A cross-connection apparatus for B-ISDN.

摘要

A cross-connection apparatus for B-ISDN includes plural interface units (10-1 to 10-N), multiplexers (11-1a to 11-Na), virtual path identifier (VPI) conversion tables (12-1 to 12-N), demultiplexers (11-1b to 11-Nb), and loop-back units (20-1 to 20-N) and a switch unit (13). The interface unit has a reception port (10a) for receiving an ATM cell or inserting a monitor cell, and a transmission port (10b) for transferring the ATM cell or extracting the monitor cell. The multiplexer (11-1a) is operatively connected to corresponding interface unit (10-1) for multiplexing the monitor cell. The VPI conversion tables (12-1) are operatively connected to corresponding multiplexer (11-1a) for converting the VPI to change a transmission route of the monitor cell: The switch unit (13) is operatively connected to the VPI conversion tables (12-1 to 12-N) for switching the transmission route of the monitor cell based on the VPI. The demultiplexer (11-1b to 11-Nb) is operatively connected to the switch unit (13) for demultiplexing the monitor cell and transferring the monitor cell to the transmission port. The loop back unit (20-1) is operatively connected to corresponding interface unit (10-1) for changing the transmission route so as to transfer the monitor cell to the same interface unit which the monitor cell is inserted, and as a result, the apparatus can be monitored by comparing the inserted monitor cell with the extracted monitor cell in the same interface unit. <IMAGE>