This will also have to be left for a future post. My best guess here is that it's used to test both ends of a modem connection (POTS). Once again, I couldn't find any information on its usage with a quick search. The RJ-11 plug is the same type of plug that is used for your telephone line. Since this is the only RJ-11 plug in the bunch, it should be pretty obvious as to when this should be used. But, I will have to leave that for another post. My best guess is that one is digital and the other is analog. Speed itself shouldn't determine the wire pinout. I did a quick search and couldn't find any information regarding the reason that one uses 1-4/2-5 and the other uses 1-7/2-8. I wish I could say that I knew the difference in usage between the T1 and 56K loopbacks. One wire loops from pin 1 to pin 7 and the other loops from pin 2 to pin 8. You can use it to replace either end of the cable that goes from the smart jack to the WIC card or CSU/DSU. One wire loops from pin 1 to pin 4 and the other loops from pin 2 to pin 5. And the (supposed) RJ-48 loopback plug that I have easily fits into the RJ-45 jack of my NIC card. To be honest, I'm sitting here looking at both and they look pretty similar. * RJ-48 has a keyed connector and a notched jack.Īlthough an RJ-45 connector will fit an RJ-48 jack, the key on an RJ-48 connector will prevent it from plugging into an RJ-45 jack.
What is the difference between RJ-48 and RJ-45? My intent with this post is to cover four loopback plugs:ĩ9-7912-042-1 RJ-48C T-1 Loopback Connectorĩ9-7912-043-1 RJ-48S 4W 56K Loopback Connectorĩ9-7912-044-1 RJ-11 2W 56K Loopback ConnectorĪC07-003376 RJ-45 Ethernet Loopback Connector
#CISCO LOOPBACK TEST ETHERNET SOFTWARE#
There are software loopbacks (which loops the functionality) and hardware loopbacks (which are intrusive, but more effective in isolating problems).Ĭisco has an excellent article on Loopback Tests for T1/56K Lines which covers hardware and software loopbacks. This sort of simulates "everything else" and can help to prove that a certain section of the network or device is/isn't working properly. The wire for the signal going out is looped back to the wire for the signal coming in so that it creates a loop. Loopback testing is used to isolate a problem to a certain section/device in a network. Take a complimentary Self-Assessment and learnĪbout Cisco certifications, training, and career opportunities.I have a number of loopback plugs in my little toolkit and I thought it might be useful to cover/discover the use of each. The demand for IT networking professionals continues to grow, and theĭemand for specialized networking skills is growing even more rapidly.
My workmate use Intel 82576 do the same test,and the loopback test is pass.Can you \ Parm: max_vfs:Maximum number of virtual functions to allocate per physical \ Parm: entropy:Allow igb to populate the /dev/random entropy pool (int) Vermagic: 2.6.32.45-0.3-default SMP mod_unload modversions Welcome to SUSE Linux Enterprise Server 11 SP1 (x86_64) - Kernel \r (\l).
#CISCO LOOPBACK TEST ETHERNET CODE#
My server’nic is Intel 82580,and the os is suse11sp1.When I do the nic self test use \Ĭommand “ethtool –t ethx”,the loopback test is fail,and the error code is 13,as \ I am an engineer of Huawei Technologies Co., Ltd,my name is Zhaobing.
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