MTP/MPO connector fiber assignment

Base-8 · Base-12 · Base-16 · Base-24 — TIA-568-C.3 / IEC 61754-7 · Key-up face view

Base-8 (MPO-12 body)
12 positions · P1–4 + P9–12 active
100G SR4 · 1 link/connector
KEY 1 2 3 4 5 6 7 8 9 10 11 12
Key-up · 1×12 body · P5–8 unused (center 4)
1
2
3
4
5
6
7
8
9
10
11
12
P1–4 Tx · P9–12 Rx · P5–8 unused
Total positions12
Active fibers8
Unused4 (center)
100G SR4 links1
Base-12 (MPO-12 body)
12 positions · P1–12 all active
100G/400G · 1 link/connector
KEY 1 2 3 4 5 6 7 8 9 10 11 12
Key-up · 1×12 body · all positions active
1
2
3
4
5
6
7
8
9
10
11
12
P1–6 Tx · P7–12 Rx (all active)
Total positions12
Active fibers12
Unused0 ✓
100G SR4 links1
Base-16 (MPO-24 body)
24 positions (2×12) · 16 active
P1–4, P9–12, P13–16, P21–24
KEY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 R1 R2
Key-up · 2×12 body · P5–8 and P17–20 unused
Row 1 — P1–12
1
2
3
4
5
6
7
8
9
10
11
12
Row 2 — P13–24
13
14
15
16
17
18
19
20
21
22
23
24
P1–4 Tx · P9–12 Rx · P13–16 Tx · P21–24 Rx
P5–8 + P17–20 unused (center 4 of each row)
Total positions24
Active fibers16
Unused8 (centers)
100G SR4 links2
400G SR8 links1
Base-24 (MPO-24 body)
24 positions (2×12) · all active
400G SR8 ×1.5 · 3 links/connector
KEY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 R1 R2
Key-up · 2×12 body · all 24 positions active
Row 1 — P1–12
1
2
3
4
5
6
7
8
9
10
11
12
Row 2 — P13–24
13
14
15
16
17
18
19
20
21
22
23
24
P1–6 Tx · P7–12 Rx (R1) · P13–18 Tx · P19–24 Rx (R2)
Total positions24
Active fibers24
Unused0 ✓
100G SR4 links3
400G SR8 links1.5
Key notch — position 1 is leftmost from key-up face view
Unused position (ferrule hole present, no fiber)
Guide pin / pin hole (alignment)
Reference: TIA-568-C.3 · IEC 61754-7 · fiberopticom.com