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Cisco multiplexor
Model: AS58-1STM1
Cisco - Multiplexor - 2 ports - plug-in module - STM-1
The SDH/STM-1 trunk card is a high density multiplex/demultiplex trunk card that demultiplexes the SDH/STM-1 trunk down to 1890 DS0 channels at 64 Kbps each. The SDH/STM-1 trunk card allows the Cisco AS5850 to interface to a SDH network at 155 Mbps with a single mode, intermediate reach fiber.