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When a Token-Ring network is initialized, one node on the ring is elected the Active Monitor This node is responsible for monitoring the passage of the token around the ring, deleting duplicate tokens if they occur, and generally making sure that everything runs smoothly The process of electing an Active Monitor is transparent to network users and to network administrators The show interface tokenring command will display the ring status as "initializing" if the router has just been connected to the ring This is because the router interface will need to be added into the sequence of computers to receive the token This process is referred to as the router interface "being inserted into the ring" If a hardware error has occurred, the show interface tokenring command will report an interface status of Reset The most common problems reported on token rings are incompatible ring speeds, ring beaconing conditions, source routing not enabled, or a large number of transitions Ring speeds can be set either to 4 Mbps or to 16 Mbps with the commands shown as follows Router1(config)#interface tokenring 0 Router1(config-int)#ring-speed 4 The default is 16 Mbps, and if the interface is changed to 4 Mbps with the command above, the interface speed can be changed back again with the ring-speed 16 configuration command The current ring speed setting is given in the screen display of the show interface tokenring command Ring beaconing occurs when a serious problem with a network component, such as the cabling, Multistation Access Unit (MSAU), or a node interface is detected As a token gets passed around a ring, each node receives the token from its Nearest ActiveUpstream Neighbor (NAUN) Should a node not receive a valid token from its NAUN, the node will report a beacon condition to all other stations on the network In theory, this should initiate an auto-reconfiguration process, whereby the suspect NAUN and node reporting the beacon are taken out of the ring and normal operation is restored for the rest of the ring I have rarely seen this work in practice If a serious problem exists and a node sends out beacon frames, the problem generally has to be fixed by manual intervention before the ring is operational again Source routing was discussed in detail in Chap 5 The show interface tokenring command display tells you whether the interface is configured for source routing The display will either indicate the interface is a single ring node or multi-ringnode Multi-ring nodes are enabled to collect and utilize RIF field information and therefore can participate in source routing This line also tells you the type of bridging for which the interface is enabled The interface whose show interfacetokenring command is displayed in Fig 8-11 is enabled only for transparent bridging and not for source route bridging For the commands needed to enable source route bridging on an interface, refer to the section on Chap 5 on source route bridging If transitions are reported on an interface, it indicates that the ring made a transition from an up to d t t i A ti ll i i t ft iti th t ith th i.

262 Common digital tests and measurements Measuring digital signal power Accurately measuring the power of wideband digital signals can be much more difficult than measuring the output power of most analog signals Normal analog CW wattmeters can be very inaccurate when utilized to measure the power of digitally modulated signals, which can have a peak-to-average power ratio of 10 dB or more Most analog modulation power meters were not calibrated to measure these types of wideband signals As the symbol rate of a digital signal increases, the bandwidth also increases, so the power in a digital signal is stretched across a very wide frequency range, and not localized around the center frequency of the carrier as in AM or FM modulation This means that a single power measurement, at a single location within the digital channel, taken with a spectrum analyzer will give a deceptively low power output measurement This is because the spectrum analyzer s maximum resolution bandwidth (RBW), its internal IF filtering, is actually narrower than the digital signal s own total bandwidth Any accurate method of measuring the output power on a spectrum analyzer would involve taking many discrete average power measurements of the digital signal over

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a down state, or vice versa A continually increasing count of transitions means that either the ring or the router interface are experiencing problems and you need to investigate cabling and hardware problems There are other commands that will give you information on Token-Ring packets, but little additional information is presented that will assist in the resolution of common problems When working with Cisco technical support, you may be required to note the displays given by the show controllers tokenring command, which gives information on the hardware interface and summary packet statistics The other command that sometimes is used is the debug tokenring command that identifies the MAC source and destination addresses for every packet that passes through the interface

its entire bandwidth, and then summing them together However, this is not necessary, as you will see below To precisely measure a digital signal s power, the bandwidth must first be found In order to measure the power as accurately as possible, the 30-dBdown points will be used instead of the normal 3-dB-down points normally adopted to indicate a signal s bandwidth (Fig 242) This will allow for most of the digital signal s power to be measured within its entire communication channel; any power below the 30-dB points can be discounted, and will generally be quite near the noise floor After we have obtained the signal s true bandwidth, we can then go about accurately measuring its average power level Most quality spectrum analyzers have the capability to make digital power measurements The procedure is 1 Find the power menu on your model spectrum analyzer 2 Select digital 3 Input the digital channel s center frequency 4 Input the digital channel s 30 dB bandwidth 5 The digital signal s true power will now be indicated on the spectrum analyzer s screen Another, slightly less accurate, technique is utilized by spectrum analyzers that do not possess the above automatic power measurement capabilities: 1 Measure the digital signal s bandwidth at the 30-dB-down points 30 dB bandwidth

Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website

59 59 60 61 61

In this section we'll cover two main areas First, we will look at troubleshooting general IP connectivity related to routing protocol issues Second, we'll examine basic troubleshooting for popular WAN protocols In both of these sections we will consider troubleshooting lost connectivity and poor performance

4 Decrease the analyzer s video bandwidth (VBW) setting to reduce the signal s displayed noise 5 Take the digital signal s power measurement with the spectrum analyzer s frequency/amplitude MARKER placed at the center of the signal 6 Now, find the true total average power of the digital signal by taking the power in dBm (as measured in step 5), and adding a bandwidth correction factor (BWCF): BWCF 10 log signal BW30 dB RBW

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