The abbreviation 100G FR means 100 Gigabit Ethernet 2 km Reach. A 100G single-mode optical interface class for reaches up to 2 km, commonly using a single 100G PAM4 optical lane. Its practical scope is defined by how it is applied in Data center and campus interconnects up to 2 km, not by the abbreviation alone.
The reference framework matters when specifying 100G FR for Data center and campus interconnects up to 2 km. The applicable IEEE 802.3, ITU-T, or multi-source agreement defines lane count, wavelength, fiber, reach, and interoperability assumptions. A product name or quotation that mentions 100G FR without that context is not yet a complete requirement.
Related term FR / FR4 is relevant but not interchangeable with 100G FR. FR / FR4 is a single-mode optical standard generally supporting up to 2 km; FR4 combines four wavelengths on duplex fiber, whereas 100G FR is a 100G single-mode optical interface class for reaches up to 2 km, commonly using a single 100G PAM4 optical lane. A design may require both, only one, or a specific combination of them.
When selecting or documenting 100G FR, verify lane count, wavelength plan, fiber type, connector, reach, FEC assumption, and optical power budget. A common mistake is to assume that support for LR / LR4 automatically confirms support for 100G FR; the exact data sheet, host configuration, and test conditions must show that relationship.
Frequently Asked Questions
What separates 100G FR from FR / FR4?
The scope is different: 100G FR is a 100G single-mode optical interface class for reaches up to 2 km, commonly using a single 100G PAM4 optical lane. FR / FR4 is a single-mode optical standard generally supporting up to 2 km; FR4 combines four wavelengths on duplex fiber. The applicable specification and system requirement determine how they interact.
Where is 100G FR normally used?
Typical use includes Data center and campus interconnects up to 2 km. The exact implementation still depends on the host equipment, link design, environment, and governing specification.
What should a 100G FR 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 FR.
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