专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US4835769A Passive bus communication for ISDN 失效
标题翻译： ISDN的被动总线通信
公开(公告)号：US4835769A
公开(公告)日：1989-05-30
申请号：US150130
申请日：1988-01-29
申请人： Norman J. Donaghue, Jr. , Jay P. Jayapalan , Rafael E. Salcedo
发明人： Norman J. Donaghue, Jr. , Jay P. Jayapalan , Rafael E. Salcedo
IPC分类号： H04Q11/04
CPC分类号： H04Q11/0471 , H04Q2213/13034 , H04Q2213/13174 , H04Q2213/13176 , H04Q2213/1319 , H04Q2213/13202 , H04Q2213/13204 , H04Q2213/13209 , H04Q2213/13216 , H04Q2213/1322 , H04Q2213/13299 , H04Q2213/204 , H04Q2213/216 , H04Q2213/22 , H04Q2213/299
摘要： An apparatus for providing passive bus communication in an ISDN without use of services of a central office includes a passive bus suitable for ISDN D-channel frame communication, the passive bus having an echo channel and having a plurality of terminal devices coupled to the passive bus. A receiving circuit is coupled to the passive bus for receiving D-channel frames containing a SAPI address transmitted from the terminal devices over the passive bus. A decoding circuit is coupled to the receiving circuit for decoding D-channel addresses transmitted from the terminal devices over the passive bus. The decoding circuit includes a circuit for determining if one of the D-channel frames from the terminal devices include a predetermined SAPI address. A switching circuit is coupled to and responsive to the decoding circuit, and implements a logical communication channel between two or more of the plurality of terminal devices when the D-channel frame includes the predetermined SAPI address. The switching circuit echoes D-channel frames over the echo channel of the passive bus for receipt by the terminal devices (TE) coupled to the passive bus and inhibits transmission of the D-channel frames to the central office when the D-channel frames include the predetermined SAPI address. The TE monitors the D-echo channel to receive the local passive bus communication in addition to contention resolution.
摘要翻译：一种用于在不使用中心局的服务的情况下在ISDN中提供无源总线通信的装置包括适用于ISDN D信道帧通信的无源总线，所述无源总线具有回波信道，并且具有耦合到被动总线的多个终端设备。接收电路耦合到无源总线，用于接收包含通过无源总线从终端设备发送的SAPI地址的D信道帧。解码电路耦合到接收电路，用于对通过无源总线从终端设备发送的D信道地址进行解码。解码电路包括用于确定来自终端设备的D信道帧中的一个是否包括预定SAPI地址的电路。切换电路耦合到解码电路并且响应于解码电路，并且当D信道帧包括预定的SAPI地址时，实现多个终端设备中的两个或更多个之间的逻辑通信信道。切换电路通过被动总线的回波通道回送D信道帧，以便由耦合到无源总线的终端设备（TE）接收，并且当D信道帧包括D信道帧时，禁止将D信道帧传输到中心局预定的SAPI地址。除了争用解决之外，TE监视D-echo信道以接收局部无源总线通信。

IPRDB

热门服务

关于我们

友情链接

联系方式