| Intelligent Networks (IN) are becoming increasingly attractive because of the services they can provide beyond the audio frequency communication now available within the "Plain Old Telephone Network (POTS)." The planning and designing of data networks in the past decade has prompted further study of the detailed network architecture. Design aspects of intelligent Networks have become specific during the past few years.; There is need to address, design, and create standards for call processing that are supported by an open architecture. Today's switch architecture uses channel units for the line equalization function on the incoming lines and trunks from the Public Switched Telephone Network. This information is forwarded into the proposed intelligent Networks. Such architectures inherit constraints that limit the adaptability of the switch. Different environments open new problems for the network functions. Any change in application and/or environment results in a hardware modification that is expensive. More often the remodification continues to inherent constraints in future developments.; In this dissertation, it is shown that the introduction of a processor which can be programmed to accommodate environmental changes, such as line dispersions and delays, is needed. Such a design provides an inexpensive way to make modifications to the system to adapt to different line and signaling conditions.; The studies are concentrated on the European Network environment and in specific, the British Telecommunication network. The major conclusions from this dissertation have been characterized in three distinct directions. The findings presented here are novel and yet unpublished for the European ISDN or Intelligent Networks. First, the physical, electrical, and transmission properties of the loops surveyed from the British Telecom environment are presented. Second, the capabilities of the loops surveyed from the areas of Britain to carry basic rate and primary rate ISDN data are investigated at different rates with various echo cancelers. The effects of changing the bit rates are also investigated. Individual loops that are categorized as the outlayers from the survey are studied further for their response to AMI and 2B1Q codes. Third, the software changes to the simulation model for the study of High Speed Digital Subscriber Line for carrying out the major simulations are also reported in this dissertation. |
