Comdial Dxp Plus Instructions Manual

							9.0 Understanding FCC Rules And Regulations
This DXP Plus digital communications system complies with Federal Communications Commission (FCC)
Rules, Part 68. The FCC registration label on the equipment cabinet contains the FCC registration number, the
ringer equivalence number, the model number, and the serial number or production date of the system.
Notification To Telephone Company
Unless a telephone operating company provides and installs the system, the telephone operating company which
provides the lines must be notified before a connection is made to them.  The lines (telephone numbers) involved,
the FCC registration number, and the ringer equivalence number must be provided to the telephone company.
The FCC registration number and the ringer equivalence number of this equipment are provided on the label
attached to the common equipment. The user/installer is required to notify the telephone company when final
disconnection of this equipment from the telephone company line occurs.
Compatibility With Telephone Network
When necessary, the telephone operating company provides information on the maximum number of telephones
or ringers that can be connected to one line, as well as any other applicable technical information. The telephone
operating company can temporarily discontinue service and make changes which could affect the operation of this
equipment. They must, however, provide adequate notice, in writing, of any future equipment changes that would
make the system incompatible.
Installation Requirements
Connection of the DXP Plus system to the telephone lines must be through a universal service order code (USOC)
outlet jack supplied by the telephone operating company.  If the installation site does not have the proper outlet,
ask the telephone company business office to install one. The correct outlet jack for this system is either a type
RJ21X or type RJ14C.
Party Lines And Coin Lines
Local telephone company regulations may not permit connections to party lines and coin lines by anyone except
the telephone operating company.
Troubleshooting
If a service problem occurs, first try to determine if the trouble is in the on-site system or in the telephone
company equipment.  Disconnect all equipment not owned by the telephone company. If this corrects the
problem, the faulty equipment must not be reconnected to the telephone line until the problem has been corrected.
Any trouble that causes improper operation of the telephone network may require the telephone company to
discontinue service to the trouble site after they notify the user of the reason.
Repair Authorization
FCC regulations do not permit repair of customer owned equipment by anyone except the manufacturer, their
authorized agent, or others who might be authorized by the FCC. However, routine repairs can be made
according to the maintenance instructions in this publication, provided that all FCC restrictions are obeyed.
IMI66–105 Installing The DXP Plus Main Cabinet
22 – Installing The DXP Plus Main Cabinet 
						

							Radio Frequency Interference
The DXP Plus system contains incidental radio frequency generating circuitry and, if not installed and used
properly, may cause interference to radio and television reception. This equipment has been tested and found to
comply with the limits for a Class A computing device pursuant to Subpart J of Part 15 of FCC Rules. These
limits are designed to provide reasonable protection against such interference when operated in a commercial
environment. Operation of this equipment in a residential area may cause interference to radio and television
reception; in which case the user is encouraged to take whatever measures may be required to correct the
interference.  If this equipment does cause interference to radio or television reception, which can be determined
by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the
following measures: Reorient the television or radio’s receiving antenna, and/or relocate the DXP, the individual
telephone stations, and the radio or TV with respect to each other. If necessary, the user should consult the
manufacturer or an experienced radio/television technician for additional suggestions.  The user may find the
following booklet prepared by the Federal Communications Commission helpful: “How to Identify and Resolve
Radio-TV Interference Problems.”  This booklet is available from the Government Printing Office, Washington
D.C. 20402. Stock No. 004-000-00345-4.
This equipment has been tested and found to comply with the limits of a Class A digital device, pursuant to Part
15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference
when the equipment is operated  in a commercial environment. This equipment generates, uses, and can radiate
radio  frequency energy and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause
harmful interference in which case the user will be required to correct the interference at his own expense.
This digital apparatus does not exceed the (Class A) limits for radio noise emissions from digital apparatus set out
in the Radio Interference Regulations of the Canadian Department of Communications.
Le pre’sent appareil nume’rique n’emet pes de bruits radioe’lectriques de’passant les limites applicables aux
appareils nume’riques (de la class A) prescrites dans le Re’glement sur le brouillage radioe’lectrique e’dicte’ par
le ministe’re des Communications du Canada.
CAUTION
Changes or modifications to this unit not expressly approved by the party responsible for compliance
could void the user’s authority to operate the equipment.
Ringer Equivalence Number
The REN of each line is 0.4B. The FCC requires the installer to determine the total REN for each line, and record
it at the equipment.
Installing The DXP Plus Main Cabinet IMI66–105
Installing The DXP Plus Main Cabinet – 23 
						

							Installing The DXP Plus
Expansion Common Equipment Cabinet
1.0 Installing The Expansion Common Equipment Cabinet
1.1 Considering The Mounting Parameters
Mount the first expansion cabinet above the main common equipment cabinet and mount the second expansion
cabinet below the main common equipment cabinet.
Insure that the expansion cabinet is within four feet of it own dedicated 117VAC, 15 AMP electrical outlet. (The
expansion cabinet requires its own dedicated 117VAC 15 AMP circuit, with a third-wire ground, supplied to a
standard NEMA 5-15R electrical outlet and supplied from the opposite phase of the AC power line that supplies
power to the main cabinet.)
CAUTION
This dedicated AC circuit must different from the dedicated AC circuit that you provide for the main
cabinet. For best results wire the expansion cabinet’s dedicated AC circuit from a power phase that is
opposite from the one that supplies the main cabinet’s AC circuit.
1.2 Inventorying The Tools And Hardware
·Round head wood screws (typically1/4x 1–inch)—for mounting expansion equipment cabinet to backboard)
·Cross recessed screwdriver (phillips-head type)—to match front panel shipping screws
·Flat blade screwdriver—to match front panel retaining screws
·Electric drill—if prepared holes are required
·Connecting tool—for fastening wires to a type-66 connector block.
·Crimping tool—for 623-type modular plugs
·Static discharge wrist strap and conductive floor mat
1.3 Complying With Underwriters Laboratories Regulations
Per The Underwriters Laboratories regulation 1459, 2nd edition, be aware of the following precautions when
installing telephone equipment that is to be directly connected to the telephone company network:
·Never install telephone wiring during a lightning storm.
·Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.
·Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the
network interface.
·Use caution when installing or modifying telephone lines.
This manual has been developed by Comdial Corporation (the “Company”) and is intended for the use of its customers and service personnel. The information in this manual is subject to change without notice.
While every effort has been made to eliminate errors, the Company disclaims liability for any difficulties arising from the interpretation of the information contained herein.
The information contained herein does not purport to cover all details or variations in equipment nor to provide for every possible contingency to be met in connection with installation, operation, or maintenance.
Should further information be desired, or should particular problems arise which are not covered sufficiently for the purchaser’s purposes, contact Comdial, Inside Sales Department, Charlottesville, Virginia
22906.
Printed in U.S.A.IMI66-106.02
6/95
R 
						

							1.4 Mounting The Expansion 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.
2. Expansion cabinet one mounts above the main cabinet and expansion cabinet two mounts below the main
cabinet. After you determine where you will mount the expansion cabinet, remove the plates covering the
appropriate interface cable access holes on the main and expansion cabinets. As you face the front of the
cabinets, these plates are located near the left front of the cabinet’s top and bottom.
3. The illustration shows the locating dimensions required for the expansion cabinet’s mounting screws. Mark
the hardware locations on the backboard either above or below the main common equipment cabinet
depending upon where you intend to mount the cabinet. (You must mount the cabinet vertically on the
backboard.)
4. Drill holes in the backboard of a proper size to accommodate the hardware being used.
5. Insert the two top screws into the backboard and tighten them to within approximately 1/8-inch of the surface.
6. Hang the cabinet on the top screws using the top mounting holes in the rear mounting flange of the cabinet.
Note that these holes are elongated with an enlargement at one end. This feature allows the cabinet to slide
down on the screws to secure the mounting when the cabinet is hung on them.
7. Use the openings for the middle and lower set of mounting screws as a guide, and mark the location for the
remaining screws.
8. Lift the cabinet from the top screws and set it aside while preparing the holes for the remaining screws.
9. Rehang the cabinet as discussed in step 6.
10. Insert the middle and lower screws into the backboard and tighten them to within approximately 1/8-inch of
the surface.
11. Shipping screws attach the front panel to the main cabinet. These screws are in addition to the two retaining
screws located at the lower corners of the panel. Remove and store the shipping screws. You will not need
them to re-attach the panel to the cabinet after you have installed the power supply assembly, circuit boards,
and wiring; however, you will need them to secure the panel in place if you should later transport the cabinet
to a new location.
12. After you remove the shipping and retaining screws, pivot the front panel upward until you can unhook the
panel hangers from the slots in the cabinet top. To re-attach the front panel, pivot it upward so that you can
hook the panel hangers into the slots at the top of the cabinet, and then pivot the panel down in place. Install
the two retaining screws at the bottom right-hand and left-hand corners of the panel to secure it to the cabinet.
IMI66–106 Installing The DXP Plus Expansion Cabinet
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							Mounting The Common Equipment Cabinet
22 5/16
Expansion
Cabinet 1
Panel
Retaining
Screws
Panel
Retaining
Screws
Panel
Retaining
Screws Typical Backboard
48 X 96 3/4 Plywood Sheet
Main
Cabinet
Expansion
Cabinet 2 12 3/4
10 1/2
10 1/2
10 1/2
10 1/2
10 1/2
10 1/24 3/4
4 3/4 48
PLUS024
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Installing The DXP Plus Expansion 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 should install and properly ground primary protection devices, such as gas discharge
tubes or similar devices, on all lines. While the line boards have internal secondary surge protection on all line
ports, in order for this protection to be effective, youMUSTconnect the common equipment cabinet to a reliable,
effective earth ground.
Proper DXP grounding is necessary for trouble-free operation and personnel safety. The DXPPlushas the
following three types of grounds:
·Service Ground—a neutral power line wire that is connected to the ground bus in the premises’ AC power
panel,
·System Ground—a non-current carrying power line wire that is connected to the ground bus in the premises’
AC power panel,
·Frame Ground—a low impedance conductor that places the common equipment cabinet at reference ground
potential. The frame ground provides the greatest safety by limiting electrical potential between non-current
carrying parts of the system. The common equipment cabinet provides a ground stud on its cabinet for access to
its frame ground.
Effective grounding requires that you connect the frame ground to a good earth ground. A good earth ground is
one such as the ground bus in the premises’ AC power panel or a public metallic cold water pipe at a point
immediately at its entrance to the premises and ahead of any meters, pumps, or insulating sections that have been
added for vibration reduction. Avoid using the premises’ structural steel frame as it may not be at earth ground
potential. Use #10–12 or larger insulated solid copper grounding wire to connect the frame ground of the
expansion cabinet (available through the ground stud on the expansion cabinet’s side) to the frame ground of the
main common equipment cabinet. Use #6 or larger insulated solid copper grounding wire to  make the ground
connection from the main cabinet’s frame ground to earth ground.Keep this ground wire separate from the
three-wire AC line cord, do not splice it, and keep it as short as possible.
The impedance of the wiring between the DXP and the earth ground must not exceed 0.25 ohms and the
impedance between the earth ground and the power company’s reference standard ground must not exceed 5
ohms. Use an acceptable low impedance measuring device to measure the impedance of these paths. The #6 or
larger wire size will minimize the wiring impedance; however, if the impedance between earth ground and the
power company’s standard reference ground exceeds 5 ohms, contact the local power company. The ground path
must always be of sufficient current-carrying capacity to prevent a build up of voltages that may result in circuit
noise, hazard to personnel, or equipment damage.
Be sure that all of the ground connections are visible for inspection and maintenance. Tag all of the ground
connections with a sign that reads:Do Not Remove Or Disconnect.
IMI66–106 Installing The DXP Plus Expansion Cabinet
4 – Installing The DXP Plus Expansion Cabinet 
						

							Grounding The Expansion Cabinets
Typical Earth
Ground No. 10 or 12 Solid Copper Wire
(Cabinet-to-Cabinet)
No. 10 or 12 Solid Copper Wire
(Cabinet-to-Cabinet) Grounding Terminal
Grounding TerminalTwo Grounding Terminals
No. 6 Solid Copper Wire
(Cabinet-to-Earth Ground)
PLUS039
Installing The DXP Plus Expansion Cabinet IMI66–106
Installing The DXP Plus Expansion 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 expansion cabinet per the following discussion and illustration.
1. Be sure to ground the common equipment cabinet per the instructions in the previous paragraph before
installing the power supply assembly.
2. Remove the power supply assembly from the carton. Be sure to save the small bag containing the mounting
hardware.
3. Slide the power supply assembly into the opening at the top right side of the common equipment main cabinet
until the assembly’s front panel contacts the side of the cabinet.
4. Locate the power cable routed from the backplane and connect it to the power suppy connector.
5. Remove the #6 thread-forming screws from the hardware bag and secure the power supply assembly to the
expansion cabinet.
6. The supplied power supply accessories include a ferrite collar. Snap this collar around the AC power cord to
provide protection against radio frequency interference.
IMI66–106 Installing The DXP Plus Expansion Cabinet
6 – Installing The DXP Plus Expansion Cabinet 
						

							PLUS075
Typical Common Equipment Cabinet
Power
Supply
Assembly
Machine Screw
(4 Places)
Installing The Power Supply Assembly
Installing The DXP Plus Expansion Cabinet IMI66–106
Installing The DXP Plus Expansion Cabinet – 7 
						

							2.1 Making The AC Power Connection
·For the expansion cabinet’s AC power connection, employ a dedicated 117VAC 15 AMP circuit, with a
third-wire ground, supplied to a standard electrical outlet (NEMA 5-15R) for the AC power connection.
Remember, this electrical outlet must be located within four feet of the common equipment expansion cabinet.
Remember also, this dedicated electrical outlet is in addition to the one that you provide for the main cabinet’s
AC power needs.
CAUTION
This dedicated AC circuit must different from the dedicated AC circuit that you provide for the main
cabinet. For best results wire the expansion cabinet’s dedicated AC circuit from a power phase that is
opposite from the one that supplies the main cabinet’s AC circuit.  Connecting too much  electrical
equipment to one power phase may overload that power phase and cause a drop in the supplied AC
voltage.
·Install a plug-in power line surge protector between the equipment’s AC power cord and the AC outlet to
provide protection against surges and spikes that may appear on the AC line.
CAUTION
DO NOT attach or secure the line cord to the surface of the mounting location in any manner.
IMI66–106 Installing The DXP Plus Expansion Cabinet
8 – Installing The DXP Plus Expansion Cabinet