| 摘要 |
<p>The system includes a network which has a number of nodes (N1,N2) connected by fibre optic cables (F1). Each node has an add-drop multiplexer (MO1,MO2) which inserts monitoring information and allows data transmission between nodes. A second associated multiplexer (ME1,ME2) operates an out-of-band offset wavelength transmitter (CS1,CS2) together with an offset wavelength adder (OF1,OF2). The offset signal is sent back to a central processor (T) where the same offsets are introduced (OS1,OS2) to interpret the information.</p> |
