http://www.alliedtelesis.com/media/data ... cr1_ds.pdf
The AT-MCR1 is a single slot, rack-mountable
chassis, capable of housing any of the range of
Fast Ethernet and Gigabit Media Converters
and Bridging Media Converters.
standalone Media Converters and Bridging
Media Converters can be hot inserted and
removed from the chassis, thus removing the
need to power down the chassis for
maintenance and upgrades.