| 摘要 |
In an SDH transmitting/receiving device having unitized redundantly configured transmitting/receiving sections (STM4W, STM4P), a multiplexing protection processing section (MSP), a redundantly configured time-slot exchange section (TSA), a unit switching processing section (UNITSW), and a channel section (D1CH), in addition to registers being provided in the multiplexing protection processing section and in the unit switching processing section, a signal line is provided between the multiplexing protection processing section and the unit switching processing section, whereby when performing an upgrade to a multiple-shelf configuration high transfer speed SDH transmitting/receiving device, a unit switching request is made to the multiplexing protection processing section and unit switching information is set into a register, and by making a mandatory switching request in the process of exchanging units, the unit switching information is transferred via the signal line to the unit switching processing section and the units are switched.
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