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Alcatel 1651 SM 622 Mbit/s (STM4) Synchronous Add Drop Multiplexer
The 1651 SM is and STM-4 Add-Drop Multiplexer, i.e. is a transmission system able to drop/insert a wide range of miscellaneous tributaries from/into two 622 Mbit/s bidirectional synchronous streams sent in two directions, E and W.
The tributaries can be both plesiochronous and synchronous, electrical and optical. The system can work as line terminal equipment, as line regenerator and Add-Drop Multiplexer, line protected or unprotected.