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IO-920 Variants
The IO-920 also houses an I/O connector through which MDI lines from the dual gigabit eth-
ernet controller are brought into the IO-920. Through multiplexers and demultiplexers, signals
from the on-board PHY and the baseboard Dual MAC (82546GB) can either be routed to the
PSB . The muxes are controlled from slowport through EPLD.
Two 1000Base-T PSB ( Single Slot Complex PSB Ethernet variant)
In this variant two of the MDI outputs are routed to the PSB.
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