What Are MPO/MTP Fiber Connectors?
MPO (Multi-Fiber Push-On) is a high-density multi-fiber connector standard defined by IEC 61754-7 and TIA-604-5. It terminates multiple fibers (typically 8, 12, 16, or 24) in a single precision-molded MT ferrule, dramatically saving cabling space.
MTP (Multi-Fiber Termination Push-On) is US Conec's registered trademark, a high-performance enhanced version of MPO with tighter mechanical tolerances, lower insertion loss, and improved durability. MTP is fully compatible and intermateable with standard MPO connectors but preferred in demanding data center environments.
MPO vs MTP: Key Differences
- MPO: Generic standard name defined by IEC/TIA
- MTP: US Conec registered trademark, enhanced MPO version
- MTP offers: tighter housing tolerances, lower insertion loss (≤0.25dB typical), improved ferrule spring design
- MTP connectors allow field-replaceable ferrules; standard MPO typically does not
MPO Connector Types by Fiber Count
MPO-8 (8-Fiber)
The latest trend for 40G/100G SR4 parallel optics "Base-8" systems. Zero wasted fibers—8 fibers perfectly match SR4 transceivers (4 Tx + 4 Rx). Ideal for greenfield data centers.
MPO-12 (12-Fiber)
The traditional workhorse. Used for 40G SR4 (8 active fibers, 4 dark), 100G SR4, and 100G SR10 (24F). Widely deployed in existing data centers.
MPO-16 (16-Fiber)
Designed for 400G/800G (e.g., 400G SR8), matching QSFP-DD and OSFP transceivers with 8 Tx + 8 Rx. Recommended for new 400G-ready data centers.
MPO-24 (24-Fiber)
Two rows of 12 fibers for ultra-high-density backbone cabling. Supports 100G SR10 (10 lanes), or three simultaneous 40G links.
MPO Polarity: Type A vs Type B vs Type C
Type A (Straight-Through)
Fibers map straight through: 1→1, 2→2, 12→12. Key-Up on one end, Key-Down on the other. Requires polarity flipping components elsewhere in the link.
Type B (Reversed) — RECOMMENDED for Parallel Optics
Fibers fully reversed: 1→12, 2→11, etc. Key-Up on both ends. The crossover is built into the cable. This is the industry standard for 40G/100G/400G/800G parallel optics.
Type C (Pair-Flipped)
Adjacent pair reversal: 1↔2, 3↔4, 11↔12. For duplex breakout applications only. NEVER use for parallel optics.
Gender and Key Orientation
Male (Pinned): Has guide pins, typically used on equipment side. Female (Unpinned): No guide pins, used on trunk cable and patch panel side. Rule: one must be male, the other female in each mated pair.
UPC vs APC End-Faces
UPC: For multimode MPO, ≤0.35dB loss, black housing. APC: For single-mode MPO, 8° angle, >60dB return loss, green housing. Do NOT mix UPC and APC.
Applications in 40G/100G/400G/800G Data Centers
- 40GBASE-SR4: MPO-12, 8 fibers (4 Tx + 4 Rx)
- 100GBASE-SR4: MPO-12, 8 fibers, 4×25G
- 400GBASE-SR8: MPO-16 or MPO-24, 16 fibers (8 Tx + 8 Rx)
- 800GBASE-SR8: MPO-16, 16 fibers
Selection Guide
- New data centers: Type B polarity + Base-8 (MPO-8) or MPO-16 system
- Retrofit existing: Match existing polarity scheme consistently
- Direct 40G/100G links: Type B MPO patch cords direct to transceivers
- Structured cabling: Type A trunk + Type B patch cords at patch panels
- 400G-ready: MPO-16 system + Type B polarity
Langzhi Technology MPO Products
Langzhi Technology offers a full range of MPO/MTP trunk cables, harness cables, MPO-LC breakout cords, and 40G/100G QSFP optical transceivers. Contact us for professional data center cabling design!
