--- 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: "65 zł" currency: PLN in_stock: true reviews_count: 8 category: "Networx®" url: https://www.desertcart.pl/products/8045411-networx-t1-e1-pri-loopback-tester-rj45-universal-pinout-pins store_origin: PL region: Poland --- # 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:** 65 zł **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?** 65 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/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. --- ## 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.pl/products/8045411-networx-t1-e1-pri-loopback-tester-rj45-universal-pinout-pins](https://www.desertcart.pl/products/8045411-networx-t1-e1-pri-loopback-tester-rj45-universal-pinout-pins) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-04-25*