The abbreviation 100G LR means 100 Gigabit Ethernet Long Reach. A 100G single-mode optical interface class intended for long-reach links, commonly up to 10 km depending on the specified variant. Its practical scope is defined by how it is applied in Campus, metro access and data center interconnects, not by the abbreviation alone.
Within Optical Standards, 100G LR must be interpreted through the correct technical or commercial reference. The applicable IEEE 802.3, ITU-T, or multi-source agreement defines lane count, wavelength, fiber, reach, and interoperability assumptions. This context determines which parts of the 100G LR definition are mandatory and which remain implementation choices.
A useful boundary is the difference between 100G LR and 100G DR. The former describes a 100G single-mode optical interface class intended for long-reach links, commonly up to 10 km depending on the specified variant. The latter describes a 100G single-mode optical interface class for reaches up to 500 m, typically using one 100G PAM4 wavelength. Keeping that distinction clear prevents an interface, performance value, or commercial condition from being assumed where it was never specified.
For a deployable 100G LR requirement, record lane count, wavelength plan, fiber type, connector, reach, FEC assumption, and optical power budget. Do not infer those details from 100G ER or from a headline speed alone, because the related concept is defined separately as a 100G single-mode optical interface class for extended-reach links, commonly targeting distances around 40 km.
Frequently Asked Questions
What separates 100G LR from 100G DR?
The scope is different: 100G LR is a 100G single-mode optical interface class intended for long-reach links, commonly up to 10 km depending on the specified variant. 100G DR is a 100G single-mode optical interface class for reaches up to 500 m, typically using one 100G PAM4 wavelength. The applicable specification and system requirement determine how they interact.
Where is 100G LR normally used?
Typical use includes Campus, metro access and data center interconnects. The exact implementation still depends on the host equipment, link design, environment, and governing specification.
What should a 100G LR specification include?
It should state lane count, wavelength plan, fiber type, connector, reach, FEC assumption, and optical power budget. These details allow a supplier or engineer to verify the requirement instead of relying only on the term 100G LR.
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