Comdial Dxp Plus Instructions Manual

1.4 Mounting The Common Equipment Cabinet
1. Unpack and carefully inspect all equipment for shipping damage.  Notify the shipper immediately of any
damages found. Verify that the packages contain all parts and accessories needed for proper installation and
operation.
NOTE: The following instructions describe how to mount the main cabinet using a backboard; however, you can
mount the cabinet on a standard 23–inch equipment rack if you wish.
2. Choose a place at the mounting location where the backboard...

48
12 3/4
10 1/2
10 1/222 5/16
Retaining
Screws
(Two Places) Typical Backboard
48 X 96 X 3/4 Plywood Sheet
PLUS025
Mounting The Common Equipment Cabinet
Installing The DXP Plus Main Cabinet IMI66–105
Installing The DXP Plus Main Cabinet – 3 

1.5 Understanding System Grounding Requirements
Transient voltage spikes, if induced onto CO or CENTREX lines, can travel through the cable and into the
common equipment. The telephone company offers basic protection against this condition but it is usually
designed to protect the central office circuits. While it will also provide some protection to the common
equipment, you should not rely upon it for total protection. To help ensure that external over-voltage surges do not
damage the system, you...

No. 6 Solid
Copper Wire Grounding
Terminal
Typical Earth
Ground
PLUS040
Grounding The System
Installing The DXP Plus Main Cabinet IMI66–105
Installing The DXP Plus Main Cabinet – 5 

2.0 Installing The Power Supply
NOTE: The common equipment cabinet employs an electronic switching power supply. During operation, power
supplies of this type generate an audible sound from their switching regulators.  This sound is normal and
is not an indication that the power supply is operating improperly.
Install the power supply assembly in the common equipment cabinet per the following discussion and illustration.
1. Be sure to ground the common equipment cabinet per the instructions in the...

2.1 Making The AC Power Connection
·For the main cabinet’s AC power connection, employ a dedicated 117 VAC 15 AMP circuit, with a third-wire
ground, supplied to a standard electrical outlet (NEMA 5-15R). Remember, this electrical outlet must be
located within four feet of the common equipment cabinet. Remember also, you must supply two dedicated
electrical outlets if you plan to later install expansion cabinets.
NOTE: If you install the optional battery back-up assembly, you can use this same outlet to...

2.2 Measuring The Power Supply Voltages
If you need to measure power supply voltages, you can do so at the DC voltage connector. Measure the power
under the following conditions:
·AC line cord connected to the AC outlet,
·DC power cable disconnected from power supply’s DC voltage connector,
·AC power switch turned on.
Measurement details are shown in the illustration.
CAUTION
Once you have measured the power supply voltages, turn off the AC power switch and disconnect the AC
line cord from the AC outlet....

Measuring The Power Supply Voltages
Power Supply Measurements
Measure Between Terminals
Measured Values
+ Voltmeter
Lead- Voltmeter
Lead
Pin 1 Pin 3 - 36 VDC +/- 1.0V
Pin 5 Pin 7 + 5 VDC +/- .3 V
Pin 6 Pin 7 - 5 VDC +/- .3 V
Pin 8 Pin 70 volts = normal operation
+ 5 V nominal = thermal overload condition
(press Reset switch)
On = -36 VDC
On = +5 VDC
On = -5 VDC
On = Thermal Overload
On = Battery Backup Connected
Pins 1 & 2 = -36 V Ground
Pins 3 & 4 = -36 VDC
Pin 5 = +5 VDC
Pin 6 = -5 VDC
Pin 7 = Digital...

3.0 Installing Circuit Boards In The Main Cabinet
CAUTION
Circuit boards for the DXP Plus system are susceptible to damage caused by electrostatic discharge, and
you must keep this fact in mind as you handle the circuit boards. Refer to the Comdial publication
IMI01-005,Handling Of Electrostatically Sensitive Components, for general information. Specific
handling precautions are also included in this installation instruction.
Each circuit board is supplied in a static protection bag. Do not open a static...

Typical Earth
Ground
Static
Wrist
Strap
ESD Protective
Mat ESD Protective
Mat
ESD Protective
Worksurface
Static 2
Common Point Ground
Creating A Static Safe Work Area
Backboard
Earth
Ground 1 Meg Ohm
Resister Conductive
MatStatic Discharge
Wrist Stap Common
Equipment
Cabinet
PLUS034
Providing Static Protection At The Cabinet Mounting Location
Installing The DXP Plus Main Cabinet IMI66–105
Installing The DXP Plus Main Cabinet – 11