---
product_id: 55855271
title: "LC Fiber Optic Loopback Adapter - LC Singlemode 9/125 Tester Adapter - Blue"
brand: "yienfbev"
price: "2314 kr"
currency: ISK
in_stock: true
reviews_count: 8
category: "Yienfbev"
url: https://www.desertcart.is/products/55855271-lc-fiber-optic-loopback-adapter-lc-singlemode-9-125-tester
store_origin: IS
region: Iceland
---

# Ultra-low insertion loss ≤0.20dB for precision testing Bending insensitive Singlemode 9/125 fiber for reliable signal Duplex LC connectors for seamless pairing LC Fiber Optic Loopback Adapter - LC Singlemode 9/125 Tester Adapter - Blue

**Brand:** yienfbev
**Price:** 2314 kr
**Availability:** ✅ In Stock

## Summary

> 🔧 Test smarter, not harder — the pro’s choice for fiber loopback!

## Quick Answers

- **What is this?** LC Fiber Optic Loopback Adapter - LC Singlemode 9/125 Tester Adapter - Blue by yienfbev
- **How much does it cost?** 2314 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/55855271-lc-fiber-optic-loopback-adapter-lc-singlemode-9-125-tester)

## Best For

- yienfbev enthusiasts

## Why This Product

- Trusted yienfbev brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Plug & Play Simplicity:** Duplex clips hold connectors perfectly aligned for effortless insertion
- • **Built to Last Under Pressure:** Durability with ≤0.20dB change over 1,000 matings ensures long-term reliability
- • **Industry-Standard Compliance:** Meets Telcordia GR326 and RoHS for trusted, eco-friendly use
- • **Versatile Testing Powerhouse:** Optimized for R&D, telecom, FTTX, and patch panel applications
- • **Precision Tested for Peak Performance:** 100% functionally tested to guarantee flawless network diagnostics

## Overview

The LC Fiber Optic Loopback Adapter is a blue, duplex LC/UPC connector designed for singlemode 9/125 fiber testing. Engineered with bending insensitive fiber and ultra-low insertion loss (≤0.20dB), it ensures precise, repeatable diagnostics. Fully compliant with Telcordia GR326 and RoHS standards, this adapter is built for durability and versatility across R&D, telecom, and FTTX environments.

## Description

Fiber Loopback is designed to provide a media of return path for a fiber optic signal, typically it is used for fiber optic testing applications or network restorations and it is absolutely an economical solution for a number of fiber optic test applications.Specifications:Type: Loopback Module Test wavelength: 1,310 and 1,550nm Fiber: Bending insensitive Singlemode 9/125 Connector: LC/UPC Insertion loss: Typical: ≤0.20dB Maximum: ≤0.30dB Return loss: UPC: ≥50.0dB Repeatability: ≤0.10dB Interchangeability: ≤0.20dB Durability: ≤0.20dB typical change, 1,000 mating Operating temperature: -20 to +70 degrees Storage temperature: -40 to +85 degrees Applications:R&DFiber labsTelecom testingFTTX testingPatch panel applicationsEquipment interconnection

Review: Thanks - Great buy
Review: Good for what it is - I use these or short simplex cables frequently to verify far side cabling to routers/switches, and this takes up harly any space. I can rarely find someone to stand around and confirm they see red on the right jack at 2 or 3 in the afternoon, let alone at 2 or 3 AM. These are an easy way to make sure that the right strands ended up going to the right device/port. Expected port comes up on the far end, you're good to go. If not, investigate and make adjustments. Same as T1 loopback plug or ethernet loopback plug or whatever - they are all useful. I wish they would make better ferrule protectors for these, though, like a snap on cap.

## Features

- Standard Duplex LC connectors, Bending insensitive Singlemode 9/125 fiber
- Ease and accuracy of insertion as duplex clips hold connectors together
- 100% functionally tested guaranteeing performance and integrity
- Used in Singlemode 9/125 Fiber for Testing Application
- Meets the Telcordia and GR326 stander, all materials compliant with RoHS requirement.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0755K87P3 |
| Best Sellers Rank | #134,060 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #60 in Fiber Optic Connectors |
| Brand | YIENFBEV |
| Cable Type | Fiber Optic |
| Color | Blue |
| Compatible Devices | Modem |
| Connector Gender | Male-to-Female |
| Connector Type | LC |
| Customer Package Type | Coiled in protective tubing or sealed anti-static bag |
| Date First Available | July 19, 2017 |
| Indoor/Outdoor Usage | Indoor, Outdoor |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.25 ounces |
| Item model number | 742354861707 |
| Manufacturer | Comm cable |
| Model Name | LC Fiber Optic Loopback Adapter |
| Number of Items | 1 |
| Number of Pins | 2 |
| Outer Material | Cardboard |
| Package Dimensions | 5 x 3 x 0.5 inches |
| Recommended Uses For Product | R&D, fiber labs, telecom testing, FTTX testing, patch panel applications, equipment interconnection |
| Shape | Round |
| Special Feature | Data Transfer |
| Specification Met | RoHS |
| UPC | 742354861707 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** YIENFBEV
- **Cable Type:** Fiber Optic
- **Compatible Devices:** Modem
- **Connector Type:** LC
- **Special Feature:** Data Transfer

## Images

![LC Fiber Optic Loopback Adapter - LC Singlemode 9/125 Tester Adapter - Blue - Image 1](https://m.media-amazon.com/images/I/41e3Wyl7PZL.jpg)

## Available Options

This product comes in different **Size, Number Of Items** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Thanks
*by V***E on September 15, 2025*

Great buy

### ⭐⭐⭐⭐⭐ Good for what it is
*by B***P on September 16, 2020*

I use these or short simplex cables frequently to verify far side cabling to routers/switches, and this takes up harly any space. I can rarely find someone to stand around and confirm they see red on the right jack at 2 or 3 in the afternoon, let alone at 2 or 3 AM. These are an easy way to make sure that the right strands ended up going to the right device/port. Expected port comes up on the far end, you're good to go. If not, investigate and make adjustments. Same as T1 loopback plug or ethernet loopback plug or whatever - they are all useful. I wish they would make better ferrule protectors for these, though, like a snap on cap.

### ⭐⭐⭐⭐ It works as expected and does the job for testing without any issues.
*by Y***Y on January 13, 2026*

Nothing special, just a regular LC single-mode loopback adapter.

## Frequently Bought Together

- Comm cable LC Fiber Optic Loopback Adapter - LC Singlemode 9/125 Tester Adapter - Blue
- Networx® CAT6 Gigabit RJ45 Loopback Tester

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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-03-05*