公开(公告)号：US5930348A

公开(公告)日：1999-07-27

申请号：US822618

申请日：1997-03-20

申请人： Jean Regnier ,  Jean Choquette ,  Yvon Archambault

发明人： Jean Regnier ,  Jean Choquette ,  Yvon Archambault

IPC分类号： H04B3/38 ,  H04L12/56 ,  H04M7/00 ,  H04Q3/66

CPC分类号： H04Q3/0029 ,  H04M7/12

摘要： An "Intelligent" telecommunications network comprises a plurality of switching units interconnected by links and connected to a central computer unit by a data communication system. For dynamic routing of a call, a first switching unit responds to a destination address in a call to attempt a direct link to a neighboring switching unit and, in the event that the attempt is unsuccessful, issues to the central computer unit a message containing the destination address. The central computer unit uses the destination address to identify the unsuccessful link; (ii) updates a routing database to identify the link as unavailable; (iii) determines an alternative route for the call using a tandem node and (iv) compiles a return message including a network address for a tandem switching unit and transmits it to the first switching unit. The latter attempts to route the call via a link to the tandem unit which attempts to complete the call by a direct link to the destination switching unit. The tandem node switching unit also queries the central computer if it cannot complete the call by a direct link to the destination switching unit, whereupon the central computer will set to zero the idleness of the direct link which the tandem unit attempted and then determine an alternate route from the tandem unit to the destination, i.e. with the idleness factors of both direct links set to zero, resulting in an alternate route having three links.

摘要翻译： “智能”电信网络包括通过链路互连并通过数据通信系统连接到中央计算机单元的多个交换单元。 对于呼叫的动态路由，第一交换单元响应呼叫中的目的地地址以尝试与相邻交换单元的直接链路，并且在尝试不成功的情况下向中央计算机单元发送包含 目的地址。 中央计算机单元使用目的地址来识别不成功的链路; （ii）更新路由数据库以将链路识别为不可用; （iii）使用串联节点确定用于呼叫的替代路由，以及（iv）编译包括串联交换单元的网络地址的返回消息并将其发送到第一交换单元。 后者尝试通过链路将呼叫路由到串联单元，该单元尝试通过到目的地交换单元的直接链路来完成呼叫。 串联节点切换单元还可以通过直接到目标交换单元的链路完成呼叫来查询中央计算机，于是中央计算机将把串联单元尝试的直接链路的空闲度设置为零，然后确定替代 从串联单元到目的地的路由，即两个直接链路的空闲因子设置为零，导致具有三个链路的备用路由。