North American mode primary group speed digital subscriber matching device

摘要

The present invention relates to a matching apparatus for matching an ISDN PABX and a North American type primary group speed digital subscriber, and a matching apparatus according to the present invention receives a synchronization frequency (FS) and a system frequency from a system switch of an exchange system A synchronous frequency generator for generating a frequency signal of 2.048 MHz and a frequency of 1.544 MHz and 24 B channels of 32 B channels and a PCM transmission line supplied from the switching system, A switching unit for converting the control data and the status information so that the MPU can process the signal and switching the 64-KHz signal channel required by the HDLC processing unit, and the North American coding process and the 24-frame alignment and CRC process An MPU unit for initializing each process and performing HDLC processing and L2 function and communicating with the upper processing unit L3; a memory unit for storing various programs and processing programs of the MPU unit; A common memory unit for storing various data, and a monitor matching unit for connecting a monitor for checking the state of the apparatus So that it is possible to match the ISDN PABX with the North American first-rate rate subscriber.