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interconnected to a wired network, which forms the backbone for our wireless system Ask logical questions about the network outage, even if parenthetically Actually, if you ask the questions to yourself and then simply state the conclusion aloud, you may be seen as a wizard, rather than as a fool So, you might think, Gee, are all the wireless devices out of service, or only those in one area But you would say, Only the devices served by Bridge 3 are out of service, so let s check it out first Then, you can begin to check the LAN connection to the bridge, the W-NIC cards, the antenna, the coax, and even the power to Bridge 3 Line-of-Sight Problems Many of the problems with wireless LANs are caused by simple obstructions in the path from bridge to workstation You need to know if something has changed in that path For example, remodeling could add walls or shielding metal to the path Or, something as simple as a metal filing cabinet could have been moved in the way Look for simple things first, and determine if something has changed to make the signal strength marginal The easiest way to determine line-of-sight problems is to imagine the radio waves path from workstation to AP Remember that the signals can penetrate certain types of structures, although there is always a signal decrease when this happens Use any built-in signal level indicator in the wireless client software to help diagnose this issue You may add or move a range extender antenna at the workstation However, the antennas at the wireless AP should be relocated with caution, as their position affects the reception at all workstations Sometimes, a time-of-day problem may actually be a line-of-sight problem For example, a delivery truck might block signal from a nearby server In a few cases, you may actually be able to compensate for a line-of-sight problem with a reflector made from sheet metal or foil If all else fails, try to plot the signal path and experiment with reflectors from 2 to 4 ft square Radio waves bounce off a reflector much like light off a mirror, so place the reflector accordingly While almost any metal object will reflect the wireless LAN signal (or attenuate it from passing through), a highly conductive surface, such as a copper sheet, will work best If you are skeptical, simply take a close look at many of the microwave communication towers littering the landscape You may note that many of them actually have the transmitting dish mounted at ground level, pointed straight up to a reflector high up on the tower.

Where the reflections intersect each other or the main direct signal, signal distortion occurs More often than not, the reflected signal may be as strong or stronger than the direct signal Occasionally, a receiving station cannot see the transmitting station line-of-sight, and the reflection signal is the only one that the receiving station gets any transmitted signal from Multipath is not always bidirec-

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tional either It can affect the signal going one way differently than it affects it going the other Because signal paths, especially their reflections, can be random and not easily plotted or studied, multipath problems have few and only experimental trial-and-error solutions The root of the solution is to get one good, strong signal from the transmitter to the receiver The solution may be different for each signal direction, so the goal is to find a solution that works well in both directions of the signal path

int printf( const char *format, arg1, arg2, , argn);

Interference Many types of equipment can create interfering signals in the WLAN operating bands As stated before, these bands are shared with other services, and we must tolerate any interference that is deemed to be a legal use of the band In some cases, the interference may be significant because of the relative weakness of our desired signal (for example, from the bridge) The cure may be to add an extender antenna to the workstation, or to the bridge In severe cases, a directional antenna with a higher gain may be necessary Also, the application may simply require an addition of another AP bridge In rare cases, an improper level of interference may even be illegal You should be able to locate the source and measure the level of the interference with appropriate signal-strength equipment The same type of equipment that is used in a full site survey can also help locate these interference sources if you use a directional antenna for the tracking Typical sources of interference might be microwave ovens, microwave or radar transmissions, industrial heating and welding equipment, certain medical equipment, any digital equipment (such as a computer or a monitor), radio transmitters, and finally other WLANs Any device that emits RF energy in the frequency bands used by your WLAN is a potential culprit, whether the emission is intentional or not If you determine that it is improper, you can ask the owner of the interference source to correct its operation, or in extreme circumstances, you can take legal action to shut down the source Figure 139 shows several types of interference, as captured on a spectrum analyzer If the interference is from another WLAN, try changing the channel you are operating on The US band plan, for example, comprises 11 channels in the 24 Gbps band Most equipment defaults to Channel 1 or 6 Simply change all the default channel settings to another channel Note that this must be done in all the workstation W-NICs as well as those of the APs This brings up an interesting point IEEE 80211 allows a workstation to roam, that is, to scan for the best signal among the complement of channels Many suppliers lock the W-NIC into a default channel, so it will not inadvertently catch on another network with a good signal (what we might call a foreign network) Although the workstation would generally not be authorized on the foreign network, the W-NIC might stay on that channel and not be able to connect to its home network The safest practice is to determine exactly which channel you will operate on and set the bridge and workstations to use this particular channel Remember to check for this fault if a workstation inexplicably will not connect.

The function takes a pointer to the characters you wish sending to the standard output stream and zero or more items for formatting For instance consider the following printf statement

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