Comdial Dxp Plus Instructions Manual

							3.3 Understanding The DXP Plus Logical Numbering
Because there are no dedicated station or line ports in the DXP Plus, the system uses an automatic configuration method
to logically number its stations and lines. Automatic configuration occurs after you perform a master clear on the
system.
How automatic configuration works
With automatic configuration, the system does a search for all installed station and line boards in the main and
expansion cabinets, and assigns a logical number for each provided station and line encountered during the search. The
search begins in the main cabinet at the left-most universal slot and proceeds left to right. The search then moves to the
upper expansion cabinet where it searches left-most slot to right-most slot. The search finally moves to the lower
expansion cabinet where it again searches left-most slot to right-most slot. When automatic configuration is finished,
the system has logically numbered all station and line ports in ascending order from the left-most slot to right-most slot
throughout the entire system.
How logical number and physical location relate to one another
The logical number of a station or line corresponds to its relationship to other stations or lines in the system but is not
dependent upon the board’s placement in the cabinet. The physical location of a station or line corresponds to the order
of the system’s board slots. The main cabinet contains slots 1–9, the upper expansion cabinet contains slots 10–20, and
the lower expansion cabinet contains slots 21–30.  Therefore, even if the first encountered station board is located in
slot five of the main cabinet, the system still assigns logical number one to the first station provided by that board.
During installation, you can skip slots. For example, you can install eight-line, loop start, line boards in only slots one
and 30 if you wish. In this case, slot one yields logical line numbers 1–8 and slot 30 yields logical line numbers 9–17.
Where you can place circuit boards
Each installed board requires timing circuits equal to its capacity. For example, a 16–station board requires 16 timing
circuits, an eight–line loop start line board requires eight circuits, and a fully configured T1 trunk board requires 24
timing circuits. In the DXP Plus, each universal slot provides 32 timing circuits. Because of this timing circuit provision
of each slot, you can place any station or line board at any slot location with no restrictions.
Adding boards without renumbering
If you install or relocate a station or line board, this board does not operate until you take appropriate programming
action. If you use an available open slot for adding or relocating a board, that board’s stations or lines assume logical
numbers in sequence after the system’s last assigned logical station or line number. For example, if the system’s last
logical station number is 24, the logical numbers of the newly installed board’s stations begin at logical number 25.
After you remove a board and delete it through programming, that board’s logical numbers are available for
reassignment. This means that you can remove a board, add or move another board, take the appropriate programming
action, and have the stations or lines of the added or relocated board assume the logical numbers made available by the
removed board. For example, if the system’s last logical number is 64 and you remove the board providing stations with
logical numbers 1–16 and delete it through programming, the stations on an added board assume logical numbers
beginning with 1 instead of 65. However, if you remove and program delete an eight-station board and add a 16-station
board, the first eight stations stations on the added board assume logical numbers 1–8 and the last eight stations assume
logical numbers 65–72.
Remember, should you master clear the system, the automatic configuration feature logically numbers all station and
line ports in ascending order from the left-most slot to right-most slot throughout the entire system. This action
renumbers those station and lines provided by boards that you have added or relocated since you last performed the
system master clear.
3.3.1 Understanding Station Pairing
Station ports are paired ODD/EVEN, beginning with the lowest directory number 101/102, 103/104, etc., for data
and for overload protection. The odd port is the positive voltage (+) port and the even port is the negative voltage
(-) port.
Installing The Digital Station Board IMI89–174
Installing The Digital Station Board – 9 
						

							3.4 Detailing Station Call Announce Parameters
The DXPPlussystems place no limits (other that the distance constraints stated previously) on telephone
placement and arrangement within the system; however, when placing telephones that require call announcing
capability, consider the parameters detailed in the call announce matrix table.
Call Announce Matrix
Receive Call Announcements
Digital
SpeakerDigital
MonitorDigital
Single
LineAnalog
SpeakerAnalog
MonitorAnalog
Single
LinePC
Atten.Scout
900MXIndustry
Standard
Digital
SpeakerYES YES NO YES NO NO NO NO NO
Digital
MonitorYES YES NO YES NO NO NO NO NO
Digital
Single
LineYES YES NO YES NO NO NO NO NO
Analog
SpeakerYES YES NO YES YES NO NO NO NO
Analog
MonitorYES YES NO YES YES NO NO NO NO
Analog
Single
LineYES YES NO YES NO NO NO NO NO
PC
Atten.YES YES NO YES NO NO NO NO NO
Scout
900MXYES YES NO YES NO NO NO NO NO
Industry
StandardYES YES NO YES NO NO NO NO NO
Originate Call Announcements
IMI89–174 Installing The Digital Station Board
10 – Installing The Digital Station Board 
						

							4.0 Testing The Digital Station Installation
4.1 Making A Resistance Check
Measure the resistance at the station connector blocks under the following conditions.
·AC power cord disconnected from electrical outlet.
·Common equipment connected to station connector blocks.
·Stations wired and wiring punched down on blocks.
·Bridging clips removed from blocks to isolate stations from common equipment.
Measure the resistance of each installed station and wiring from the station side of the connector blocks.
Resistance values will vary with cable length and station type but should be within the following limits:
4 Greater than 700 Kohms
Measure the resistance of the common equipment and cables from the common equipment side of the station
connector blocks. The resistance value should be within the following limits.
4 40–50 Ohms
4.2 Making A Voltage Check
Make the following voltage measurements at the station connector blocks under the following conditions:
·Bridging clips installed
·AC power connected to the common equipment
Measure the voltage across the signal pair. The measured voltage must be within the following limits:
4 28–36 VDC
4.3 Causing A Digital Station To Self Test
The multiline stations can be self tested for proper operation per the following instructions:
1. Disconnect line cord at station base.
2. Press and hold MUTE and reconnect line cord to station connector. Station will automatically perform self
test routine.
3. Release MUTE as soon as test begins. Sequence of test is as follows:
·(a.) Indicators will light in sequence
·(b.) Ringer will sound - be sure volume is set to low or high
·(c.) Indicators and ringer will then turn off at the same time
4. Replace any station that does not pass the self test.
Installing The Digital Station Board IMI89–174
Installing The Digital Station Board – 11 
						

							Installing An Industry-Standard Telephone Station Board
In The DXP Plus Digital Communications System
1.0 Understanding Industry-Standard Telephone Support
The DXPPlusdigital communications system supports the use of on-premise industry-standard telephones (IST)
through IST station interface boards. IST installations require a ring generator assembly—one required for the
main common equipment cabinet and another one in each expansion common equipment cabinet. Plus, IST
installations may require a dual tone multiple frequency (DTMF) receiver card if additional DTMF receivers are
required beyond the one provided by the services board.
1.1 Detailing The Necessary Equipment
Regardless of the number of industry-standard telephones that you plan to install, you will need to install the
following equipment:
·at least one IST station interface board,
·one ring generator assembly for each equipment cabinet that will contain IST station interface boards,
·at least one line interface circuit board
The DXPPlusservices board provides on-board DTMF receiver circuitry capable of supporting simultaneous
dialing of one industry-standard telephone at a time. This provision is adequate if your site requires only a few
industry-standard telephones; however, if you intend to support a population of industry-standard telephones that
will generate a large volume of outgoing call traffic, you may need to install one or more DTMF receiver cards to
provide additional DTMF receivers for the telephones. Each receiver card allows four ISTs to dial simultaneously.
The number of cards that you need to install in the system depends upon how active the ISTs will be at the site.
See section 1.2 for complete details.
If you do need to add receiver cards, you have three choices as to where to install them.
1. The best and recommended choice is to add one receiver card to top position on the main cabinet’s services
board.
NOTE: You can add two additional receiver cards to the lower two positions on the services board; however, you
must take specific programming action to enable their use (the name of this program option is: Services
DTMF Highway). If you add these two cards and take this program option, you can add only one card to
the interface board in the lower expansion cabinet (discussed in step 2 below).
2. The second best choice is to add up to three receiver cards to each expansion cabinet interface board if one or
both is available. Remember, add only one card to the lower cabinet’s interface board if you have added or
will add two additional receiver cards to the lower two positions on the services board and take programming
action to enable their use
3. The third choice is to add an auxiliary board to the system and install up to four DTMF receiver cards on it.
This is the least desirable choice because it requires you to occupy a board slot that you could otherwise use
for line or station boards.
R
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 or 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.IMI89-184.01
7/95 
						

							1.2 Determining The Board Configuration That You Will Need
Use the following specifications to determine the maximum number of station boards and DTMF receiver cards
that you may need.
·Each eight-station circuit board supports up to eight telephones. (It will actually support 16 telephones—two
telephones at each port sharing a common intercom number.)
·You can bridge up to two industry-standard telephones at one station port as long as you do not exceed a
combined ringer equivalence number, or REN, of 2.0. (Remember, with two telephones at the same port,
they share a common intercom number.)
·Each 16-station circuit board supports up to 16 telephones. (It will actually support 32 telephones—two
telephones at each port sharing a common intercom number)
·You can bridge up to two industry-standard telephones at one station port as long as you do not exceed a
combined ringer equivalence number, or REN, of 2.0. (Remember, with two telephones at the same port,
they share a common intercom number.)
·Each receiver card allows four industry-standard telephones to dial simultaneously. (The number of cards that
you need to install in the system will depend upon how active the industry-standard telephones will be at the
site.)
·You can install one receiver card in the top position on the services board. The services board always
provides on-board DTMF receiver circuitry capable of supporting simultaneous dialing of one
industry-standard telephone. With the addition of a receiver card, the services board supports simultaneous
dialing of five industry-standard telephones. You can add two additional receiver cards to the lower two
positions on the services board; however, you must take specific programming action to enable their use
(this program feature name is:Services DTMF Highway). With these additional two cards, the services
board supports simultaneous dialing of 13 industry-standard telephones.
·You can install three receiver cards on the expansion cabinet interface boards. With three receiver cards
installed, each expansion cabinet’s interface board supports simultaneous dialing of 12 industry-standard
telephones.
CAUTION
If you add two additional receiver cards to the lower two positions on the services board, you can add
only one receiver card to the lower expansion cabinet’s interface board..
·You can install four receiver cards on a auxiliary board. With four receiver cards installed, an auxiliary
board supports simultaneous dialing of 16 industry-standard telephones (Remember, while you can install
up to five auxiliary boards in the system, each auxiliary board that you use occupies a slot where you could
install a station or line board.)
Based upon the above specifications, a fully-equipped DXPPlussystem with a minimum of one line board and no
auxiliary boards will provide the following industry-standard telephone support:
·main cabinet (reserving one slot for a line board) supports128 telephones(eight 16-station boards times 16
station ports per board—256 telephones with two telephones per station port sharing the same extension
number),
·upper expansion cabinet supports176 telephones(eleven 16-station boards times 16 station ports per
board—352 telephones with two telephones per station port sharing the same extension number),
·lower expansion cabinet supports160 telephones(ten 16-station boards times 16 station ports per board—320
telephones with two telephones per station port sharing the same extension number).
These individual totals add together to provide a system support total of464 telephones(The total is 928
telephones with two telephones per station port sharing the same intercom number.)
IMI89–184 Installing The IST Station Board
2 – Installing The IST Station Board 
						

							You can configure the system so that a maximum of 29 of these telephones can dial simultaneously.
·services board circuitry that supports one telephone plus one receiver card that supports four telephones
provides support for five simultaneously dialing telephones
·upper expansion cabinet interface board with three receiver cards supports 12 simultaneously dialing telephones
·lower expansion cabinet interface board with three receiver cards supports 12 simultaneously dialing telephones
If you add the maximum of five auxiliary boards and install four receiver cards on each board, you can increase
the simultaneous dialing capacity to 109 telephones but you reduce the maximum telephone capacity to 384. (The
total is 788 telephones with two telephones per station port sharing the same extension number.)
1.2.1 Calculating Your Receiver Card Needs
You can use the following formula to determine how many receiver cards that you must install in your system.
(Simultaneous Dialing Telephones) - (1 Telephone Supported By Services Board)
( 4 Telephones Per Card)= Receiver Cards
As an example, the system maximum is as follows: (110 - 1)¸4 = 27 cards
If you are not sure how many telephones will dial at the same time in your system, you can use the following
typical system averages and formula to arrive at an usable estimate.
A typical telephone system, experiences the following call traffic percentages. Your system may be similar.
·Light Call Traffic = up to 15 percent of the telephones dial simultaneously
·Moderate Call Traffic = up to 20 percent of the telephones dial simultaneously
·Heavy Call Traffic = up to 30 percent of the telephones dial simultaneously
(Percent Of Simultaneous Dialing) x (Installed IST Telephones) = (Simultaneous Dialing Telephones)
An an example the system maximum is as follows: .286 x 384 = 110 telephones
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.
Installing The IST Station Board IMI89–184
Installing The IST Station Board – 3 
						

							2.0 Installing Circuit Boards
CAUTION
Circuit boards 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.
2.1 Creating A Static Safe Work Area
When servicing the common equipment cabinet at the installation location, it is a good practice to place a
conductive mat in front of the cabinet area and ground the mat to a good earth ground. (The third wire ground of
the AC power line is also an acceptable grounding point.) The grounded conductive mat provides a safe static
electric discharge path.
When removing the common equipment cabinet from the installation location for servicing, it is a good practice to
prepare a static-safe work area on which to place the cabinet.
You should supply yourself with a static discharge wrist strap, and wear it every time you handle electronic circuit
boards either at the cabinet mounting location or at your work area.
IMI89–184 Installing The IST Station Board
4 – Installing The IST Station Board 
						

							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
Expansion
Cabinet
Expansion
Cabinet
Earth
Ground 1 Meg Ohm
Resister Conductive
MatStatic Discharge
Wrist Stap Common
Equipment
Cabinet
PLUS035
Providing Static Protection At The Cabinet Mounting Location
Installing The IST Station Board IMI89–184
Installing The IST Station Board – 5 
						

							2.2 Installing IST Station Boards In The Equipment Cabinet
1. Normally you should first disconnect the optional battery back-up equipment from the power supply and then
disconnect the AC power cord from the AC outlet; however, when necessary, you can install a station board
in an operating system. If you must do this, connect one end of a standard telephone handset coil cord to the
precharge port on the power supply. During step 5, you will connect the other end of this coil cord to the
precharge jack on the station board.
2. Install your static discharge wrist strap on your bare wrist; adjust it for a snug fit.  Be sure that the strap is
touching bare skin and is not isolated by clothing. Connect the wrist strap cord between the wrist strap and an
AC or earth ground
NOTE: With the common equipment in the installed position, the ground lug on the side of the cabinet is an
appropriate grounding point since it should have a heavy ground wire connected between it and a good
earth ground.
3. Loosen the retaining hardware and lift the front panel away from the common equipment cabinet.
4. Each station board is supplied in a static protection bag for safe keeping. When you are ready to install the
circuit board, remove it from its static protection bag.
5. Locate the proper board slot. On DXPPlussystems, the station boards connect to any universal slot; however,
do not install a station board at the right-most board slot in the second (or lower) expansion cabinet. The
system reserves the software timing associated with this slot for internal use.
6. If you are installing the station board in an operating system, connect the free end of the precharge cord that
you installed in step 1 to the precharge jack on the station board.
7. Orient the station board with its top and bottom guides in main cabinet board cage. and press the board firmly
until its board edge connection properly mates with the connector on cabinet’s backplane. If you connected a
handset cord between the pre-charge port on the power supply and the jack on the circuit board, disconnect
the cord after installing the board.
CAUTION
When pressing circuit boards into place, press them only at the extractor lever locations.
If you apply pressure at other locations you may damage the board assembly.
8. Repeat steps 3 and 4 until all circuit boards are installed.
9. Make a final inspection to ensure that all circuit boards are, oriented correctly and mated properly.
10. Install and tighten the supplied screws to secure the circuit boards to the board cage.
11. Each station board includes a ferrite collar. Snap the ferrite collar around the cable station to provide
protection against radio frequency interference.
12. If your installation requires additional DTMF receivers, add receiver cards by following the instructions
included with the card.
13. If the cabinet where you installed the IST station boards does not now include a ring generator assembly,
install a ring generator assembly by following the instructions included with the assembly.
14. Plug the AC line cord into the AC outlet, reconnect any battery back up equipment, and turn on the switch on
the power supply.
15. Replace the front panel on the common equipment cabinet.
IMI89–184 Installing The IST Station Board
6 – Installing The IST Station Board 
						

							Viewing A Typical Station Board Installation
Static Discharge Wrist StrapPower Supply
Pre-charge Port
Typical Industry
Standard Station
Board Station Board
Pre-charge
Port Pre-charge
Cable For
Station Board
Installation
During
Power Up
PLUS026
Installing The IST Station Board IMI89–184
Installing The IST Station Board – 7