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Cable Testers, TDRs, and OTDRs
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The vast majority of cabling problems take place when the network is first installed or when a change takes place Once a cable has been made, installed, and tested, the chances of it failing are pretty small compared to all of the other network problems that might take place Imagine what happens when you can t connect to a resource and ask yourself, Is there a chance the cable is bad Broken cables don t make intermittent problems, and they don t slow down data They make permanent disconnects Network techs define a broken cable in numerous ways First, a broken cable might have an open circuit, where one or more of the wires in a cable simply don t connect from one end of the cable to the other The signal lacks continuity Second, a cable might have
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a short, where one or more of the wires in a cable connect to another wire in the cable (Within a normal cable, none of the wires connect to another wire) Third, a cable might have a wire map problem, where one or more of the wires in a cable don t connect to the proper location on the jack or plug This can be caused by improperly crimping a cable, for example Fourth, the cable might experience crosstalk, where electrical signal bleeds from one wire pair to another, creating interference Fifth, a broken cable might pick up noise, spurious signals usually caused by faulty hardware or poorly crimped jacks Finally, a broken cable might have impedance mismatch Impedance is the natural electrical resistance of a cable When cables of different types think thickness, composition of the metal, and so on connect and the flow of electrons is not uniform, this can cause a unique type of electrical noise, called an echo EXAM TIP The CompTIA Network+ objectives use the term open impedance mismatch (echo) at the time of this writing Imagine that there s a comma after open so you know you re looking at two different types of broken cable issues Network technicians use three different devices to deal with broken cables Cable testers can tell you if there s a continuity problem or if a wire map isn t correct (Figure 15-1) Time domain reflectometers (TDRs) and optical time domain reflectometers (OTDRs) can tell you where a break is on the cable (Figure 15-2) A TDR works with copper cables and an OTDR works with fiber optics, but otherwise they share the same function If a problem shows itself as a disconnect and you ve first checked easier issues that would manifest as disconnects, such as loss of permissions, an unplugged cable, or a server shut off, then think about using these tools
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Figure 15-1 Typical cable tester
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Figure 15-2 An EXFO AXS-100 OTDR (photo courtesy of EXFO)
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Certifiers test a cable to ensure that it can handle its rated amount of capacity When a cable is not broken but it s not moving data the way it should, you turn to a certifier Look for problems that cause a cable to underperform A bad installation might increase crosstalk, attenuation, or interference A certifier can pick up an impedance mismatch as well Most of these problems show up at installation, but it s never a bad idea to run a certifier to eliminate cabling as a problem Don t use a certifier for disconnects, only slowdowns Last, all certifiers need some kind of loopback on the other end of the cable run
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Networks need the proper temperature and adequate power, but most network techs tend to view these issues as outside of the normal places to look for problems That s too bad, because both heat and power problems invariably manifest themselves as intermittent problems Look for problems that might point to heat or power issues: server rooms that get too hot at certain times of the day, switches that fail whenever an air conditioning system kicks on, and so on You can use a voltage event recorder and a temperature monitor to monitor server rooms over time to detect and record issues with electricity or heat, respectively They re great for those something happened last night types of issues
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