![loopback plug to test an ethernet port loopback plug to test an ethernet port](https://www.china-tscom.com/uploads/image/20210512/09/lc-sc-loopback-4.jpg)
If the E1 is configured as a PRI you need to remove the pri-group before using the channel-group command.
#Loopback plug to test an ethernet port serial#
To run the loopback test on channelized E1s (PRI or CAS) we need to use the channel-group E1 controller command to create one or more serial interfaces mapped to a set of timeslots in the channelized E1. Use the write memory command to save your router configuration. Insert the plug into the port in question. Twist the wires from pins 9 and 8 together.Ĭomplete these steps to prepare for the extended ping test: Twist the wires from pins 2 and 15 together. Use wire cutters to cut a working DB-15 cable that is 5 inches long with a connector attached. Creating the Loopback Plug for E1 on DB-15Ĭomplete the following steps to create a loopback plug for E1 on DB-15: Refer to the document on RJ-45 cables for more information. With the metal pins facing toward you, and the cable hanging down, pin 1 is the left-most pin. The pins on an RJ-45 jack are numbered from 1 through 8.
![loopback plug to test an ethernet port loopback plug to test an ethernet port](https://i.ytimg.com/vi/aZw6pSaEtAA/hqdefault.jpg)
Twist the wires from pins 2 and 5 together. Twist the wires from pins 1 and 4 together. Use wire cutters to cut a working cable that is 5 inches long with a connector attached. Creating the Loopback Plug for E1 on RJ-45Ĭomplete the following steps to create a loopback plug for E1:
![loopback plug to test an ethernet port loopback plug to test an ethernet port](https://web3mantra.com/wp-content/uploads/2018/05/loopback-plugs.jpg)
If you are working in a live network, ensure that you understand the potential impact of any command before using it. All of the devices used in this document started with a cleared (default) configuration. The information presented in this document was created from devices in a specific lab environment. The information in this document is based on the software and hardware versions below. There are no specific prerequisites for this document. Before You Begin Conventionsįor more information on document conventions, see the Cisco Technical Tips Conventions. If a router passes a hardware loopback plug test, then the problem exists elsewhere on the line. The hardware loopback plug test is used to see if the router has any faults.