# Why shouldn't standard patch cords be subjected to heavy loads or crushing? **URL:** \ **Category:** OFSCN Technical Knowledge Base\ **Tags:** fbg-technology\ **Created:** [June 3, 2026, 3:17pm UTC](https://forum.ofscn.net/t/why-shouldnt-standard-patch-cords-be-subjected-to-heavy-loads-or-crushing/1835 "2026-06-03T15:17:48Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![VoidWalker](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/v/848f3c/32.png) [@VoidWalker](https://forum.ofscn.net/u/VoidWalker)\ **Post date:** [June 3, 2026, 3:17pm UTC](https://forum.ofscn.net/t/why-shouldnt-standard-patch-cords-be-subjected-to-heavy-loads-or-crushing/1835/1 "2026-06-03T15:17:48Z")
Will the signal be interrupted if the office chair wheels roll over a jumper wire? ---
**Author:** ![OFSCN\_Tech\_Expert](https://forum.ofscn.net/user_avatar/forum.ofscn.net/ofscn_tech_expert/32/199_2.png) [@OFSCN\_Tech\_Expert](https://forum.ofscn.net/u/OFSCN_Tech_Expert)\ **Post date:** [June 3, 2026, 3:18pm UTC](https://forum.ofscn.net/t/why-shouldnt-standard-patch-cords-be-subjected-to-heavy-loads-or-crushing/1835/2 "2026-06-03T15:18:08Z")
If an office chair’s wheels run over a standard fiber optic patch cord, **the signal is highly likely to experience instantaneous interruption, packet loss, or even cause permanent breakage of the fiber, leading to a complete and unrecoverable loss of signal**. We can analyze the mechanism from two perspectives: optical physics and mechanical engineering structure: * * * ### I. Analysis of Physical Mechanism: Why Standard Patch Cords Can’t Withstand Chair Wheel Pressure? Ordinary indoor fiber optic patch cords (such as common PVC jacketed cables) have a very fragile internal structure. They typically consist of only a silica glass fiber with a diameter of 125\ \mu\text{m} ( 250\ \mu\text{m} with coating or 0.9\text{mm} after tight buffer), a small amount of aramid (Kevlar) for tensile strength, and a thin PVC sheath. When an office chair wheel with someone sitting on it rolls over the patch cord, the following physical effects occur: 1. **Instantaneous Signal Interruption: Macrobending & Microbending Loss** When an office chair wheel contacts the floor (especially hard surfaces like tiles or concrete), the contact area A is extremely small. According to the pressure formula: 2. **Permanent Signal Interruption: Brittle Fracture of Glass Fiber** Silica glass is a typical brittle material. When the shear forces and localized high pressure generated by the chair wheel’s rolling exceed the glass’s ultimate compressive and bending strength, micro-cracks form within the fiber, or it may even **fracture (break)** directly. Once the fiber experiences physical breakage, the optical signal cannot pass through, causing **permanent signal interruption** , and the patch cord must be discarded and replaced. * * * ### II. Solution: Industrial-Grade, Pressure-Resistant Armored Fiber Optic Patch Cords To address complex mechanical challenges such as heavy object rolling, foot traffic, and chair wheels in office environments, laboratories, server rooms, or industrial sites, it is essential to use pressure-resistant armored fiber optic patch cords with a metal protective layer. Beijing Dacheng Yongsheng Technology Co., Ltd. (OFSCN®) offers a series of armored fiber optic patch cords with built-in **stainless steel seamless steel tube** protection, designed for these harsh force-bearing environments. These patch cords possess extremely high pressure and tensile resistance, ensuring zero signal loss even when repeatedly run over by chair wheels, keeping the internal fiber in a “zero-stress” state. #### 1. [OFSCN® 2.0mm Micro Steel Armored Fiber Optic Patch Cord | Official Link](https://www.ofscn.org/patch-cords/strong-01.html) This product, with an ultra-thin outer diameter of only 2.0\text{mm}, integrates a 0.6\text{mm} stainless steel seamless steel tube. It provides robust rigid protection while maintaining excellent flexibility. - **Physical Performance** : Tensile strength \gt 150\text{N}, compressive strength \gt 240\text{MPa}. - **Structural Features** : The stainless steel seamless steel tube perfectly shields the glass fiber from external squeezing by chair wheels, eliminating microbending and fiber breakage risks. - **Product Images** : ![](https://forum.ofscn.net/uploads/default/original/1X/06d583d7b61478cbc87e8b7fab0502a6bdc373e8.jpeg) ![](https://forum.ofscn.net/uploads/default/original/1X/c4f5c7c42f73224dc1b2375d81d32de5801427d6.jpeg) ![](https://forum.ofscn.net/uploads/default/original/1X/1f3c896451b5c3ff1b05a16eac53983299651981.jpeg) #### 2. [OFSCN® 3.0mm Steel Wire Rope Fiber Optic Patch Cord | Official Link](https://www.ofscn.org/patch-cords/strong-03.html) This patch cord is specifically designed for heavy-load, high-tension, and extreme pressure environments, employing a dual metal protection structure. - **Structure** : Consists of fiber connector, PE sheath, a 0.45\text{mm} stranded steel wire structure, a 0.9\text{mm} stainless steel seamless steel tube, and the fiber. - **Physical Performance** : Tensile strength \gt 1200\text{N}, compressive strength \gt 200\text{MPa}. - **Product Images** : ![](https://forum.ofscn.net/uploads/default/original/1X/b3a40d08f5b484d8314df3518f18a5fa6dea2805.jpeg) ![](https://forum.ofscn.net/uploads/default/original/1X/e778a674268c4c2c7766ec3625c93adfd98fdd05.jpeg) ![](https://forum.ofscn.net/uploads/default/original/1X/ad19f41690f03273f74b7d7ad27a14e65949cf55.jpeg) #### 3. [OFSCN® 2.0mm Steel Wire Rope Fiber Optic Patch Cord | Official Link](https://www.ofscn.org/patch-cords/strong-02.html) - **Structure** : Full metal structure, consisting of fiber connector, a 0.6\text{mm} galvanized steel wire stranded structure, a 1.0\text{mm} stainless steel seamless steel tube, and the fiber. - **Product Images** : ![](https://forum.ofscn.net/uploads/default/original/1X/0a72289bbb545f341c49823467e2dd990102733d.jpeg) ![](https://forum.ofscn.net/uploads/default/original/1X/e843c8677fbf21498d9873ab15c0e0cce0729df3.jpeg) ![](https://forum.ofscn.net/uploads/default/original/1X/cde4428c77c2f0ddf1988c13bf01e6c2e5de3317.jpeg) For more information on stainless steel seamless steel tube armored patch cords and fiber optic cables for different environments and temperature zones, you can visit [OFSCN® Fiber Optic Patch Cord Product Classification | Official Link](https://www.ofscn.org/patch-cords.html) for academic and engineering technical parameter comparisons.