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The Networx® Gigabit RJ45 Loopback Tester is a professional-grade Ethernet diagnostic tool designed to instantly verify network port activity and link status across 10/100/1000Base-T interfaces. Featuring a compact, durable design with gold-plated contacts, it loops all four wire pairs for accurate echo testing on switches, server NICs, and wall jacks. Universally compatible with all standard RJ45 ports and backed by a lifetime warranty, it’s an essential tool for network engineers, sysadmins, and IT installers aiming for seamless, reliable network troubleshooting.
| ASIN | B00E4OKGDE |
| Best Sellers Rank | #49,592 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #91 in Network & Cable Testers |
| Customer Reviews | 4.4 4.4 out of 5 stars (365) |
| Date First Available | January 1, 2004 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.96 ounces |
| Item model number | LB-GB45S |
| Manufacturer | Networx™ |
| Product Dimensions | 3.56 x 3.25 x 0.78 inches |
J**)
IMPORTANT TOOL for every network engineer.
It's basic, but it's necessary, and it works VERY well. Can't tell what switchport a wall port goes to? Throw on loopback detection on every port, plug this thing in, BOOM! Port identified! WAY easier than toning out cables!
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.
F**G
Good product, great for troubleshooting older ethernet devices
Many older devices without auto-negotiation of RX-TX pin positions need a crossover cable rather than a common straight-through cable. This makes it easy to swap without needing a separate crossover cable.
M**A
works
Works fine.
B**E
didn't work
simply didn't work.
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.
J**R
Does exactly what it claims.
Nice network diagnostic tool.
J**A
Still not entirely sure how it works.
I got no use out of this. I won't give it a bad review just for that, but it could be more clear as to what it does. I wanted to use it to test my home data jacks, but I guess it's really only made to test cables? I still don't get it.
T**Y
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!
R**Y
Perfect piece of kit for any data / network installer
Trustpilot
2 weeks ago
3 days ago