---
product_id: 14213953
title: "Networx® Gigabit RJ45 Loopback Tester - 10/100/1000Base-T Network Port Validator - Ethernet Diagnostic Tool for Switches and Server NICs"
brand: "networx®"
price: "C$1309"
currency: NIO
in_stock: true
reviews_count: 10
category: "Networx®"
url: https://www.desertcart.ni/products/14213953-networx-gigabit-rj45-loopback-tester-10-100-1000base-t-network
store_origin: NI
region: Nicaragua
---

# Gigabit 1000Base-T support Loops all 4 wire pairs for echo test Gold-plated corrosion-free contacts Networx® Gigabit RJ45 Loopback Tester - 10/100/1000Base-T Network Port Validator - Ethernet Diagnostic Tool for Switches and Server NICs

**Brand:** networx®
**Price:** C$1309
**Availability:** ✅ In Stock

## Summary

> 🔌 Plug in. Test fast. Stay connected like a pro.

## Quick Answers

- **What is this?** Networx® Gigabit RJ45 Loopback Tester - 10/100/1000Base-T Network Port Validator - Ethernet Diagnostic Tool for Switches and Server NICs by networx®
- **How much does it cost?** C$1309 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/14213953-networx-gigabit-rj45-loopback-tester-10-100-1000base-t-network)

## 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

- • **Universal RJ45 Fit:** Engineered to securely connect to any standard RJ45 port—no adapters needed.
- • **Instant Port Validation:** Verify active network ports and link status in seconds for zero downtime.
- • **Rugged & Compact Design:** Durable molded PVC housing fits perfectly in your IT toolkit for daily use.
- • **Full Gigabit Compatibility:** Supports modern 1000Base-T and legacy 10/100 Ethernet for future-proof diagnostics.
- • **Lifetime Warranty Assurance:** Backed by Networx’s lifetime warranty—trusted by network pros worldwide.

## Overview

The Networx® Gigabit RJ45 Loopback Tester is a professional-grade Ethernet diagnostic tool designed to instantly verify network port activity and link status across 10/100/1000Base-T interfaces. Featuring a compact, durable design with gold-plated contacts, it loops all four wire pairs for accurate echo testing on switches, server NICs, and wall jacks. Universally compatible with all standard RJ45 ports and backed by a lifetime warranty, it’s an essential tool for network engineers, sysadmins, and IT installers aiming for seamless, reliable network troubleshooting.

## Description

Professional Ethernet Diagnostics. Streamline your network troubleshooting with the Networx Gigabit Loopback Tester. Designed for professional diagnostics, this compact, molded adapter loops all four wire pairs to verify active network ports in seconds. It supports full echo tests and link verification on both modern Gigabit (1000Base-T) interfaces and standard 10/100 Ethernet. Engineered for universal compatibility, it connects seamlessly to any RJ45 port, providing the correct signal return for accurate testing of switches, server NICs, and wall jacks.

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: 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.

## Features

- PROFESSIONAL NETWORK DIAGNOSTICS: Instantly verifies active network ports and link status. This molded adapter loops all four wire pairs (1-3, 2-6, 4-7, 5-8) to perform echo tests on switches, wall jacks, and NICs.
- FULL GIGABIT SUPPORT: Unlike older testers, this unit supports modern 1000Base-T interfaces while maintaining backward compatibility with standard 10/100 Fast Ethernet.
- UNIVERSAL COMPATIBILITY: Engineered to fit securely in all standard RJ45 ports. Provides the correct signal return for accurate diagnostics on unmanaged/managed switches and server hardware.
- COMPACT & DURABLE: Built for the IT tool bag. Features a solid molded PVC housing and gold-plated contacts to ensure a corrosion-free connection for years of daily use.
- LIFETIME WARRANTY: Backed by the Networx Lifetime Warranty. Ideal for Network Engineers, Sysadmins, and Installers.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00E4OKGDE |
| Best Sellers Rank | #49,592 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #91 in Network & Cable Testers |
| Customer Reviews | 4.4 4.4 out of 5 stars (365) |
| Date First Available | January 1, 2004 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.96 ounces |
| Item model number | LB-GB45S |
| Manufacturer | Networx™ |
| Product Dimensions | 3.56 x 3.25 x 0.78 inches |

## Product Details

- **Brand:** Networx®
- **Color:** Blue
- **Compatible Devices:** PC
- **Connector Type:** RJ45
- **Item dimensions L x W x H:** 3.56 x 3.25 x 0.78 inches

## Images

![Networx® Gigabit RJ45 Loopback Tester - 10/100/1000Base-T Network Port Validator - Ethernet Diagnostic Tool for Switches and Server NICs - Image 1](https://m.media-amazon.com/images/I/61VutD5kpYL.jpg)
![Networx® Gigabit RJ45 Loopback Tester - 10/100/1000Base-T Network Port Validator - Ethernet Diagnostic Tool for Switches and Server NICs - Image 2](https://m.media-amazon.com/images/I/61XkEDwYQ1L.jpg)
![Networx® Gigabit RJ45 Loopback Tester - 10/100/1000Base-T Network Port Validator - Ethernet Diagnostic Tool for Switches and Server NICs - Image 3](https://m.media-amazon.com/images/I/61hTbZ-SXWL.jpg)
![Networx® Gigabit RJ45 Loopback Tester - 10/100/1000Base-T Network Port Validator - Ethernet Diagnostic Tool for Switches and Server NICs - Image 4](https://m.media-amazon.com/images/I/61uQAgk0cmL.jpg)
![Networx® Gigabit RJ45 Loopback Tester - 10/100/1000Base-T Network Port Validator - Ethernet Diagnostic Tool for Switches and Server NICs - Image 5](https://m.media-amazon.com/images/I/716oy2Nyo5L.jpg)

## 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: Does this work on non-gigabit connections as well?**
A: Yes, this adapter is backwards compatible with non-gigabit connections.

## 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!

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ 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.

## Frequently Bought Together

- Networx® CAT6 Gigabit RJ45 Loopback Tester
- LC/UPC Fiber Optic Circuitors Connector SM & MM Loopback Adapter Interface Signal Loop (LC/UPC SM-9/125)

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*Product available on Desertcart Nicaragua*
*Store origin: NI*
*Last updated: 2026-01-26*