| 摘要 |
<p>PURPOSE:To shorten the communication impossible time of a terminal equipment generated in an accident generating time by using a public packet exchanging network in the bypass setting means of the accident time of the packet exchange of the packet exchanging network of a tree-shaped construction. CONSTITUTION:In a normal case, with routes 14 and 15 to pass through protocol converting devices 4 and 6 and packet switching devices 2 and 3, communication with a user center 1 is executed. Next, when the packet exchange 2, for example, is troubled by an accident, etc., the packet exchange 3 which is an alternative packet exchange retrieves its own data by a command, discriminates the protocol converting devices 4 and 5 connected to the packet exchange 2 and executes the setting processing of a communication path 17 via a public packet exchanging network 16 to the protocol converting devices 4 and 5. When the above-mentioned setting is completed, the alternative packet exchange 3 registers the protocol converting devices 4 and 5 on data and an accident detouring processing is finished.</p> |
