--- product_id: 163149025 title: "Networx ISDN BRI Loopback Tester - RJ45 S/T Interface (Pins 3-4 and 5-6) - Diagnostics for Legacy ISDN Circuits" brand: "networx" price: "NT$492" currency: TWD in_stock: true category: "Networx®" url: https://www.desertcart.tw/products/163149025-networx-isdn-bri-loopback-tester-rj45-s-t-interface-pins store_origin: TW region: Taiwan --- # Pocket-sized compact design ISDN BRI 2B+D specialized S/T interface loopback pins 3-4 & 5-6 Networx ISDN BRI Loopback Tester - RJ45 S/T Interface (Pins 3-4 and 5-6) - Diagnostics for Legacy ISDN Circuits **Brand:** networx **Price:** NT$492 **Availability:** ✅ In Stock ## Summary > 🔧 Stay ahead in legacy network diagnostics with precision and portability! ## Quick Answers - **What is this?** Networx ISDN BRI Loopback Tester - RJ45 S/T Interface (Pins 3-4 and 5-6) - Diagnostics for Legacy ISDN Circuits by networx - **How much does it cost?** NT$492 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/163149025-networx-isdn-bri-loopback-tester-rj45-s-t-interface-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 - • **Seamless S/T Loopback:** Loops RJ45 pins 3-4 and 5-6 for instant verification of circuit integrity on BRI PBX systems. - • **Gold-Plated Reliability:** Premium contacts guarantee consistent signal accuracy and long-term durability under daily use. - • **Plug & Test RJ45 Interface:** Standard RJ45 connector enables quick, hassle-free connection to ISDN S/T interface equipment. - • **Precision ISDN Diagnostics:** Engineered exclusively for ISDN Basic Rate Interface (2B+D) to ensure flawless legacy circuit testing. - • **Ultra-Portable Pocket Tool:** Compact, lightweight design fits effortlessly in your toolkit or pocket for on-the-go troubleshooting. ## Overview The Networx ISDN BRI Loopback Tester is a compact, gold-plated diagnostic tool designed exclusively for ISDN Basic Rate Interface (2B+D) circuits. It loops the S/T interface pairs (pins 3-4 and 5-6) via an RJ45 connector to verify circuit integrity on legacy ISDN deployments and BRI PBX systems. Lightweight and pocket-sized, it offers reliable, professional-grade testing for technicians working with legacy ISDN networks. ## Description Specialized Diagnostics for ISDN Basic Rate. The Networx ISDN BRI Loopback Tester is designed specifically for the ISDN Basic Rate Interface (2B+D). This specialized adapter loops the S/T interface pairs (Pins 3-6 and 4-5) to verify circuit integrity on legacy ISDN deployments. (Warning: This tool is strictly for ISDN BRI circuits and will NOT function on T1, E1, J1, PRI, or Ethernet lines). ## Features - SPECIALIZED ISDN DIAGNOSTICS: Designed specifically for the ISDN Basic Rate Interface (2B+D). NOT compatible with Ethernet, T1, E1, J1, or PRI circuits - S/T INTERFACE LOOP: Loops the S/T interface pairs (Pins 3-4 and 5-6) to verify circuit integrity on legacy ISDN deployments and BRI-interface PBX systems - POCKET SIZED DESIGN: A compact, durable diagnostic tool that fits easily in a technician's pocket for convenient portability and storage - GOLD PLATED CONTACTS: Ensures reliable signal transmission for accurate testing and long-lasting performance - RJ45 CONNECTOR INTERFACE: Features standard RJ45 connector for quick and easy connection to ISDN BRI S/T interface equipment and circuits ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00E4OKGRK | | Best Sellers Rank | #538,662 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1,018 in Network & Cable Testers | | Brand Name | Networx | | Cable Type | Loopback Tester | | Color | Blue | | Compatible Devices | PC | | Connectivity Technology | Ethernet | | Connector Type | RJ45 | | Global Trade Identification Number | 00845425016577 | | Indoor Outdoor Usage | Indoor, Outdoor | | Item Shape | Round | | Item Weight | 0.01 kg | | Manufacturer | Networx® | | Number of Items | 1 | | Number of Pins | 8 | | Other Special Features of the Product | Gold Plated Contacts, Compact Design, Lifetime Warranty | | Recommended Uses For Product | Professional and advanced home use for testing and troubleshooting ISDN (BRI) connections, checking for broken or shorted wires, and testing wall to switch connections | | Specification Met | Isdn Basic Rate Interface (2b+d), S/T Interface | | UPC | 845425016577 | | Unit Count | 1 Count | ## Product Details - **Brand:** Networx - **Cable Type:** Loopback Tester - **Compatible Devices:** PC - **Connector Type:** RJ45 - **Special Feature:** Gold Plated Contacts, Compact Design, Lifetime Warranty ## Images ![Networx ISDN BRI Loopback Tester - RJ45 S/T Interface (Pins 3-4 and 5-6) - Diagnostics for Legacy ISDN Circuits - Image 1](https://m.media-amazon.com/images/I/61L-V49tbKL.jpg) ![Networx ISDN BRI Loopback Tester - RJ45 S/T Interface (Pins 3-4 and 5-6) - Diagnostics for Legacy ISDN Circuits - Image 2](https://m.media-amazon.com/images/I/71HNQEcT3nL.jpg) ![Networx ISDN BRI Loopback Tester - RJ45 S/T Interface (Pins 3-4 and 5-6) - Diagnostics for Legacy ISDN Circuits - Image 3](https://m.media-amazon.com/images/I/61ts9XStUpL.jpg) ![Networx ISDN BRI Loopback Tester - RJ45 S/T Interface (Pins 3-4 and 5-6) - Diagnostics for Legacy ISDN Circuits - Image 4](https://m.media-amazon.com/images/I/61mHFnAVLLL.jpg) ![Networx ISDN BRI Loopback Tester - RJ45 S/T Interface (Pins 3-4 and 5-6) - Diagnostics for Legacy ISDN Circuits - Image 5](https://m.media-amazon.com/images/I/61D+6kCak-L.jpg) --- ## 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.tw/products/163149025-networx-isdn-bri-loopback-tester-rj45-s-t-interface-pins](https://www.desertcart.tw/products/163149025-networx-isdn-bri-loopback-tester-rj45-s-t-interface-pins) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-08-24*