11/7/2022 0 Comments Loopback cable color coding| gigether-options] hierarchy level, places the interface into Interfaces interface-name (fastether-options Simply including the loopback statement at the [edit There is no option to use a local or remote statement. On anĮthernet interface, you cannot create a remote loopback, therefore Of the PIC but does not test the transmit and receive ports. A local loopback tests the interconnection When you create a local loopback, you create an internal loop In configuration mode, go to the following hierarchy level: edit interfaces interface-name (fastether-options | gigether-options)Ĭonfigure the local loopback: [edit interfaces interface-name (fastether-options | set loopbackįor example: [edit interfaces fe-1/0/0 showįor example: [edit interfaces fe-1/0/0 commit The transmit port to the receive port, follow these steps: To configure a local loopback without physically connecting Perform Steps 2 through 8 from Diagnose a Suspected Hardware Problem with a Fast Show interfaces (fe- fpc/pic/port | ge- fpc/pic/port ) extensive Interface (fe- fpc/pic/port | ge- fpc/pic/port count 100 rapidĬheck for Fast Ethernet or Gigabit Ethernet Interface Ping the Fast Ethernet or Gigabit Ethernet Interface Interface-name unit logical-unit-number family inet addressĬlear Fast Ethernet or Gigabit Ethernet InterfaceĬlear interfaces statistics fe- fpc/pic/port | ge- fpc/pic/port Show interfaces ge- fpc/pic/port [edit interfaces Show interfaces (fe- fpc/pic/port | ge- fpc/pic/port)Ĭonfigure a Static Address Resolution Protocol Table Verify That the Fast Ethernet or Gigabit Ethernet Interface-name (fastether-options | gigether-options)] If it doesn't work, you've either built it wrong or the CSU/DSU isn't working properly.For Using Loopback Testing for Fast Ethernet and Gigabit Ethernetĭiagnose a Suspected Hardware Problem with a FastĬreate a Physical Loopback for a Fiber-Optic InterfaceĬonnect the transmit port to the receive port.Ĭreate a Loopback Plug for an RJ-45 Ethernet InterfaceĬross pin 1 (TX+) and pin 3 (RX+) together, and pin 2 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). 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. 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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