Bay Technical Associates BayStack Fiber Media Adapter - Manual (Page 9)

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For a pair of ports to operate in redundant mode:
• Enable the JP1 jumper for redundant port mode on both of
the media adapters in the redundant port pair. For more
information about this jumper, see “Redundant Enable
Jumper” earlier in this guide.
• Disable any redundant port mode on the port at the other end
of each redundant link.
A Rdn LED media adapter indicates redundant link status. For
more information about this LED, see “LEDs” earlier in this
guide.