Comdial Dxp Plus Instructions Manual

							1.2 Detailing E&M Signalling Methods
The multipurpose line board provides two wires for a tip and ring voice circuit and two wires (the E and M line)
to provide control signalling between the systems. When a local DXPPlusputs a request for service from the
remote equipment on the M lead, the remote equipment detects this request on its E lead. As an option it can also
respond by putting an alerting signal on its M lead.
NOTE: Intercom feature codes of one DXP Plus are not available to callers from the other DXP Plus nor can
those callers access a line through the distant DXP Plus using line group access codes.
The DXPPlussupports two different types of E and M lines. TheE and M Directtype is for direct connection
between two telephone systems and is also known as a metallic connection. TheE and M Carriertype is for tie
lines that run through a central office (CO) interface; however, some COs also provide a metallic connection
interface.
If you plan to use tone dial configured E and M lines with the multipurpose line board, you may need to install
one or more DTMF receiver cards to the DXPPlus. Typically, you will need one DTMF receiver for every six
lines. In high traffic situations, you may need additional DTMF receivers. For information on DTMF receiver
card installation, see IMI89–186,Installing A DTMF Receiver In The DXP Plus Digital Communications System.
NOTE: The DTMF receiver cards that you add for this purpose are in addition to any you may add to the system
to support industry-standard telephone station boards
You can program the system to respond to three different standard-protocol types of E and M signalling. They are
known as: immediate signalling, wink signalling, and delayed signalling and are defined in the following
paragraphs.
Immediate Signalling:With this signalling method, the called DXPPlusanswers as soon as the calling DXP
Plusinitiates the call. There is no delay between calling and answering. This signalling method is usually used if
the line is programmed for hot line operation or is programmed for pulse dialing.
Wink Signalling: With this signalling method, the called DXPPlusplaces a momentary signal reversal (wink) on
its M lead to alert the calling DXPPlussystem that it is ready to receive information. The calling DXPPlus
controls the status of the M lead and watches for a return signal from the called DXPPluson the E lead.  A wink
occurs when the called DXPPlusis ready to receive dialed digits from the calling DXPPlus. Dialing can begin
only after the wink is complete. After the wink occurs, the called DXPPlus(if it is programmed for dialing)
returns dial tone to the calling DXPPlusas an indication it is ready to receive digits.  This signalling method is
the preferred protocol for use between two DXPPlussystems.
Delayed Signalling: With delay dial signalling, the called DXPPlusimmediately responds to the calling DXP
Plusby sending an off-hook signal on its M lead. It holds this off-hook condition until it is ready to receive digits
and then returns its M lead to on-hook. After the signal exchange occurs, the called DXPPlus(if it is
programmed for dialing) returns dial tone to the calling DXPPlusas an indication it is ready to receive digits.
This signalling method is an alternate to wink start signalling that also provides equipment readiness signals.  This
method is most useful if the DXPPlusis connected to another manufacturer’s PBX with incompatible wink
timing parameters.
In addition to the standard-protocol signalling, you can program the system to respond to two types of
non-standard tie line signalling protocols. They are known as: hot line and intercom dialing and are defined in the
following paragraphs.
Hot Line: You can program the system for hot-line operation so that as soon as a user accesses the tie line, the
station or stations at the distant system that have access to the personal or group intercom assigned to the hot line
will ring.
Intercom Dialing: Alternately, you can program the system for intercom dialing mode so that as soon as users
access the tie line they will hear dial tone. Upon hearing dial tone, they can dial either a personal or group
intercom number at the distant system.
IMI89–192 Installing The Multipurpose Line Board
2 – Installing The Multipurpose Line Board 
						

							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.
Backboard
Earth
Ground 1 Meg Ohm
Resister Conductive
MatStatic Discharge
Wrist Stap Common
Equipment
Cabinet
PLUS034
Providing Static Protection At The Cabinet
Mounting Location
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
Installing The Multipurpose Line Board IMI89–192
Installing The Multipurpose Line Board – 3 
						

							2.2 Installing Multipurpose 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
multipurpose 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 6, 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
3. Loosen the retaining hardware and lift the front panel away from the common equipment cabinet.
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.
4. Each multipurpose line board is supplied in a static protection bag for safe keeping. When you are ready to
install the board, remove it from its static protection bag.
5. Locate the proper board slot.
·On DXPPlussystems the multipurpose line boards connect to any universal slot.
NOTE: On DXP Plus systems, do not install a multipurpose line board at the right-most board slot in the second
(or lower) expansion cabinet. The system reserves this slot for internal use.
6. 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.
7. Orient the multipurpose line 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 handset cord between pre-charge port on DXPPluspower supply and jack on multipurpose line
board (as directed in step 6), disconnect it after installing 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 multipurpose line boards are installed.
9. Make a final inspection to ensure that all boards are, oriented correctly and mated properly.
10. Install and tighten the supplied screws to secure the circuit boards to the board cage.Do not neglect this step!
It is important because it helps in providing a protective ground condition for the board and ensures
proper functioning of E and M and ground-start lines.
IMI89–192 Installing The Multipurpose Line Board
4 – Installing The Multipurpose Line Board 
						

							Installing The Multipurpose Line Board
Static Discharge Wrist StrapPower Supply
Pre-charge Port
Multipurpose
Line Board Pre-charge
Port Pre-charge
Cable For
Board
Installation
During
Power Up
PLUS054
Installing The Multipurpose Line Board IMI89–192
Installing The Multipurpose Line Board – 5 
						

							3.0 Connecting The Multipurpose Lines
The FCC specified jack configuration for the multipurpose board line connections to the switched network is the
(USOC)RJ2EXtype and the facility interface code isTL11M. This specified connection is typically a type
66M-nn connector block.
CAUTION
When connecting the lines for multipurpose applications, be sure that you do not reverse the tip and ring
leads.
A 50-pin connector on the multipurpose line board provides its line terminations. You can cable connect the
multipurpose board to the CO line termination with a prepared cable that matches the termination requirements.
Snap the supplied ferrite collar around the cable to provide protection against radio frequency interference.
Before you connect the CO-supplied multipurpose lines to the board, program the system for proper operation.
1. Replace the front panel on the common equipment cabinet.
2. Plug the AC line cord into the AC outlet, reconnect any battery back up equipment and turn on the switch on
the power supply.
3. Connect the CO-supplied lines to the multipurpose board. The system will test each circuit for loop current
after you connect the lines to the board. If the multipurpose line board does not detect loop current for a line
(in either loop or ground start applications), it will ignore this line and show an idle condition on its status
light. If this happens, you must check the line connections for proper wiring.
4. Note the multipurpose board’s status light, and compare status with the following details:
Rapid Flash= Malfunctioning on-board processor,
Off with repeated 5 second blink on= Normal operation with all idle lines,
On with repeated 5 second blink off= Normal operation with at least one busy line, (lf a line is active but
the LED is showing off with repeated 5 second blink on, check the wiring for poor connections),
Three Rapid Flashes On Followed By 2.5 seconds Off= One or more lines out of service
NOTE: If the system operation includes the direct inward station access (DISA) feature on a particular line,
callers that use DISA to access a trunk group and place calls (trunk to trunk calling) may experience low
audio levels on their calls due to the normal line resistance of CO lines. Low audio level is usually only
noticeable on long line loops. If signal loss is a problem at your site, try adding a line amplifier (repeater)
in the DISA line. Comdial does not recommend DISA for use on loop start lines without disconnect
supervision. While DISA will function, Comdial will not be liable for its performance under any condition
where disconnect supervision is not provided.
3.1 Installing E&M Lines
When you install E&M tie lines to connect the DXPPlusto a remote telephone system, you must follow the
particular wiring arrangement detailed in the following chart.  From the chart, notice that line 3 of one system
connects to line 4 of the other system and that the E lead of one line connects to the M lead of the other line.
Local DXP Plus Remote DXP Plus
Line 3 Tip Line 4 Tip
Line 3 Ring Line 4 Ring
Line 3 E Line 4 M
Line 3 M Line 4 E
Line 4 Tip Line 3 Tip
Line 4 Ring Line 3 Ring
Line 4 E Line 3 M
Line 4 M Line 3 E
IMI89–192 Installing The Multipurpose Line Board
6 – Installing The Multipurpose Line Board 
						

							Viewing Typical Multipurpose Line Connections
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
CLIP TERMINALS
{{ { {
{{ { {
{
{
{ {
Connector BlockTypical Earth GroundNo. 6 Solid
Copper WireGrounding
Terminal
Ferrite
Collar Male 50-pin
Connector Multipurpose
Line Board
Line 1
Line 2
Line 3
Line 4
Line 5
Line 6
Line 7
Line 8
Line 2
Line 1 Line 3
Line 4Loop Start and Ground Start
Loop Start and Ground Start
Loop Start, Gnd Start, and E&M Voice
Loop Start, Gnd Start, and E&M Voice
Loop Start and Ground Start
Loop Start and Ground Start
Loop Start and Ground Start
Loop Start and Ground Start
E&M Control For Line 3
E&M Control For Line 4
Auxiliary Equipment Interface
Power Fail Station
PLUS055
Installing The Multipurpose Line Board IMI89–192
Installing The Multipurpose Line Board – 7 
						

							3.1 Understanding The DXP Plus Logical Numbering
Because there are no dedicated station or line ports in the DXPPlus, 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.
IMI89–192 Installing The Multipurpose Line Board
8 – Installing The Multipurpose Line Board 
						

							3.2 Understanding The Multipurpose Line Connections
25-Pair Connections Wire-Pair
ConnectionsLine
NumberLine Type
Wire Color PairPin
No.Clip
Term.Wire
Name
White-Blue
126 1 Tip
1Loop Start and Ground Start
Blue-White 1 2 Ring
White-Orange
227 3 Tip
2Loop Start and Ground Start
Orange-White 2 4 Ring
White-Green
328 5 Tip
3Loop Start, Ground Start,
and E&M Voice
Green-White 3 6 Ring
White-Brown
429 7 Tip
4Loop Start, Ground Start,
and E&M Voice
Brown-White 4 8 Ring
White-Slate
530 9 Tip
5Loop Start and Ground Start
Slate-White 5 10 Ring
Red-Blue
631 11 Tip
6Loop Start and Ground Start
Blue-Red 6 12 Ring
Red-Orange
732 13 Tip
7Loop Start and Ground Start
Orange-Red 7 14 Ring
Red-Green
833 15 Tip
8Loop Start and Ground Start
Green-Red 8 16 Ring
Red-Brown
934 17
Brown-Red 9 18
Red-Slate
1035 19
Slate-Red 10 20
Black-Blue
1136 21
Blue-Black 11 22
Black-Orange
1237 23
Orange-Black 12 24
Black-Green
1338 25 M
3E&M Control for Line 3
Green-Black 13 26 E
Black-Brown
1439 27 M
4E&M Control for Line 4
Brown-Black 14 28 E
Black-Slate
1540 29
Slate-Black 15 30
Yellow-Blue
1641 31
Blue-Yellow 16 32
Yellow-Orange
1742 33
Orange-Yellow 17 34
Yellow-Green
1843 35
Green-Yellow 18 36
Yellow-Brown
1944 37
Brown-Yellow 19 38
Yellow-Slate
2045 39
Slate-Yellow 20 40
Violet-Blue
2146 41
Blue-Violet 21 42
Violet-Orange
2247 43
Orange-Violet 22 44
Violet-Green
2348 45
Green-Violet 23 46
Violet-Brown
2449 47 Tip
2Auxiliary Equipment
Interface (Busy Lead Detect)
Brown-Violet 24 48 Ring
Violet-Slate
2550 49 Tip
1Power Fail Station
Slate-Violet 25 50 Ring
Installing The Multipurpose Line Board IMI89–192
Installing The Multipurpose Line Board – 9 
						

							4.0 Understanding Installer/User Information
Regarding FCC Rules And Regulations
This DXPPlusdigital communications system complies with Federal Communications Commission (FCC)
Rules, Part 68. The FCC registration label on the KSU 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 electronic key 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 is a type RJ21X.
IMI89–192 Installing The Multipurpose Line Board
10 – Installing The Multipurpose Line Board 
						

							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.
Radio Frequency Interference
The electronic key 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 KSU, 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 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.
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. Le présent appareil numérique n’émet pes de bruits radioélectriques dépassant les limites applicables aux appareils
numériques (de la class A) prescrites dans le Réglement sur le brouillage radioélectrique édicté par le ministére
des Communications du Canada.
Installing The Multipurpose Line Board IMI89–192
Installing The Multipurpose Line Board – 11