| 摘要 |
Disclosed is a remote supervisory system in which slave supervisory apparatus (S-SV) for supervising network elements can be polled from a master supervisory apparatus (M-SV), and yet each S-SV is able to send an alarm signal to the M-SV at any appropriate time. In this system, a first transmission path connected to the M-SV is connected via a switch to a second transmission path leading from each S-SV. The switch is controlled in accordance with the presence of a signal on the first transmission path and also with the presence of a signal on the second transmission path.
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