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--- networking:fiber_optics [2023/07/15 18:48] – aperez
+++ networking:fiber_optics [2025/04/01 11:14] (current) – aperez
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 **Multimode Fiber Types: OM1 vs OM2 vs OM3 vs OM4 vs OM5**
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+{{ :networking:fb1.jpeg?400 |}}
+{{ :networking:multimodo.jpg?600 |}}
 **Multimode fiber** is a common choice to achieve 10 Gbit/s speed over distances required by LAN enterprise and data center applications. There are several kinds of multimode fiber types available for high-speed network installations, and each with a different reach and data-rate capability. With so many options, it can be tough to select the most suitable multimode fiber. OM1 vs OM2 vs OM3 vs OM4 vs OM5, which to choose? You may get answer in this article.
@@ Line 55: / Line 59: @@
-  MMF  Category	Fast Ethernet	1GbE	10GbE	40GbE	100GbE
+^ MMF Category ^ Fast Ethernet ^ 1GbE ^ 10GbE ^ 40GbE ^ 100GbE ^
-  OM1 	        2000m	        275m	33m	/	/
+| OM1          | 2000m         | 275m  | 33m   | /     | /      |
-  OM2 	        2000m	        550m	82m	/	/
+| OM2          | 2000m         | 550m  | 82m   | /     | /      |
-  OM3 	        2000m	        /	300m	100m	70m
+| OM3          | 2000m         | /     | 300m  | 100m  | 70m    |
-  OM4 	        2000m	        /	550m	150m	150m
+| OM4          | 2000m         | /     | 550m  | 150m  | 150m   |
-  OM5 	        /	        /	550m	150m	150m
+| OM5          | /             | /     | 550m  | 150m  | 150m   |
 **What’s the Differences Between Single Mode and Multimode Fiber?**
@@ Line 86: / Line 91: @@
-   MMF Connector    Ferrule Size      Typical Insertion Loss (dB)    Cost(FS.com)     Application Features
+<div style="text-align: center;">
-   SC	            φ2.5mm ceramic    0.25-0.5	                     US$ 0.65	      Mainstream, reliable, fast
+^ MMF Connector ^ Ferrule Size ^ Typical Insertion Loss (dB) ^ Cost (FS.com) ^ Application Features ^
-                                                                                      deployment, filed fit
+| SC            | φ2.5mm ceramic   | 0.25-0.5                    | US$ 0.65        | Mainstream, reliable, fast deployment, field fit |
+| LC            | φ1.25mm ceramic  | 0.25-0.5                    | US$ 0.78        | High density, cost-effective, field fit |
-   LC	            φ1.25mm ceramic   0.25-0.5	                     US$ 0.78	      High density, cost-
+| FC            | φ2.5mm ceramic   | 0.25-0.5                    | US$ 0.74        | High precision, vibration environment, field fit |
-                                                                                      effective,filed fit
+| ST            | φ2.5mm ceramic   | 0.25-0.5                    | US$ 0.61        | Military, field fit |
+</div>
-   FC	            φ2.5mm ceramic    0.25-0.5	                     US$ 0.74	      High precision, vibration
-                                                                                      environment, field fit
-   ST	            φ2.5mm ceramic    0.25-0.5	                     US$ 0.61	      Military, filed fit
 **What’s The Advantages of Multimode Fiber?**
@@ Line 119: / Line 122: @@
+----
+----
+====== LRM (Long Reach Multimode) ======
+LRM stands for Long Reach Multimode, which is an optical connectivity standard defined in **IEEE 802.3aq**.
+Main Characteristics:
+Allows data transmission over multimode fiber (MMF) at longer distances than typically supported by standard multimode modules (such as SX or SR).
+**Specifically designed to work up to 220 meters over OM1, OM2, and OM3 multimode fiber (usually 62.5/125 μm or 50/125 μm).
+**
+Uses SFP+ LRM modules that generally operate at 10 Gbps.
+Commonly used in installations that need to reuse existing multimode cabling without having to replace it with single-mode fiber (SMF).
+----
+----