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    • 9. 发明授权
    • ISDN user-network interface system
    • ISDN用户网络接口系统
    • US5309440A
    • 1994-05-03
    • US940040
    • 1992-09-03
    • Hajime NakamuraHiroyuki KikutaFumio WatanabeMasanobu Fujioka
    • Hajime NakamuraHiroyuki KikutaFumio WatanabeMasanobu Fujioka
    • H04J3/06H04Q11/04
    • H04Q11/0471H04J3/0682H04Q2213/194H04Q2213/211H04Q2213/216H04Q2213/36
    • An ISDN-user-network interface system comprising an interface buffer and an interface adapter. The interface buffer provided between an ISDN network terminal equipment and a terminal equipment to receive an up-signal frame transmitted from said terminal equipment to said network terminal equipment, to store said up-signal frame, and to transmit said stored up-signal frame at a timing when said network terminal equipment is capable of detecting the synchronization of said up-signal frame. The interface adapter provided between said ISDN network terminal equipment and said terminal equipment, to receive an up-signal frame transmitted from said terminal equipment to said network terminal equipment, to detect D-channel bits of said up-signal frame, to transmit said up-signal frame to said network terminal equipment, to copy said detected D-channel bits into echo channel bits of a down-signal frame from said net-work terminal equipment to said terminal equipment received immediately after the transmission of said up-signal frame, and to transmit said down-signal frame to said terminal equipment.
    • 一种包括接口缓冲器和接口适配器的ISDN用户网络接口系统。 提供在ISDN网络终端设备和终端设备之间的接口缓冲器,用于接收从所述终端设备发送到所述网络终端设备的上行信号帧,以存储所述上行信号帧,并将所述存储的上行信号帧发送到 所述网络终端设备能够检测所述上行信号帧的同步的定时。 所述接口适配器设置在所述ISDN网络终端设备和所述终端设备之间,以接收从所述终端设备发送到所述网络终端设备的上行信号帧,以检测所述上行信号帧的D信道比特,以发送所述上行 对所述网络终端设备进行信号复制,将所述检测到的D信道位复制到从所述网络工作终端设备到所述上行信号帧发送之后立即接收到的所述终端设备的下行信号帧的回声信道位中, 并将所述下行信号帧发送到所述终端设备。