| 摘要 |
PURPOSE:To eliminate the preparations of a exclusive channel for line connection information by re-writing a current line correspondence table memory to the contents of a spare line correspondence table memory when the changing contents returned from a facing device and the spare line correspondence table memory in its own device are coincident at plural times. CONSTITUTION:At a system 1, when a returned line connection request bit is '01' and the contents of a first register F-REG23 and the contents of a second register S-REG24 are coincident, the contents of a current line correspondence table memory C-MAP 21 are re-written to the contents of a spare line correspondence table memory S-MAP 22. At a system 2, when the contents when they are received by an arrow 30 and the contents when they are received by an arrow 50 are different, the contents of the register F-REG 23 and a line connection changing request bit are set to '10' as shown in an arrow 70 and returned to the system 1. Namely, only when the changing contents transmitted from the system 1 are the same contents as the first register F-REG 23, the contents of a current line memory C-MAP 21 are re-written.
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