Implementation of Switching System for 16 User Using VHDL

Abstract

switching system is used for data transmission between two communicating Channels. This transmission can be either via trunks (Landline) or it can be completely wireless, technically termed as Telephone Switching and Mobile switching, respectively. We report the implementation of a switching system using very high speed integrated circuit hardware description language (VHDL) which is more reliable and efficient than the present switching system. It converts entire bulky switching unit which consists of routers, multiplexers, decoders, counters in to a single integrated circuit (IC). Simulation results are presented for transfer of data from input subscriber to the output subscriber using sequential write /random read mode with the timing diagram. To verify the transfer of data from input subscriber to the output subscriber a 32 bit op-code is assumed in which each bit represents a specific function.

In this thesis we work on Landline Switching for two different channels using VHDL each channel have 16 users. They can communicate either intra channel or inter channel. We are also providing Caller ID facility in our work. In this work, the data coming in through the inlets are written into the data memory and later read out to the appropriate outlets. The incoming and out coming data is usually in serial form whereas the data are written into and read out of the memory in parallel form. It therefore becomes necessary to perform serial to parallel conversion and parallel to serial conversion at the inlets and outlets respectively. We are using 32 bit Opcode for communication between these channels or with in the channel. In this work we can define all the functions by Opcode. Opcode is responsible for caller id also and which data we are going to transmit or receive. We implement our work by Xilinx ISE i.e. responsible for synthesis also. For simulation we are using Modelsim 10.2a.