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network - Test communication of interface using Cat5E loopback - Network Engineering Stack Exchange
How To Make an RS-232 Loopback Plug for a Cisco Adapter - Networkedminds
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Make your own Ethernet Loopback connector – TikkiWeb
CablesOnline 6-Pack 10/100 Ethernet Loopback Plug, Pinout 1-to-3, 2-to-6, Gray TS-UL01-6 : Electronics - Amazon.com
