DLU (DUPLEX
LINK
UNIT)
Function: This
unit
operates
under HCU control
to connect or disconnect the in-
dividual links for hands free con-
versation between two stations.
One DLU is provided with 4 links.
Up to 3 DLUs can be installed with
the EX-510, and up to 4 DLUs with
the EX-520.
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