Method of Data Flow Control in AICPS.LiTE

摘要

PURPOSE: A method for controlling data flow in an AICPS.LiTE system is provided to increase the data throughput for each channel by using the LWM(Low Water Mark)/HWM(High Water Mark) threshold of a TNAB(Telephony Network Access Board) and the flow control message method of an NDPB(Network Data Processing Board) in the case of executing uploading service and downloading service in an AICPS.LiTE system. CONSTITUTION: A TNAB(301) consists of an E1 framer driver(303), a TDM switch driver(304), four UAM modules(305-308), a data receiving processing(311), a data transmitting processing(313), and an HDLC driver(315). The E1 framer driver(303) covers the processing of signals and data incoming from a trunk. The TDM switch driver(304) executes a data exchange function between the E1 framer driver(303) and the UAM modules(305-308). Each UAM module(305-308) having 30 receiving buffers(309) and 30 transmitting buffers(310) is in charge of a modem pool function for 1E1, 30 subscribers. The data receiving processing(311) receives data through a channel-by-channel mail box(312) from the UAM modules(305-308), executes PPP framing processing for the received data, and transmits the processed data to the HDLC driver(315). The data transmitting processing(313) receives data through a channel-by-channel queue(314) from the HDLC driver(315) and transmits the received data to the UAM modules(305-308). The HDLC driver(315) communicates with an NDPB(316) through an HDLC link. The data transmitting processing(313) executes data flow control by exchanging flow control messages with the NDPB(316) through the HDLC driver(315).