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🔌 Plug into legacy network mastery — test smarter, not harder!
The Networx Fast Ethernet Loopback Tester (LB-RJ45S) is a compact, cost-effective diagnostic tool designed for verifying 10Base-T and 100Base-TX Ethernet ports on legacy network equipment. Featuring a durable molded PVC body with gold-plated contacts, it loops the Orange and Green wire pairs to confirm link status quickly and reliably. Optimized for Cat5e networks and backed by a lifetime warranty, this tester is an essential addition to any IT professional’s toolkit for fast, accurate port troubleshooting.
| ASIN | B00E4OKJ68 |
| Brand | Networx |
| Color | Blue |
| Compatible Devices | Router, Switch, Computer |
| Connector Type | Ethernet |
| Customer Reviews | 4.3 out of 5 stars 32 Reviews |
| Global Trade Identification Number | 00845425016522 |
| Item Dimensions | 2 x 1 x 0.75 inches |
| Item Weight | 18.14 g |
| Item dimensions L x W x H | 2 x 1 x 0.75 inches |
| Manufacturer | Networx™ |
| Mfr Part Number | LB-RJ45S |
| Model Number | LB-RJ45S |
| Number of Items | 1 |
| Number of Ports | 2 |
| Package Quantity | 1 |
| UPC | 845425016522 |
| Unit Count | 1 Count |
| Warranty Type | Lifetime |
J**A
Intended for IT
Very Good product and works as it it intended for. Just make sure you get the right one for the job. The Gig loopback is different from the RJ45. Although technically both are RJ45 structure, the internal wiring is different. These loopback are great for Analyst remoting-in and conducting their own company proprietary test on their machines.
C**N
A Test Kit Must
Having a reliable way to quickly to check for a port failure is a must. Doing a quick loopback test is a fast, easy way to check a port. I like the design of this device because all of the wires are tucked inside the body.
T**I
It works
There's a lot of bad reviews for this product, so I was hesitating to make a purchase. In the end, I decided to make a gamble purchase and I'm happy to say that I'm a lucky one. The products are working as expected and I don't need to request for any refund or anything else. There's nothing much to add for this review other than to share my experience.
W**N
Cannot get it to function as advertised
I purchased this item and the gigabit version. I have tried every combination of the item on the end of an Ethernet cable to directly plugging it in to the port on the switch. I never get the blinky lights. I have tried plugging in to a port that is functioning before I remove the Ethernet. Still nothing. Doesn't seem to work at all.
T**P
Comes up a little short.
Works as it should. I knocked off stars because of the loop for the keychain and difficulty activating the release. The loop got in the way of the release lever, making the plug difficult to remove. After I cut the loop off, things were easier, but still not a lot of space. I'll look for one that's a little longer next time.
R**N
Does not Work
No light indication of LAN connection at all. Do not waste your money. I used 3 months after receiving it. This is why not returned.
T**Y
Device Failed Its Test
Despite the warnings from other buyers and the fact that it is made in China, I bought the device. Unsurprisingly it did not work. A refund is on the way. Hopefully that will work as it is made in the USA!
Trustpilot
2 months ago
5 days ago