| 摘要 |
PURPOSE:To obtain a digital interface device which is applicable to both an R2 digital version signal and a comman line signal by doubling the capacities of decoders of the frame counters of a transmit signal insertion control circuit and a receive signal extraction control circuit. CONSTITUTION:Outputs of a 256 bit counter and a 16-bit counter which synchronize with station frames obtained by a station-side frame counter FCNT1 and a station-side multiframe counter MFCNT2 are inputted to terminals A0-A9 of a station-side frame counter decoder FDEC4. A signal which sets an R2 digital version (R2DVS) signal system or a common line signal system is inputted to a terminal and the device is made usable for both systems. A selector 5 assign 1K words of 2K word data of the FDEC4 to the R2DVS signal system and the remmaining 1K words to the common line signal system. Then 1K words each is assigned to a reception signal extracting circuit which is not shown in a figure. Consequently, one device is applicable to the two functions. |
