---
product_id: 110162458
title: "Networx Fast Ethernet Loopback Tester (Cat5e) - RJ45 Port Validator for 10/100Base-T Networks - Legacy Network Diagnostics"
brand: "networx"
price: "RM102"
currency: MYR
in_stock: true
reviews_count: 10
category: "Networx®"
url: https://www.desertcart.com.my/products/110162458-networx-fast-ethernet-loopback-tester-cat5e-rj45-port-validator-10
store_origin: MY
region: Malaysia
---

# 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:** RM102
**Availability:** ✅ In Stock

## Summary

> ⚡ Plug in. Test fast. Stay connected. Legacy network diagnostics, redefined.

## 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?** RM102 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.my](https://www.desertcart.com.my/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 gold-plated contacts for reliable, repeat testing.
- • **Instant Link Verification:** Loopback plug loops key wire pairs to confirm active port status in seconds—no guesswork needed.
- • **Lifetime Warranty Confidence:** Backed by Networx’s lifetime warranty—because your network deserves tools that last.
- • **Optimized for Cat5e Networks:** Engineered specifically for 10/100 Mbps speeds to ensure accurate diagnostics on legacy infrastructure.
- • **Legacy Network Diagnostics Made Simple:** Effortlessly test and troubleshoot 10/100Base-T ports on older equipment without breaking the bank.

## Overview

The Networx Fast Ethernet Loopback Tester is a compact, cost-effective tool designed to validate and troubleshoot 10/100Base-T Ethernet ports on legacy network equipment. Featuring a durable molded PVC housing with gold-plated contacts, it loops the Orange and Green wire pairs to verify link status quickly and reliably. Optimized for Cat5e networks and backed by a lifetime warranty, this tester is an essential addition to any professional network engineer’s toolkit.

## 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: IMPORTANT TOOL for every network engineer. - It's basic, but it's necessary, and it works VERY well. Can't tell what switchport a wall port goes to? Throw on loopback detection on every port, plug this thing in, BOOM! Port identified! WAY easier than toning out cables!
Review: Good product, great for troubleshooting older ethernet devices - Many older devices without auto-negotiation of RX-TX pin positions need a crossover cable rather than a common straight-through cable. This makes it easy to swap without needing a separate crossover cable.

## 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 | 4.4 4.4 out of 5 stars (369) |
| Global Trade Identification Number | 00845425016522 |
| Item Dimensions | 2 x 1 x 0.75 inches |
| Item Weight | 18.14 g |
| Manufacturer | Networx™ |
| Model Number | LB-RJ45S |
| Number of Ports | 2 |
| Package Quantity | 1 |
| Power Plug Type | No Plug |
| UPC | 845425016522 |
| Unit Count | 1.0 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

### ⭐⭐⭐⭐⭐ IMPORTANT TOOL for every network engineer.
*by J***) on January 17, 2024*

It's basic, but it's necessary, and it works VERY well. Can't tell what switchport a wall port goes to? Throw on loopback detection on every port, plug this thing in, BOOM! Port identified! WAY easier than toning out cables!

### ⭐⭐⭐⭐⭐ Good product, great for troubleshooting older ethernet devices
*by F***G on February 7, 2024*

Many older devices without auto-negotiation of RX-TX pin positions need a crossover cable rather than a common straight-through cable. This makes it easy to swap without needing a separate crossover cable.

### ⭐⭐⭐⭐⭐ 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.

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*Product available on Desertcart Malaysia*
*Store origin: MY*
*Last updated: 2026-03-30*