21
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D3
D2
D1
D0
fiber switch
1x2 1x3
1x4
1x6
1x9
1x12
0
0
0
0
1
1
1
1
1
1
0
0
0
1
2
2
2
2
2
2
0
0
1
0
3
3
3
3
3
0
0
1
1
4
4
4
4
0
1
0
0
5
5
5
0
1
0
1
6
6
6
0
1
1
0
7
7
0
1
1
1
8
8
1
0
0
0
9
9
1
0
0
1
10
1
0
1
0
11
1
0
1
1
12
table 6: BCD-code
