7aaa manual - copy
Comdial Digital (DSU & DSU II)
 
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Comdial DSU "G" Series
Comdial DSU "C" Series
Comdial DSU II "J" Series
Comdial Digital Misc

Installation, Programming, Service, Owners & Users Manuals. 

DSU is a black case and DSUII is a grey case.
 
G1632 is a DSU black cabinet
J1632 is a DSUII gray cabinet