![]() ![]() ![]() The only way to identify the distance difference between OM3 and OM4 cable (both aqua color) was by reading the cable legend. This caused a problem when installers expected any aqua cable to support maximum 10-Gbps distances. Since OM4 fiber supports longer distances than OM3, if both types were aqua color, installers could not know what distance an aqua cable would support. At first, the industry also used an aqua cable jacket to identify OM4 fiber, but soon realized that prior and new installations were mixed with OM3 and OM4 fiber both supporting 10-Gbps transmission. We know that OM3 cable had an aqua color cable jacket. Next came (OM4) fiber, which supported longer distances at the same data transmission. ![]() In addition, (OM3) fiber to support 10-Gbps transmissions used VSCEL (Vertical Cavity Surface Emitting Lasers) instead of the LEDs that previous versions of multimode fiber used. This was important because (OM3) fiber was classified as laser-optimized fiber that supported 10-Gbps data transmission. For the third generation of multimode fiber optic cable, which still was 50/125-um (OM3), the cable jacket color changed from orange to aqua. For the next generation of multimode fiber 50/125-um (OM2), the industry kept the same jacket color of orange, but this changed moving forward. Let's look back to learn why color-coding is relevant: For the first generation of multimode fiber 62.5/125-um (OM1), all cabling jackets were orange. One way the industry identifies the type of fiber is by color-coding the PVC cable jacket. The fourth component of a fiber cable is a PVC jacket. The third component of a fiber cable, a strength member made up of Kevlar yarn, surrounds the glass core. The cladding is built up to 125-um over the glass core. The second component of a fiber optic cable, a layer of material called cladding, covers the core and is used to contain the light in the glass core. The glass core rests in the center of the fiber cable. The fiber glass core for both multimode and singlemode is extremely small: about the size of a human hair and by visual inspection you can't tell one core from another. With singlemode fiber, there is only one glass core, a much smaller 9/125-um referred to as (OS2). Looking closer at multimode fiber, there is one core type of 62.5/125-um (OM1) and currently four core types of 50/125-um fiber (OM2) through (OM5). With multimode fiber, there are two common glass cores, 62.5/125-um and 50/125-um. ![]() Each glass type has very specific applications that include data bandwidth and transmission distances, all of which generally cannot be intermixed. The core can be comprised of one of two common glass types, multimode fiber optic cable and singlemode fiber optic cable. Fiber Optic Cable Color IdentificationsĪ fiber optic cable is made up of four components: the core, cladding, a Kevlar® yarn as the strength member, and a PVC jacket. This is very true in the fiber optic world. Under normal circumstances, product colors don't affect the product's performance or function, but do provide a good way to identify the type of the product in general. The colors of fiber optic cable and its components play a major part in your installation and understanding how everything goes together. Knowing your colors can help you understand fiber optics technology. ![]()
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