(57) add / drop multiplexer node 110 in the [summary] optical network includes an optical channel selection switch 226. The switch can operate in bar and cross states, and the input 228 of the first receiving (λ1, λ2, λl ... λk, λN) light multiplexing channel, the line to be associated with the node 110 to Adding: channel the output 244 of the first is connected to the input 248 of the second is connected to the output 246 of the terminal device 112, the line terminal equipment input 242 for dropping channels and is a bar connected to the input 228 of the first and I have an output 236 of the second bar, which is connected to the input 248 of 2. A predetermined number of channels to be dropped (λl ... λk) is selected, the channel selection switch 226 is connected to the output cross 236 of the first 2 (λ1, λ2, λN) non-selective channel from the input 228 of the first .
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