Comdial Dxp Plus Instructions Manual

							3.0 Connecting The Stations
Connections between the telephone stations and the common equipment station boards are typically via type
66M-xx connector blocks that are cable connected to 50-pin male connectors on the station boards.
The maximum distance allowed from the common equipment to the industry-standard telephone varies with the
gauge of wire that you use to make the connection. Refer to the following chart for complete details.
Station Type Wire Gauge
20 AWG 22 AWG 24 AWG
Industry-Standard
Telephones4000 Feet 3500 Feet 3000 Feet
The maximum distances stated above are dependent upon the following conditions:
·resistance of industry-standard telephone (per EIA specs) cannot exceed 300 ohms maximum,
·DC load resistance of the wiring between the common equipment and the industry-standard telephone Plus the
DC resistance of telephone itself can not exceed 460 ohms maximum.
If spare conductors exist in the cables that you run between the station boards and the 66M-xx connector blocks, it
is a good practice to connect the spare conductors to earth ground. Doing this may help prevent the spare
connectors from inducing radio frequency and/or AC interference into the system.
Remember, you should snap a ferrite collar around each station cable to provide protection against radio
frequency interference.
CAUTION
The polarity between the individual wires in a particular voice pair is not critical.
IMI89–184 Installing The IST Station Board
8 – Installing The IST Station Board 
						

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CLIP TERMINALS
50
26
1 25
Typical Station
Connector Block
Ferrite
Collar Female 50-pin
Cable Connector
J1 (Male 50-pin
Connector) Typical Industry-Stand
a
Station Board
J2 (Male 50-pin
Connector)
PLUS027
Connecting Telephones To The IST Station Board
Installing The IST Station Board IMI89–184
Installing The IST Station Board – 9 
						

							3.2 Detailing The Station Connections For J1
25-Pair Connections Two-Wire Connections Station Connections
Wire Color Pair Pin
No.Clip
Term.Pair Wire Color Station Location
White-Blue 1 26 1 Tip Lead Green1Blue-White 1 2 Ring Lead Red
White-Orange 2 27 3
No connectionOrange-White 2 4
White-Green 3 28 5
Green-White 3 6
White-Brown 4 29 7 Tip Lead Green
2Brown-White 4 8 Ring Lead Red
White-Slate 5 30 9
No connectionSlate-White 5 10
Red-Blue 6 31 11
Blue-Red 6 12
Red-Orange 7 32 13 Tip Lead Green
3Orange-Red 7 14 Ring Lead Red
Red-Green 8 33 15
No connectionGreen-Red 8 16
Red-Brown 9 34 17
Brown-Red 9 18
Red-Slate 10 35 19 Tip Lead Green
4Slate-Red 10 20 Ring Lead Red
Black-Blue 11 36 21
No connectionBlue-Black 11 22
Black-Orange 12 37 23
Orange-Black 12 24
Black-Green 13 38 25 Tip Lead Green
5Green-Black 13 26 Ring Lead Red
Black-Brown 14 39 27
No connectionBrown-Black 14 28
Black-Slate 15 40 29
Slate-Black 15 30
Yellow-Blue 16 41 31 Tip Lead Green
6Blue-Yellow 16 32 Ring Lead Red
Yellow-Orange 17 42 33
No connectionOrange-Yellow 17 34
Yellow-Green 18 43 35
Green-Yellow 18 36
Yellow-Brown 19 44 37 Tip Lead Green
7Brown-Yellow 19 38 Ring Lead Red
Yellow-Slate 20 45 39
No connectionSlate-Yellow 20 40
Violet-Blue 21 46 41
Blue-Violet 21 42
Violet-Orange 22 47 43 Tip Lead Green
8Orange-Violet 22 44 Ring Lead Red
Violet-Green 23 48 45
No connection
Green-Violet 23 46
Violet-Brown 24 49 47
Brown-Violet 24 48
Violet-Slate 25 50 49
Slate-Violet 25 50
IMI89–184 Installing The IST Station Board
10 – Installing The IST Station Board 
						

							3.3 Detailing The Station Connections For J2
25-Pair Connections Two-Wire Connections Station Connections
Wire Color Pair Pin
No.Clip
Term.Pair Wire Color Station Location
White-Blue 1 26 1 Tip Lead Green9Blue-White 1 2 Ring Lead Red
White-Orange 2 27 3
No connectionOrange-White 2 4
White-Green 3 28 5
Green-White 3 6
White-Brown 4 29 7 Tip Lead Green
10Brown-White 4 8 Ring Lead Red
White-Slate 5 30 9
No connectionSlate-White 5 10
Red-Blue 6 31 11
Blue-Red 6 12
Red-Orange 7 32 13 Tip Lead Green
11Orange-Red 7 14 Ring Lead Red
Red-Green 8 33 15
No connectionGreen-Red 8 16
Red-Brown 9 34 17
Brown-Red 9 18
Red-Slate 10 35 19 Tip Lead Green
12Slate-Red 10 20 Ring Lead Red
Black-Blue 11 36 21
No connectionBlue-Black 11 22
Black-Orange 12 37 23
Orange-Black 12 24
Black-Green 13 38 25 Tip Lead Green
13Green-Black 13 26 Ring Lead Red
Black-Brown 14 39 27
No connectionBrown-Black 14 28
Black-Slate 15 40 29
Slate-Black 15 30
Yellow-Blue 16 41 31 Tip Lead Green
14Blue-Yellow 16 32 Ring Lead Red
Yellow-Orange 17 42 33
No connectionOrange-Yellow 17 34
Yellow-Green 18 43 35
Green-Yellow 18 36
Yellow-Brown 19 44 37 Tip Lead Green
15Brown-Yellow 19 38 Ring Lead Red
Yellow-Slate 20 45 39
No connectionSlate-Yellow 20 40
Violet-Blue 21 46 41
Blue-Violet 21 42
Violet-Orange 22 47 43 Tip Lead Green
16Orange-Violet 22 44 Ring Lead Red
Violet-Green 23 48 45
No connection
Green-Violet 23 46
Violet-Brown 24 49 47
Brown-Violet 24 48
Violet-Slate 25 50 49
Slate-Violet 25 50
Installing The IST Station Board IMI89–184
Installing The IST Station Board – 11 
						

							3.4 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 DXPPlus,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.
IMI89–184 Installing The IST Station Board
12 – Installing The IST Station Board 
						

							4.0 Checking Out The Installation And Isolating Failures
Check the telephone installation for proper operation by performing the following voltage measurements.
4.1 Voltage Check
Make the following voltage measurements at the station connector blocks under the following conditions:
·Common equipment connected to station connector blocks.
·Stations wired and wiring punched down on blocks.
·Bridging clips installed
·AC power connected to the common equipment
Measure the DC voltage across the Tip and Ring leads for each installed telephone with a DC voltmeter. Then,
call the industry-standard telephone to stimulate the ring generator assembly and measure the AC ringing voltage
across the Tip and Ring leads for each installed telephone with an AC voltmeter.
The measured voltages must be within the limits shown in the chart below. If your measured readings are
different from these charted values, it could indicate a possible wiring error or a station or common equipment
problem.
66M-xx Connector Meter Lead Polarity Measured DC Volts Measured AC Ring
Voltage
Tip Lead +
+36±3 VDC 70±5 VAC
Ring Lead -
Installing The IST Station Board IMI89–184
Installing The IST Station Board – 13 
						

							Installing The Loop Start Line Board
In The DXP Plus Digital Communications System
1.0 Introducing The Loop Start Line Board
1.1 Defining Loop Start
The line board signals for the host system to complete a line connection by sending a supervisory signal to the
host system. Typically this signal is the hookflash that occurs when a user takes a telephone off hook on the line.
The line board transmits this signal to the host system by placing a resistance across the line’s tip and ring leads to
complete a current loop. When the host system senses this resistance, it sends dial tone over the line thus giving
line service to the system.
1.2 Inventorying The Loop Start Line Boards
There are two versions of the loop start line board. One version interfaces four central office lines and the other
version interfaces eight central office lines.
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 un-insulated telephone wires or terminals unless the telephone line has been disconnected at the
network interface.
·Use caution when installing or modifying telephone lines.
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 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.IMI89-172.01
7/95 
						

							2.0 Installing Circuit Boards In The Equipment Cabinet
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.
IMI89–172 Installing The Loop Start Line Board
2 – Installing The Loop Start Line 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 Loop Start Line Board IMI89–172
Installing The Loop Start Line Board – 3 
						

							2.2 Installing Loop Start Line Boards
1. Normally you should disconnect the AC power cord from the AC outlet and disconnect the optional battery
back-up assembly from the main cabinet power supply; however, when necessary, you can install a line 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 line 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. Each circuit 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.
4. Locate the proper board slot.
·On DXP Plus systems the loop start line boards connect to any universal slot.
NOTE: On DXP Plus systems, do not install a line board at the right-most board slot in the second (or lower)
expansion cabinet. The system reserves this slot for internal use.
5. If you are installing the line 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 line board.
6. Orient the circuit 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.
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.
7. Repeat steps 3 and 4 until all circuit boards are installed.
8. Make a final inspection to ensure that all circuit boards are, oriented correctly and mated properly.
9. Install and tighten the supplied screws to secure the circuit boards to the board cage.
10. Each line board includes a ferrite collar. Bundle the line cables together and snap the ferrite collar around the
cable bundle to provide protection against radio frequency interference.
IMI89–172 Installing The Loop Start Line Board
4 – Installing The Loop Start Line Board