Design of telephone subscriber module

Bachelor`s thesis deals with analog subscriber telephone interface in modern telephone exchange and their possibilities of using for example in VoIP gateways. There are introduced electrical and physical parameters of analog subscriber interface in the thesis. Next part of the thesis contains a survey of modern integrate circuits for this interface. The older microelectronic circuits for an explanation functioning of integrate circuit for subscriber interface (SLIC). The main part of the thesis is focused on characteristics of circuit Si3220. This circuit is utilized for plug-in submodule design with two subscriber interfaces, what will be a part of modular multi-line subscriber module. This subscriber module will have up to thirty subscriber lines. The thesis includes the scheme of plug-in submodule and technological data for printed circuit board of technology SMD mounting