Vertical comdial DX-120, Installation And Maintenance Manual

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I
NSTALLING THE
DX-120
DX-120 Installation and Maintenance Manual
- 68 -
Adding a DPM16 (Digital Port Module – 16 port)
•
Two DPM16 (Digital Port Module, 16-port - i.e., 16 digital phones) modules can be added to each KSU of the
DX-120 system.
•
These modules expand the DX-120 system extension capacity to a maximum of 40 digital ports in each KSU
(80 total digital ports).
•
DPM16’s are installed by connection to the 408M via the Extension Expansion module connectors (“J2”and
“J3.”)
•
The DPM16 board has eight RJ-12 jacks.
•
Each RJ-12 jack has four wires so you plug two phones into each jack.
•
You cannot do a Off-Hook Voice Announce (OHVA) to a phone that is plugged into the DPM16. However, you
can do a OHVA from a phone that is plugged into a DPM16 board.
INSTALLING A DPM16
1) Be sure that the entire system is turned off.
2) Remove the KSU cover (four screws at each corner).
3) Install a static discharge wrist strap on your bare wrist, and adjust it for a snug fit.
CAUTION
Be sure that the strap is touching bare skin and is not isolated by clothing.
4) Connect the wrist strap cord between the wrist strap and an AC or earth ground.
5) Connect a static discharge wrist strap to a suitable earth ground.
CAUTION
Circuit boards are susceptible to damage caused by electrostatic
discharge. You must keep this in mind as you handle the circuit boards.
For additional information, see Vertical publication IMI01-005, Handling of
Electrostatically Sensitive Components.
6) Remove the DPM16 module from the packaging and locate the four brass-color standoffs packaged
with the module.
7) Position the DPM16 over the left-hand side of the 408M/E and any other extension modules already
installed.
NOTE
When installing DPM16 modules, Vertical recommends that you install them
closest to the 408M/E. That is, if an APM4 module is installed move it outward
(toward cabinet cover) and install the add-on DPM16 first, then re-install the
APM4. In the KSU extension modules are always installed on the left-hand side.
8) Use the four brass-color standoffs supplied with the DPM16 to secure the DPM8 in position.
9) Connect the DPM16 ribbon cable to the 408M Extension Expansion Module Connector closest to the
DPM16.
HINT
Press firmly (but not forcefully) on the connector to secure a good connection.
Installing a DPM16 (continued on next page)