| 摘要 |
PURPOSE: An ISDN subscriber access subsystem in a variable speed transfer system communication network is provided to carry out ISDN telephone communication not only in an Internet network but also other data networks using an ISDN subscriber access subsystem in a variable speed transfer system. CONSTITUTION: A line interface(110) executes a function to define the electrical characteristics of ISDN BRI(Basic Rate Interface) and PRI(Primary Rate Interface). An ADSL detection part(110) makes data service, other than ISDN channel service, achieved. A digital subscriber interface(120) executes a function to separate various channels. Among channel information separated through the digital subscriber interface(120), a channel control part(125) transmits data channel information to a full channel HDLC(High level Data Link Control Procedures) control part(145) and voice information for the other channels to a compression codecs(135,140). A memory part(130) stores information generated from a CPU(150) and billing/statistics-based information for data traffic. The compression codecs(115) compress or decompress voice information according to call quality. An HDLC control part(145) executes the layer-2 processing of all data transfer channels, including the D-channel signal provided from the channel control part(125). The CPU(150) executes a D-channel signal and data protocol processing function and a call processing management function. A communication control part(155) monitors system operation status or executes a communication function with an upper processor of the subscriber access subsystem(100). A switch ID control part(155) separates ADSL data from compressed voice information and executes a destination point communication path discrimination function. A variable speed switch interface(165) transmits and receives variable-speed data.
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