Vertical Edge 120 Specifications download pdf (Page 21)

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DX-120 Installation and Maintenance Manual OVERVIEW

Key Service Unit

The DX-120 Key Service Unit (KSU) is a modular flat-pack design. Two KSU’s (KSU1 and KSU2) may be

equipped to achieve the total system capacity of 16 loop start, 24 digital lines, 88 extensions (80 digital and 8

analog) and 8 voice processing channels. KSU1 is factory equipped with one 408M, one APM4 and the CPM.

KSU2 is factory equipped with one 408E.

Each KSU is a self-contained cabinet with internal power supply. The power supply AC transformer voltage switch

can be set for either 117vac or 230vac operation. (It is factory set for 117vac operation.) The KSU is designed to

be mounted on the wall and is shipped with a wall mounting template. The compact KSU weighs less than 20

pounds and is UL Listed.

DX-120 Key Service Unit (KSU)

You can remove:

• Or reposition four panels installed over various KSU openings to accommodate

exterior connection requirements.

• One panel to route a serial cable through the KSU outer housing for connection of

ancillary SMDR equipment.

• 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.

• Or reposition the remaining KSU panel to accommodate cables entering through the

outer housing for connecting station/extension cables or to the MDF.

• The panel covering the jacks on the phone boards (located under the left side of the

main board).

NOTE

From the exterior, with covers in place, the KSU1 and KSU2 look identical.

However, KSU1 contains the CPM (system call processing).

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Vertical Edge 120 Specifications Page 21