--- 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: "€ 16.98" currency: EUR in_stock: true category: "Networx®" url: https://www.desertcart.pt/products/8045411-networx-t1-e1-pri-loopback-tester-rj45-universal-pinout-pins store_origin: PT region: Portugal --- # Instant T-Carrier diagnostics Universal hardware loop on pins 1-4 & 2-5 Compact, rugged PVC design with gold contacts 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:** € 16.98 **Availability:** ✅ In Stock ## Summary > 🔧 Master your network with the ultimate T-Carrier loopback tester—because downtime is so last decade. ## 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?** € 16.98 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/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:** Rugged molded PVC with gold-plated contacts built to survive any job site hustle. - • **Hardware Loop Precision:** Force 'Link Up' status to isolate faults fast and keep your network flawless. - • **Universal Compatibility:** One tool, multiple standards—no adapters, no batteries, just pure efficiency. - • **Instant Circuit Verification:** Diagnose T1, E1, J1 & ISDN PRI lines in seconds—no wait, no guesswork. - • **Lifetime Warranty Confidence:** Invest once, test forever—Networx backs you with lifetime peace of mind. ## Overview The Networx T1/E1/PRI Loopback Tester is a professional-grade diagnostic tool designed for instant verification of T-Carrier circuits including T1, E1, J1, and ISDN PRI lines. Featuring a universal hardware loop on transmit and receive pairs (pins 1-4 and 2-5), it enables technicians to quickly isolate hardware faults on routers, CSUs, and Smartjacks. Its compact, durable PVC design with gold-plated contacts ensures reliable field use, all backed by a lifetime warranty for long-term confidence. ## 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, J1 (Japanese Standard), and ISDN PRI circuits without adapters or configuration. ## 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, E1, J1, 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 | #118,505 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #248 in Network & Cable Testers | | Brand Name | Networx | | Color | Blue | | Compatible Devices | PC, Laptop, Network Switch | | Customer Reviews | 4.4 4.4 out of 5 stars (59) | | Global Trade Identification Number | 00845425016546 | | Item Dimensions | 3.56 x 3.25 x 0.78 inches | | Manufacturer | Networx™ | | Measurement Type | Electrical Measurement Device | | Model | 845425016546 | | Number of Items | 1 | | Number of Packs | 1 | | Part Number | LB-T1E1S | | Power Source | Corded Electric | | Specification Met | [Est] Networx Brand Reputation & Product Purpose | | Style Name | T1 / E1 / PRI Loopback | | UPC | 845425016546 | ## Product Details - **Brand:** Networx - **Color:** Blue - **Item dimensions L x W x H:** 3.56 x 3.25 x 0.78 inches - **Power Source:** Corded Electric - **Style:** T1 / E1 / PRI Loopback ## 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) ## Available Options This product comes in different **Style** options. --- ## 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.pt/products/8045411-networx-t1-e1-pri-loopback-tester-rj45-universal-pinout-pins](https://www.desertcart.pt/products/8045411-networx-t1-e1-pri-loopback-tester-rj45-universal-pinout-pins) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-08-31*