--- product_id: 110162458 title: "Networx Fast Ethernet Loopback Tester (Cat5e) - RJ45 Port Validator for 10/100Base-T Networks - Legacy Network Diagnostics" brand: "networx" price: "C$1480" currency: NIO in_stock: true reviews_count: 7 category: "Networx" url: https://www.desertcart.ni/products/110162458-networx-fast-ethernet-loopback-tester-cat5e-rj45-port-validator-10 store_origin: NI region: Nicaragua --- # 10/100 Mbps Fast Ethernet support Loops Orange & Green pairs for instant link verification Durable molded PVC with gold-plated contacts Networx Fast Ethernet Loopback Tester (Cat5e) - RJ45 Port Validator for 10/100Base-T Networks - Legacy Network Diagnostics **Brand:** networx **Price:** C$1480 **Availability:** ✅ In Stock ## Summary > 🔌 Plug into legacy network mastery — test smarter, not harder! ## Quick Answers - **What is this?** Networx Fast Ethernet Loopback Tester (Cat5e) - RJ45 Port Validator for 10/100Base-T Networks - Legacy Network Diagnostics by networx - **How much does it cost?** C$1480 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ni](https://www.desertcart.ni/products/110162458-networx-fast-ethernet-loopback-tester-cat5e-rj45-port-validator-10) ## Best For - networx enthusiasts ## Why This Product - Trusted networx brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact & Durable Design:** Fits snugly in any toolkit with rugged PVC housing and corrosion-resistant gold contacts. - • **Instant Link Verification:** Loopback plug loops critical wire pairs to confirm active port status in seconds. - • **Lifetime Warranty Confidence:** Backed by Networx’s lifetime warranty, ensuring your testing tool never lets you down. - • **Optimized for Cat5e Networks:** Engineered specifically for reliable 10/100 Mbps Ethernet testing—no guesswork needed. - • **Legacy Network Diagnostics, Simplified:** Effortlessly test 10Base-T & 100Base-TX ports on older gear without breaking the bank. ## Overview The Networx Fast Ethernet Loopback Tester (LB-RJ45S) is a compact, cost-effective diagnostic tool designed for verifying 10Base-T and 100Base-TX Ethernet ports on legacy network equipment. Featuring a durable molded PVC body with gold-plated contacts, it loops the Orange and Green wire pairs to confirm link status quickly and reliably. Optimized for Cat5e networks and backed by a lifetime warranty, this tester is an essential addition to any IT professional’s toolkit for fast, accurate port troubleshooting. ## Description Legacy 10/100 Port Tester. Verify network connectivity on legacy equipment with the Networx Fast Ethernet Loopback Tester. This cost-effective adapter loops the Orange and Green wire pairs (1-2 and 3-6) to confirm link status on standard 10Base-T and 100Base-TX ports. Ideal for diagnosing older switches and wall jacks, it offers a durable, molded solution for basic network troubleshooting. (Note: For Gigabit testing, please see our Gigabit Loopback Tester: LB-GB45S). Review: Intended for IT - Very Good product and works as it it intended for. Just make sure you get the right one for the job. The Gig loopback is different from the RJ45. Although technically both are RJ45 structure, the internal wiring is different. These loopback are great for Analyst remoting-in and conducting their own company proprietary test on their machines. Review: A Test Kit Must - Having a reliable way to quickly to check for a port failure is a must. Doing a quick loopback test is a fast, easy way to check a port. I like the design of this device because all of the wires are tucked inside the body. ## Features - LEGACY NETWORK DIAGNOSTICS: A cost-effective loopback plug designed specifically for testing standard Fast Ethernet (10Base-T and 100Base-TX) ports. - LINK VERIFICATION: Loops the Orange and Green pairs (Pins 1-3 and 2-6) to verify link status and troubleshoot active ports on older network equipment. - COMPACT DESIGN: Durable molded PVC housing fits easily in any tool kit. Gold-plated contacts ensure a reliable connection for repeated testing. - CAT5E RATED: Optimized for 10/100 Mbps networks. (Note: For Gigabit testing, please use the Networx Gigabit Loopback Tester, Part: LB-GB45S). - LIFETIME WARRANTY: Backed by the Networx Lifetime Warranty. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00E4OKJ68 | | Brand | Networx | | Color | Blue | | Compatible Devices | Router, Switch, Computer | | Connector Type | Ethernet | | Customer Reviews | 4.3 out of 5 stars 32 Reviews | | Global Trade Identification Number | 00845425016522 | | Item Dimensions | 2 x 1 x 0.75 inches | | Item Weight | 18.14 g | | Item dimensions L x W x H | 2 x 1 x 0.75 inches | | Manufacturer | Networx™ | | Mfr Part Number | LB-RJ45S | | Model Number | LB-RJ45S | | Number of Items | 1 | | Number of Ports | 2 | | Package Quantity | 1 | | UPC | 845425016522 | | Unit Count | 1 Count | | Warranty Type | Lifetime | ## Product Details - **Brand:** Networx - **Color:** Blue - **Compatible Devices:** Router, Switch, Computer - **Connector Type:** Ethernet - **Item dimensions L x W x H:** 2 x 1 x 0.75 inches ## Images ![Networx Fast Ethernet Loopback Tester (Cat5e) - RJ45 Port Validator for 10/100Base-T Networks - Legacy Network Diagnostics - Image 1](https://m.media-amazon.com/images/I/71IVjS2+I7L.jpg) ![Networx Fast Ethernet Loopback Tester (Cat5e) - RJ45 Port Validator for 10/100Base-T Networks - Legacy Network Diagnostics - Image 2](https://m.media-amazon.com/images/I/71i9XvGNCEL.jpg) ![Networx Fast Ethernet Loopback Tester (Cat5e) - RJ45 Port Validator for 10/100Base-T Networks - Legacy Network Diagnostics - Image 3](https://m.media-amazon.com/images/I/61ts9XStUpL.jpg) ![Networx Fast Ethernet Loopback Tester (Cat5e) - RJ45 Port Validator for 10/100Base-T Networks - Legacy Network Diagnostics - Image 4](https://m.media-amazon.com/images/I/61WDZ8LPogL.jpg) ![Networx Fast Ethernet Loopback Tester (Cat5e) - RJ45 Port Validator for 10/100Base-T Networks - Legacy Network Diagnostics - Image 5](https://m.media-amazon.com/images/I/61ViiNFxJEL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: Is there any danger of using these to check ports in a power-over-ethernet (poe) switch?** A: Only if you have done some crazy hardware alterations or a homicidal arch nemesis. **Q: Will this work for 10Gbase-T connections over cat6a?** A: It should. Cat6 should pass lower data rates just fine. You'll just get link lights or not. **Q: Will this test if the eithernet port on my camera is working?** A: It will be able to test Ethernet connection if your device has a network card that transmit the signal. **Q: Where is the product made? Thanks.** A: These are made in China, shipped from USA ## Customer Reviews ### ⭐⭐⭐⭐⭐ Intended for IT *by J***A on November 16, 2021* Very Good product and works as it it intended for. Just make sure you get the right one for the job. The Gig loopback is different from the RJ45. Although technically both are RJ45 structure, the internal wiring is different. These loopback are great for Analyst remoting-in and conducting their own company proprietary test on their machines. ### ⭐⭐⭐⭐⭐ A Test Kit Must *by C***N on September 4, 2020* Having a reliable way to quickly to check for a port failure is a must. Doing a quick loopback test is a fast, easy way to check a port. I like the design of this device because all of the wires are tucked inside the body. ### ⭐⭐⭐⭐ It works *by T***I on July 29, 2020* There's a lot of bad reviews for this product, so I was hesitating to make a purchase. In the end, I decided to make a gamble purchase and I'm happy to say that I'm a lucky one. The products are working as expected and I don't need to request for any refund or anything else. There's nothing much to add for this review other than to share my experience. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ni/products/110162458-networx-fast-ethernet-loopback-tester-cat5e-rj45-port-validator-10](https://www.desertcart.ni/products/110162458-networx-fast-ethernet-loopback-tester-cat5e-rj45-port-validator-10) --- *Product available on Desertcart Nicaragua* *Store origin: NI* *Last updated: 2026-08-26*