If it doesn't work, you've either built it wrong or the CSU/DSU isn't working properly. If it does, you've successfully built the plug. Place the loopback plug into the T1 port and you should see the unit "synch" to itself by indicating either "Link" or having whatever is used for the WAN interface to show the unit now has sync. Test it on a "known good" router with a CSU/DSU (T1 interface). better to crimp or solder for great connectivity. in this case you chop an ether net cable in half and twist, crimp or solder the wire from pin 2 to the wire coming out pin 4.on the same end.etc. except you attatch the wires to each other. Put the Cat 5 end into the crimper and verify all of the wires are pushed all the way into the pin slots and then crimp it down.ĩ. a physical loopback cable is made in the same way as a crossover cable. You should now have 2 wires "looped" in the cat 5 blank end with pin 1 connecting pin 4 and pin 2 connecting pin 5Ĩ. Put one end of the second wire into pin 2 and bend it in half and put the other end into pin 5.ħ. ![]() Put one end of the first wire (either one will do) into pin 1 and bend it in half and put the other end of it into pin 4.Ħ. If you are looking at it this way, the bottom slot is pin 1 and the top is pin 8.ĥ. Identify the pin order on the Cat 5 end: hold it with the movable/press-side of the clip away from you and the metal contacts facing left. ![]() usually same colors (brown and brown/white, etc.)Ĥ. Cut off about 2 to 4 inches of a Cat 5 cableģ.
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