Data Center Backbone

MPO/MTP Trunk Cable Supplier for Data Center Backbones

An MPO/MTP trunk cable is a pre-terminated multi-fiber cable with an MPO-type connector on each end, used to run 8, 12, 24 or more fibers between patch panels, cassettes or equipment in a single pull. As an MPO/MTP trunk cable supplier, Lumafyn sources trunks to your fiber count, fiber type, polarity method, connector gender, length and pulling requirements, and confirms test records and labelling in the quotation before production.

Send Trunk Cable RFQ Polarity Guide

Last reviewed 2026-11-10 by the Lumafyn team · Orders are produced in our own factory in China.

MPO MTP trunk cable assembly for data center backbone cabling

What an MPO/MTP Trunk Cable Does

A trunk is the permanent backbone of a high-density channel. Instead of pulling and terminating dozens of single fibers on site, a pre-terminated trunk arrives tested, is pulled between racks or rows, and plugs into MPO cassettes, adapter panels or harnesses. That shortens installation and keeps loss predictable. Trunks are one type of MTP/MPO cable assembly; harness, breakout and conversion cables are covered on that page.

Typical Trunk Uses

Row-to-row and room-to-room backbone links in data centers
Spine-leaf links for 40G, 100G, 400G and 800G parallel optics
Cassette-to-cassette links that break out to LC duplex at each end
Telecom equipment-room backbones where space for splicing is limited

Glass display cabinet holding framed fiber patch cord and cable assembly samples — Sample photos and drawings help confirm trunk format, polarity, gender and labels before production.

Polarity and Fiber Count

MPO Trunk Polarity and Base-8 vs Base-12

Polarity and fiber count are channel decisions. Pick them once for the whole link, then order every trunk, cassette and cord to match. The MTP/MPO polarity guide walks through examples.

MPO trunk polarity methods (ANSI/TIA-568.3-D)
Method	Trunk key orientation	Fiber mapping	Notes
Type A	Key up to key down	Straight through: 1→1 … 12→12	Duplex channels use an A-to-B cord at one end and an A-to-A cord at the other
Type B	Key up to key up	Reversed: 1→12 … 12→1	Common for parallel optics; both ends use A-to-B cords
Type C	Key up to key down	Pair-wise flip: 1→2, 2→1 …	Used in some duplex designs; less common

Base-8 vs Base-12 trunks
Field	Base-8	Base-12
Fibers per connector used	8	12
Typical optics	8-fiber parallel optics (e.g. 40G/100G SR4)	Duplex links via LC cassettes; legacy designs
Fiber utilization with SR4	All fibers used	4 fibers unused per connector
Fiber counts	8, 16, 24, 32 …	12, 24, 48, 72 …

Buyer Checklist

Before You Request a Trunk Quote

Fiber count and type

Count per connector and per cable, plus OS2, OM3 or OM4.

Polarity and gender

Method A, B or C, and pinned or unpinned at each end, matched to cassettes and optics.

Polish

Singlemode MPO is usually APC; multimode MPO is usually flat-polished. Confirm against the equipment.

Length and routing

End-to-end length, slack, pulling grip and any staggered breakout at the ends.

Jacket

LSZH for many European buildings; OFNR or OFNP where North American codes apply.

Testing

Insertion loss per MPO and end-face inspection records; TIA-568.3-D allows at most 0.75 dB per mated pair as a design ceiling, and the values for your order are set in the quotation.

FAQ

MPO/MTP Trunk Cable Questions

What is the difference between MPO and MTP trunk cables?

MPO is the multi-fiber push-on connector interface defined in IEC 61754-7 and TIA-604-5. MTP® is a US Conec brand of MPO-compatible connector. If your specification requires genuine MTP® connectors, state it in the RFQ; otherwise trunks are quoted with MPO connectors.

Which polarity method should I choose?

TIA-568.3-D defines methods A, B and C. The trunk polarity must match the cassettes, harnesses and patch cords in the same channel, so choose it with the channel design, not per cable. If you are unsure, attach the link drawing and we will flag mismatches before quoting.

Pinned or unpinned trunk ends?

Two mated MPO connectors need one pinned (male) and one unpinned (female). Choose trunk ends to suit what they plug into: cassettes and equipment ports each have a fixed gender.

Base-8 or Base-12?

Base-8 uses all fibers on 8-fiber parallel optics such as 40G/100G SR4; Base-12 is common in legacy and LC-breakout designs. Choose by the optics and cassettes in the channel.

Can you supply trunks with pulling grips and labels?

Yes, pulling eyes or grips, furcation and staggered break-out lengths, and labels at each end can be specified per line; details are confirmed in the quotation.

Standards referenced on this page

IEC 61754-7 – MPO connector interface (MTP® is a registered trademark of US Conec).
ANSI/TIA-568.3-D – optical fiber cabling components: maximum 0.75 dB insertion loss per mated connector pair; minimum return loss 20 dB multimode and 35 dB singlemode; duplex A-to-B and array polarity methods A, B and C.
ISO/IEC 11801-1 – generic cabling; defines the OS2, OM3 and OM4 cabled-fiber categories.
IEEE 802.3 – Ethernet physical layers, including multimode reach for 10GBASE-SR.
IEC 61300-3-35 – visual inspection of fiber optic connector end faces.

Standard values are industry minimums or definitions, not Lumafyn product data. Insertion loss, return loss, length tolerance, MOQ and lead time for your order are confirmed in your quotation and test records.