In this scenario 220-601 the analyser sits in the middle between the DTE and DCE. It is basically some device (e.g. a PC) with two serial interfaces. The analyser mirrors each signal from one site to the other site, and also displays the traffic.
In principle, a simple version of such an analyser can be built with any PC with two serial interfaces. All 220-602 that is needed is some software, which is not too difficult to write. Such a device will, however, lack a convenient feature. Professional analysers are able to auto-sense the speed of the serial communication. A home made solution needs to be configured to match the speed of the serial communication. Professional devices are also optimized to ensure minimal delay in the circuitry. Also, a simple homegrown, PC-based analyser can't be used to analyse faults due to signal voltage level problems. N10-003 Nevertheless, any kind of protocol analyser is much better than nothing at all. Even the most simple analyser is very useful.
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