4               on    7
7     4  to the right of    3
8     4   to the left of    1
9     5               on    7
10    8  to the right of   11
11    9  to the right of   11
12    9               on    8
13   10  to the right of   11
14   11   to the left of   10
15   11   to the left of    8
16   11   to the left of    9