If it does, you've successfully built the plug. This test transmits a bit pattern and listens for the same bit pattern to be received, comparing the results. 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. Pattern loopback test (patlooptest) can be used to test ports on any of Digiums E1/T1 digital interface cards. Cut away two inches of the main sheath covering the eight wires. Cut 4 or 5 inches of the end off a network cable, keeping the connector intact. Test it on a "known good" router with a CSU/DSU (T1 interface). To build this particular loopback connector you will need one (1) spare Category 5e (cat5) cable.
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. 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. His friend has done it in the past but I am clueless. he want to trick the computer into thinking its connected to a network/server.
For example, a loopback device may be attached directly to a computers. Performing a loopback test is generally a multi-step process. Technicians use this method to quickly test whether data ports, cables and connections are working.
#How to make a t1 loopback cable how to#
Put one end of the second wire into pin 2 and bend it in half and put the other end into pin 5.ħ. My dad is asking me how to make a network loopback cable. Loopback testing is commonly performed on serial, network and telephone links. 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.