| 摘要 |
<p>In a telecommunications network a level of redundancy is often provided so that in the event of a circuit failure a back-up route may be used. This invention relates to a telecommunications network in which automatic switching of telecommunications traffic to backup circuits is provided when faults are detected on a traffic carrying circuit. In particular, when dedicated private circuits develop faults, this invention provides a network in which automatic switching of traffic to a dedicated back-up circuit takes place. A telecommunications network according to this invention includes monitoring means which is arranged to monitor particular points on incoming and outgoing circuits of a switch. Faults at particular points result in autonomous switching of traffic to a dedicated back-up circuit. Communication is facilitated between switches by using predetermined signals on the dedicated back-up circuit.</p> |
