| 摘要 |
First and second independent communication systems are linked across an intersystem interface by a virtual circuit constituted by a land line linking the central stations of both systems. Occasionally both central stations may attempt to simultaneously use the virtual circuit, which cannot be done for digitized speech because in that case the virtual circuit operates as a simplex link. A method of resolving this conflict is disclosed, whereby one of the central stations is issued a token by the other entitling the holder of the token to use the virtual circuit. After the transaction is completed, the token is then returned. Two algorithms are disclosed, one based on the last user of a token giving it to the other user, and the other of which takes into account the number of registered secondary stations in each system.
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