Switching method without short break for atm transmission line and its circuit

Abstract

Abstract PURPOSE:To switch an ATM transmission line to an instaneous interruption with the processing at a reception side only by allowing the reception side to control a delay so that the content of a valid cell of an active transmission line and a valid cell of a standby transmission line is made coincident with each other. CONSTITUTION:Active cell buffers 41, 43 select only a valid cell in ATM cells sent from an active reception circuit 21, stores and delays it for a specific time. Similarly, standby cell buffers 42, 44 select only a valid cell in ATM cells sent from a standby reception circuit 22, stores and delays it for a specific time. Cell coincidence detection circuits 51-55 compare the content of the valid cell of the active reception signal with the content of the valid cell of the standby reception signal, revise the difference of the valid cells of the active reception signal and the standby reception signal so as to make the content coincident when the discordance of the contents is detected consecutively for a specific cell number or above. Then a system selective circuit 57 selects one of an output ATM cell of the active cell buffer and that of the standby cell buffer. Since no transmission/reception of control is required with a transmission side, instaneous interruption switching is attained also with respect to the reception signal of any kind of equipment.

Inventors

• 👤 Yukio Nakano
• 👤 幸男 中野
• 👤 Masahiko Takase
• 👤 晶彦 高瀬
• 👤 Masahiro Takatori
• 👤 高取　正浩
• 👤 Junichiro Yanagi
• 👤 柳　純一郎

Bibliographic Details