Hi Bernard,
I don't think that the shortness of the link has anything to do with it, unless output power levels are set wrong, and the receivers are set to the wrong sensitivity. Conceivably, this would cause them to be overdriven, with minor variations in power supply voltages.
Power line stability plays a dominant role in the integrity of the channel. Variations sometimes occur due to surges in power line distribution in elevator shafts and mechanical rooms (which, increasingly, tend to characterize the environment shared by wireless base station systems).
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There is a parameter known as a "dropout," which is the momentary loss of signal continuity for periods beyond a preset threshold.
Dropouts can be measured using standard transmission impairment measuring sets, or TIMS devices which are made by HP and a host of other mfgrs. to industry specs.
I have a question: How are the non-voice (i.e., the conventional data lines) such as 56/64 k's and 384 k's affected? Are they at the same time taking excessive errors, or are they running error-free? The answer to that question would give you a good starting point, for if the data lines are running error free, you could immediately discount the reasons I cited above.
I would not be so presumptuous to suggest that an anomaly such as this could be diagnosed on SI in this fashion. I'm only giving you some ideas as to where the problems may be originating. These types of problems do not tend to be exotic at their root, rather they are often the result of mundane conditions, such as the power surges I suggested.
Regards, Frank C. |
