Several types of 4-core indoor multimode optical cables are used

4-core indoor multimode optical cables are commonly available in OM1, OM2, OM3, OM4, and OM5 types, each differing in core size, bandwidth, transmission distance, and light source compatibility.Overview of Multimode Fiber TypesMultimode fiber (MMF) is designed for short- to medium-range communication, typically within buildings or campuses. A 4-core indoor MMF cable contains four individual fibers, allowing multiple connections or redundancy in a single cable. The main types are:OM1: Core diameter of 62.5 µm, orange jacket, LED light source. Supports 1G Ethernet up to 275 meters and 10G Ethernet up to 33 meters. Commonly used in older network infrastructures for 100M Ethernet applications .OM2: Core diameter of 50 µm, orange jacket, LED light source. Supports 1G Ethernet up to 550 meters and 10G Ethernet up to 82 meters. Suitable for slightly higher-speed networks than OM1 .OM3: Core diameter of 50 µm, aqua jacket, optimized for laser-based VCSEL equipment. Supports 10G Ethernet up to 300 meters, 40G/100G Ethernet up to 100 meters. Ideal for modern high-speed indoor networks .OM4: Core diameter of 50 µm, aqua jacket, laser-optimized. Extends 10G Ethernet distances up to 550 meters and supports 40G/100G Ethernet at longer distances than OM3. Fully backward compatible with OM3 .OM5: Core diameter of 50 µm, lime or aqua jacket, designed for wideband multimode fiber (WBMMF) supporting wavelength-division multiplexing (WDM). Supports 40G/100G Ethernet up to 150 meters and 10G Ethernet up to 550 meters. Optimized for future-proof high-speed applications .Key Considerations for 4-Core Indoor CablesBandwidth: OM1 (200 MHz·km), OM2 (500 MHz·km), OM3 (2000 MHz·km), OM4 (4700 MHz·km), OM5 (4700 MHz·km with WDM support). Higher bandwidth allows longer distances at higher data rates .Light Source: OM1 and OM2 use LEDs, while OM3, OM4, and OM5 are optimized for VCSEL lasers, enabling higher-speed transmission .Jacket Color: Orange for OM1/OM2, aqua for OM3/OM4, lime or aqua for OM5, helping with easy identification in installations .Applications: OM1/OM2 are mostly legacy systems; OM3/OM4 are standard for modern data centers and enterprise networks; OM5 is suitable for high-speed, WDM-enabled networks .SummaryChoosing the right 4-core indoor multimode optical cable depends on required data rates, transmission distance, and future network upgrades. For new installations, OM3 or OM4 is typically recommended, while OM5 is ideal for WDM applications and future-proofing. OM1 and OM2 remain in use for legacy systems but are limited in speed and distance.

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