Apparatus for interfacing between mobile switching center and interworking function unit

摘要

An apparatus for interfacing between a mobile switching center (MSC) and an inter working function unit (IWF), comprising an inter-system link protocol (ISLP) processing part for processing a plurality of subhighway (SHW) data inputted respectively through SHWs in the unit of subscribers according to an ISLP. The ISLP processing part further separates data transferred over a given channel of an E1 trunk from the IWF according to the SHWs and their time slots and transfers the separated data respectively to the subscribers. A dual port random access memory (RAM) stores the subscriber-unit data processed by the ISLP processing part in the unit of channels or the data transferred over the given E1 trunk channel from the IWF in the unit of the subscribers. A frame relay protocol processing part extracts only a plurality of actual subscriber data from the channel-unit data stored in the dual port RAM, processes the extracted actual subscriber data according to a frame relay protocol, assigns the processed actual subscriber data to a specific channel of the E1 trunk and transfers them to the IWF. The frame relay protocol processing part further extracts respective subscriber data from the data transferred over the given E1 trunk channel from the IWF and stores the extracted subscriber data in the dual port RAM in the unit of the subscribers.