LOOPBACK Adapters - Plugs from PCCABLES.COM
Designed to Test Digital Signals on Computer by sending Data back to the Device. These Test Plugs are used to Test Port Functionality. They are usually used with software or terminal Applications to check port operations.
Ethernet RJ45 Loopback
Additional Loopback plugs are made for RJ45 Ethernet Cable Cat 5 Cat 6 Etc.
FiberOptic Loopback
Additional Loopback plugs are made for Fiber Optic Cable.
Making you own Ethernet Wiring an RJ45-M Loopback adapters : Comparable to Compaq 317465-001 Pinout: 1-3, 2-6