These are very easy to make and will save you a little bit of time and money in the long run. Remember: A T1 loopback plug is for T1 ports it will not work with Ethernet ports and vice versa. Take slot 1's end and place it into slot 3 and take slot 2's and place it into slot 6. Place a wire end into slot 1 and another into slot 2. The only thing that changes is the pin count. To make an Ethernet Loopback Plug do this:įollow the exact same steps above. I put masking tape on these wires just for easy handling when removing it from the port. So the short description is 1 to 4 and 2 to 5 and you will have about 6 inches of wire hanging out. Insert slot 1's other end into slot 4 and slot 2's into slot 5 and terminate or crimp the end. Insert one wire into slot 1 and the other wire into slot 2. The slots are numbered with the clip facing down towards your feet 1 - 8. I like to use the dark colors just so I can see where they are going in the RJ45 end. Usually it's blue, grey, yellow or green. They inadvertently crossed the tip and ring set and it was an easy fix.Ĭut about 1 foot cord of twisted pair and strip off the casing that holds all the pairs together. With the cable coming from the jack to the router it was red. I plugged in the loopback plug and the status was green. That was one part of the trouble shooting was to see if the T1 module on the router was operational. Loopback plugs are not only great for loopback tests, but they can save a little bit of time to see if a port is working without consoling in. In doing so I created loopback plugs on the fly to test the ports for connectivity. Well the one T1 was not working and I had to trouble shoot what was going on. There were two T1 lines that needed to be routed before the VLAN's could be configured. Ip route 10.10.30.0 other day I was installing a router and switch that needed to be trunked to a preexisting switch and a new firewall. Service timestamps log datetime msec localtime ! Last configuration change at 16:23:32 PST Thu Jan 28 2010 The result of last time isīERT is done on channel-group 0. (Far End Line Loopback with ESF BOC)īERT is in progress on channel-group 0. Router7008#bert controller t1 0/1 channel-group 0 pattern qrss interval 1 If you can put a T1 loopback plug at the end of the cable run, the ATLAS T1 port will clear the alarms if there is continuity from the transmit pair, to the loopback plug, and back on the receive pair. Here are my results running the test with a loopback plug: Ethernet uses pins 1, 2, 3, and 6 but T1 uses pins 1, 2, 4, and 5. I started by changing encapsulation of the serial interface 0/1:0 to hdlc, and sending remote loopback command from controller 0/1 (I have two dual T1 controllers - VWIC-2MFT-T1). ![]() I am confident that I am using the correct port (I have 4 T1s in an MLFR configuration, which works well). I am new to BERT, so I am not confident that I've set everything up properly. The equipment at the other end of the line seemed to successfully receive the loopback command and place itself into loopback mode. But even with a T1 loopback plug (shorted pins 1to4, 2to5) directly in the Cisco T1 port, I get 0 syncs (port shows carrier detect). I'm trying to run BERT on a Cisco on a line that I know is good (so I expect good BERT result).
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