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Why the LC-LC duplex OM4 patch cord matters for high-speed links

As data center links move to 40G and 100G, the patch cord between the switch port and the transceiver becomes a measurable part of the optical budget. An LC-LC OM4 patch cord is chosen for these runs because OM4 multimode fiber is designed to carry high-speed signals over longer distances than earlier multimode grades, which keeps the link within budget without moving to single-mode optics. The LC-LC duplex form factor is the standard interface for most modern transceivers, so this cord connects directly to the equipment you already plan to deploy.

For a buyer, the practical question is not whether to use a patch cord, but whether the cord you install will hold its insertion loss and return loss over the life of the rack. That is where fiber grade, connector polish, and the way the duplex pair is assembled all matter.

What this LC-LC OM4 patch cord provides

OM4 laser-optimized multimode fiber — built for the higher bandwidth and longer reach that 40G and 100G multimode links need.
Duplex LC connectors — a matched transmit and receive pair in one cord, so the two fibers stay paired and labeled for the link.
Low insertion loss — the connector polish and ferrule alignment are controlled so the cord contributes as little loss as possible to the link budget.
LSZH or PVC jacket — choose the jacket to match the environment and local fire-safety requirements.
Custom length — order the exact run length instead of coiling excess cable in the rack.

How to choose the right length and jacket

Measure the actual path from the switch port to the transceiver, including the vertical rise and any service loop you want to keep for future moves. Ordering a cord that is close to the measured path avoids a large coil that blocks airflow and makes cable management harder. If the path may change, a modest service loop is worth planning for.

For the jacket, LSZH (low smoke, zero halogen) is the common choice in enclosed or ventilated spaces where smoke and halogen emission matter in a fire. PVC is a general-purpose jacket used where those constraints are less strict. Confirm the local fire-safety requirement for the room before choosing.

Where this OM4 patch cable fits in the network

OM4 multimode patch cables are most often used inside a data center, between the top-of-rack switch and the server or storage transceiver, and in LAN backbone runs where the distance stays within the reach of multimode optics. Because the LC-LC duplex interface matches the ports on most 40G and 100G transceivers, this cord is a direct replacement or a new-build choice for those links. If your run is longer than the reach of multimode, single-mode fiber is the alternative to consider; the choice depends on the distance and the optics you plan to use.

Installation and care notes

Keep the bend radius within what the fiber and jacket allow during routing; sharp bends add loss and stress the fiber. Clean the connector end faces before mating and keep dust caps on when the cord is not in use, because a dirty end face is a common cause of intermittent loss that is hard to trace. Label both ends of the duplex pair so the transmit and receive fibers stay matched during moves.

Specifications

Parameter	Value
Connector type	LC-LC
Fiber type	Multimode OM4
Type	Duplex
Jacket	LSZH or PVC
Length	Custom
Application	Data centers, 40G/100G links, LAN

Frequently asked questions

Is this cord compatible with my 40G or 100G transceiver?

The LC-LC duplex interface is the standard for most multimode 40G and 100G transceivers. Confirm the connector type and fiber grade on your transceiver data sheet before ordering.

Can I order a specific length?

Yes. Length is custom, so provide the measured path and we will confirm the available options for your run.

What is the difference between LSZH and PVC?

LSZH produces less smoke and no halogen in a fire and is common in enclosed or ventilated spaces. PVC is a general-purpose jacket for less strict environments. Choose based on your local fire-safety requirement.

Are the cords tested before shipment?

Each cord is checked as part of the standard release process, including connector inspection and loss verification. If you need a specific test report, tell us what you require and we will confirm what can be provided.

Request product details

To get a quotation, tell us the length, jacket type, and quantity you need, and confirm the transceiver interface on your link. This helps us confirm the right configuration for your run.

Request product details

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