Patent ID: 6137778
Filing Date: 2000-10-24
Classification: H04J

Abstract:
A clock information transfer system for an ATM Adaptation Layer (AAL) type 1 transmission mode, comprising a plurality of ATM transmission devices connected to respective transmitting and receiving Asynchronous Transfer Mode (ATM) networks which operate with different network clock signals, and transmitting and receiving communication terminals for transmitting a Constant Bit Rate (CBR) signal therebetween via the ATM networks and the ATM transmission devices connected thereto, wherein said ATM transmission device of the receiving ATM network is connected to an input terminal of the receiving ATM network, and when said ATM transmission device of the receiving ATM network receives an ATM cell signal converted according to AAL type 1 from the transmitted CBR signal from the transmitting ATM network, said ATM transmission device of the receiving ATM network regenerates a clock signal of the transmitted CBR signal from the received ATM cell signal, generates Residual Time Stamp (RTS) information based on the regenerated clock signal and a network clock signal of the receiving ATM network which is different from a network clock signal of the transmitting ATM network, inserts the generated RTS information into said ATM cell signal at a predetermined position therein, multiplexes the ATM cell signal, and outputs the multiplexed ATM cell signal to said receiving ATM network, for thereby recovering the transmitted CBR signal and transmitting the transmitted CBR signal to said receiving communication terminal.