| 摘要 |
To support a changing volume of voice-grade traffic in an access network having a local exchange with a limited capacity, there are proposed the following method. First, there are provided access networks each having its subscribers and its associated local exchange. Each of the access networks i s capable of dividing traffic, outgoing from its subscribers, into voice-grade and data traffic portions, and capable of directing the data traffic portion to a packet network while directing the voice-grade traffic portion to a PST N network via the associated local exchange. An overload condition is defined when traffic transmitted through a local exchange is equal or exceeds a predetermined threshold, while a normal load condition of the local exchange occurs when traffic is below the predetermined threshold. Upon detecting an overload condition in a local exchange (LE1), a search for another (LE2) loc al exchange that is in a normal load condition is conducted. Once found, the voice-grade traffic intended for local exchange LE1 is partially diverted an d transmitted to its destination via the packet network and the local exchange LE2, thereby reducing volume of the voice-grade traffic transmitted via LE1.
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