Specifications

Overview
16 Comdial October, ‘03
Figure 1-1 DX-80 Key Service Unit (KSU)
You can remove or reposition three panels installed over various KSU openings to accommodate
exterior connection requirements. You can remove one panel to route a serial cable through the KSU
outer housing for connection of ancillary SMDR equipment. You can remove another panel to route a
serial (NULL Modem) cable through the KSU outer housing for direct connection of a PC for on-site
PC-DBA programming. You can remove or reposition the remaining KSU panel to accommodate
cables entering through the outer housing for connecting station/extension cables or to the MDF.
From the exterior, with covers in place, the KSU1 and KSU2 look identical. However, KSU1 contains
the CPM (system call processing).
1.4 Power Supply
The power supply circuitry of the DX-80 incorporates a linear design AC transformer with a choice of
input voltage. The voltage selector switch is shipped set for 117vac applications; you can also set this
switch for 230vac applications. Since the power supply is linear in design, the output voltage varies
between 21.6vdc and 32vdc depending on load and stability of the input voltage. The output voltage is
delivered to the 408M (in KSU1, 408E in KSU2) for voltage regulation. All system operation and
logic voltages are produced at the 408M/E.