---
product_id: 8045411
title: "Networx T1 / E1 / PRI Loopback Tester - RJ45 Universal Pinout (Pins 1-4 and 2-5) - Circuit Verification for Router CSUs and Smartjacks"
brand: "networx®"
price: "Bs.237"
currency: BOB
in_stock: true
reviews_count: 8
category: "Networx®"
url: https://www.desertcart.bo/products/8045411-networx-t1-e1-pri-loopback-tester-rj45-universal-pinout-pins
store_origin: BO
region: Bolivia
---

# Instant T-Carrier diagnostics Universal hardware loop on pins 1-4 & 2-5 Lifetime warranty protection Networx T1 / E1 / PRI Loopback Tester - RJ45 Universal Pinout (Pins 1-4 and 2-5) - Circuit Verification for Router CSUs and Smartjacks

**Brand:** networx®
**Price:** Bs.237
**Availability:** ✅ In Stock

## Summary

> 🔧 Loop in flawless connectivity — don’t let your network miss a beat!

## Quick Answers

- **What is this?** Networx T1 / E1 / PRI Loopback Tester - RJ45 Universal Pinout (Pins 1-4 and 2-5) - Circuit Verification for Router CSUs and Smartjacks by networx®
- **How much does it cost?** Bs.237 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/products/8045411-networx-t1-e1-pri-loopback-tester-rj45-universal-pinout-pins)

## 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

- • **Field-Ready Durability:** Compact, molded PVC design with gold-plated contacts built for rugged telecom environments.
- • **Hardware Loop Precision:** Creates a physical loop on transmit/receive pairs to isolate faults instantly.
- • **Universal Compatibility:** Works natively with ANSI T1.403, E1, and ISDN PRI—no adapters or batteries needed.
- • **Lifetime Warranty Assurance:** Invest once, test forever with Networx’s industry-leading lifetime warranty.
- • **Instant Circuit Verification:** Diagnose T1, E1 & ISDN PRI lines in seconds with zero setup.

## Overview

The Networx T1/E1/PRI Loopback Tester is a compact, plug-and-play diagnostic tool designed for telecom pros to instantly verify and isolate faults on T-Carrier circuits. Compatible with T1, E1, and ISDN PRI standards, it features a hardware loop on critical pins, durable gold-plated contacts, and comes backed by a lifetime warranty—making it an essential, reliable asset for any network technician’s toolkit.

## Description

Instant Circuit Verification for T-Carrier Lines. The Networx T1/E1 Loopback Tester is the industry-standard diagnostic tool for telecommunications circuits. It creates a hardware loop on the primary Transmit and Receive pairs (Pins 1-4 and 2-5), allowing technicians to force a "Link Up" status and isolate hardware faults on Routers, CSUs, and Smartjacks. A single tool for multiple interfaces, it is natively compatible with T1, E1, and ISDN PRI circuits without adapters or configuration.

Review: Simple and good insurance all will work fine. Good craftsmanship. - worked flawlessly. I was instructed to build a cord, but didn't want to take a chance. This was cheap insurance it was done right. Keep one in your arsenal.
Review: So easy and convenient to install. - So easy and convenient to install.

## Features

- INSTANT T-CARRIER DIAGNOSTICS: The industry-standard diagnostic tool for telecommunications circuits. Verifies circuit integrity on T1, E1, and ISDN PRI lines.
- HARDWARE LOOP: Creates a physical loop on the Transmit and Receive pairs (Pins 1-4 and 2-5), allowing technicians to force a "Link Up" status and isolate hardware faults on Routers and CSUs.
- UNIVERSAL PINOUT: Natively compatible with T1 (ANSI T1.403), E1, and ISDN PRI standards without the need for configuration or batteries.
- FIELD READY: Compact, molded PVC design with gold-plated contacts. Essential for testing Smartjacks and demarc extensions.
- LIFETIME WARRANTY: Backed by the Networx Lifetime Warranty.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00E4OKJKY |
| Best Sellers Rank | #272,268 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #547 in Network & Cable Testers |
| Brand | Networx® |
| Color | Blue |
| Compatible Devices | PC, Laptop, Network Switch |
| Connector Type | RJ45 |
| Customer Reviews | 4.4 out of 5 stars 91 Reviews |
| Global Trade Identification Number | 00845425016546 |
| Item Dimensions | 3.56 x 3.25 x 0.78 inches |
| Item Height | 0.78 inches |
| Item dimensions L x W x H | 3.56 x 3.25 x 0.78 inches |
| Manufacturer | Networx™ |
| Model Number | 845425016546 |
| Number of Ports | 1 |
| Package Quantity | 1 |
| Power Plug Type | No Plug |
| UPC | 845425016546 |
| Warranty Type | Lifetime |

## Product Details

- **Color:** Blue
- **Item dimensions L x W x H:** 3.56 x 3.25 x 0.78 inches
- **Brand:** Networx®
- **Item Package Quantity:** 1
- **UPC:** 845425016546

## Images

![Networx T1 / E1 / PRI Loopback Tester - RJ45 Universal Pinout (Pins 1-4 and 2-5) - Circuit Verification for Router CSUs and Smartjacks - Image 1](https://m.media-amazon.com/images/I/715OdYJ0XyL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Simple and good insurance all will work fine. Good craftsmanship.
*by S***P on March 8, 2025*

worked flawlessly. I was instructed to build a cord, but didn't want to take a chance. This was cheap insurance it was done right. Keep one in your arsenal.

### ⭐⭐⭐⭐⭐ So easy and convenient to install.
*by T***N on November 16, 2025*

So easy and convenient to install.

### ⭐⭐⭐⭐⭐ T1/E1
*by S***O on June 7, 2024*

WORKS AWESOME AND VERY TIME EFFICIENT.

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**Shop now:** [https://www.desertcart.bo/products/8045411-networx-t1-e1-pri-loopback-tester-rj45-universal-pinout-pins](https://www.desertcart.bo/products/8045411-networx-t1-e1-pri-loopback-tester-rj45-universal-pinout-pins)

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*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-02-22*