In this paper, we investigate the communication network performance and customer loyalty. A revision of performance parameters and measurement techniques is discussed. The main goal of this paper is to estimate the loyalty of Jordanian customers using questioner. Both mobile and Internet users were included in the case study. The results are useful for companies, who want to improve the provided Quality of Service (QoS) and also for users with different requirements to the communication networks.

In addition to compatibility with VLSI technology, sigma-delta converters provide high level of reliability and functionality and reduced chip cost. Those characteristics are commonly required in the today wireless communication environment. The objective of this paper is to simulate and analyze the sigma-delta technology which proposed for the implementation in the low-digital-bandwidth voice communication. The results of simulation show the superior performance of the converter compared to the performance of more conventional implementations, such as the delta converters. Particularly, this paper is focused on simulation and comparison between sigma-delta and delta converters in terms of varying signal to noise ratio, distortion ratio and sampling structure.