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)] This article originally appeared on Control Engineering Europe’s website.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 It may allow OT teams to fix the problem or at least cut down on the cost of repairs by eliminating the need to pay for diagnosis. But if something goes wrong down the road, troubleshooting the problem can be your first line of defense. The key to a worry-free cable plant starts with quality components and installation by a qualified installer, followed by certification testing. There are fault locators available that locally display the location of events such as severe bends, high-loss splices, breaks, and dirty connectors that can impact transmission. It may make sense to invest in a more sophisticated fault locator that bridges the gap between a VFL and an expensive optical time domain reflectometer (OTDR), which is a more complex troubleshooting tool that requires more skill to operate. A simple visual fault locator (VFL) will illuminate a fiber with a visible laser that will leak out where the fiber is broken or bent. There is also a chance that the fiber is bent or broken somewhere along the link. If dirt is visible the connector end face can be cleaned using wipes and solvents. One tool to have on hand is a basic fiber inspection camera that can reveal a dirty fiber end face at a connection point. Some inexpensive tools exist for dealing with typical problems. The most common cause of fiber-optic failures is contamination caused by dust or dirt on the endface of a fiber connector. A good qualification tester will indicate if the problem is related to noise issues.
End to end ethernet testing verification#
A qualification tester includes all of the verification functionality but is more sophisticated and can qualify cabling bandwidth on live Ethernet networks to determine if the cable supports the intended application. While verification is the first line of defense, if it is found that continuity is not the problem, qualification testing may be needed. Somewhat more sophisticated verification tools include a Time Domain Reflectometer (TDR), which indicates the distance to a cabling fault, greatly reducing troubleshooting time. Identifying the actual location of a fault along a length of copper cable can be easily achieved with an inexpensive tone and probe, which works by injecting a high harmonic signal onto a conductor that generates an audible noise at the fault location. Fortunately, verification testing using a simple, low-cost wiremap tool is an ideal solution. While the certification tester used for initial testing will conduct wiremap testing, few OT departments own these complex, expensive tools. Testing for continuity is accomplished with wiremap testing that looks for opens, shorts, reversed pairs, cross pairs, and split pairs. A non-functioning copper link is often a result of a lack of continuity caused by a cut or break in the cable or a bad termination process.
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