Comdial Dxp Plus Instructions Manual

							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 DID Line Board IMI89–191
Installing The DID Line Board – 5 
						

							2.2 Installing DID Line Boards
1. Normally you should first disconnect the optional battery back-up assembly from the main cabinet power
supply and then disconnect the AC power cord from the AC outlet; however, when necessary, you can install
a DID 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 DID 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 DID line boards connect to any universal slot.
NOTE: On DXP Plus systems, do not install a DID 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 DID 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 DID 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 DID 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.
IMI89–191 Installing The DID Line Board
6 – Installing The DID Line Board 
						

							Installing The DID Line Board
Static Discharge Wrist StrapPower Supply
Pre-charge Port
DID Line Board Pre-charge
Port Pre-charge
Cable For
DID Board
Installation
During
Power Up
PLUS021
Installing The DID Line Board IMI89–191
Installing The DID Line Board – 7 
						

							3.0 Connecting The DID Lines
The FCC specified jack configuration for DID line connection to the switched network is a universal service order
code (USOC) RJ21X type and the facility interface code for DID is02RV2-T. This specified connection is
typically a type 66M-nn connector block.
CAUTION
When connecting the lines for DID applications, be sure that you do not reverse the tip and ring leads.
A 50-pin connector on the DID line board provides its line terminations. You can cable connect the DID 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 DID lines to the board, program the system for DID operation, and test the
DID line ports per the steps shown below.
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. Using the data base programming procedure, program the system for DID line operation.
4. Connect a buttset or an industry-standard telephone (IST) to a line port on the DID line board.
5. Take the buttset or ISToff-hook, and listen for relay click on both wink start and delay start lines.
6. Dial a CO digit string to determine if you can make a call. Have someone answer your call to determine if
you have a complete talk path.  If you can complete a call, this verifies that you have programmed the system
correctly.
7. Repeat step 6 as desired for other CO digit strings and repeat steps 4 through 7 at all line ports on the DID line
board.
8. Connect the CO-supplied DID lines to the DID board.
9. Note the DID 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
IMI89–191 Installing The DID Line Board
8 – Installing The DID Line Board 
						

							Viewing Typical DID Line Connections
NOTE: Wiring for the 8 line board is shown. Wiring for the 4 line board uses only pairs 1 through 4.
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
50
26
1 25
{{ { {
{{ { {
Connector Block
Typical Earth GroundNo. 6 Solid
Copper WireGrounding
Terminal
Ferrite
Collar Male 50-pin
ConnectorDID
Line Board Line 1
Line 2
Line 3
Line 4
Line 5
Line 6
Line 7
Line 8
PLUS022
Installing The DID Line Board IMI89–191
Installing The DID Line Board – 9 
						

							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.
IMI89–191 Installing The DID Line Board
10 – Installing The DID Line Board 
						

							3.2 Understanding The DID Line Connections
25-Pair Connections Wire-Pair
ConnectionsLine Designations
Wire Color Pair Pin
No.Clip
Term.Wire Name Line Number CO Line
Number
White-Blue 1 26 1 Tip
1
Blue-White 1 2 Ring
White-Orange 2 27 3 Tip
2
Orange-White 2 4 Ring
White-Green 3 28 5 Tip
3
Green-White 3 6 Ring
White-Brown 4 29 7 Tip
4
Brown-White 4 8 Ring
White-Slate 5 30 9 Tip
5
Slate-White 5 10 Ring
Red-Blue 6 31 11 Tip
6
Blue-Red 6 12 Ring
Red-Orange 7 32 13 Tip
7
Orange-Red 7 14 Ring
Red-Green 8 33 15 Tip
8
Green-Red 8 16 Ring
Red-Brown 9 34 17
Brown-Red 9 18 Red
Red-Slate 10 35 19 Data Path Yellow
Slate-Red 10 20 Black
Black-Blue 11 36 21 Voice Path Green
Blue-Black 11 22 Red
Black-Orange 12 37 23 Data Path Yellow
Orange-Black 12 24 Black
Black-Green 13 38 25 Voice Path Green
Green-Black 13 26 Red
Black-Brown 14 39 27 Data Path Yellow
Brown-Black 14 28 Black
Black-Slate 15 40 29 Voice Path Green
Slate-Black 15 30 Red
Yellow-Blue 16 41 31 Data Path Yellow
Blue-Yellow 16 32 Black
Yellow-Orange 17 42 33
Orange-Yellow 17 34
Yellow-Green 18 43 35
Green-Yellow 18 36
Yellow-Brown 19 44 37
Brown-Yellow 19 38
Yellow-Slate 20 45 39
Slate-Yellow 20 40
Violet-Blue 21 46 41
Blue-Violet 21 42
Violet-Orange 22 47 43
Orange-Violet 22 44
Violet-Green 23 48 45
Green-Violet 23 46
Violet-Brown 24 49 47
Brown-Violet 24 48
Violet-Slate 25 50 49
Slate-Violet 25 50
NOTE: Wiring for the eight-line board is shown. Wiring for the
four-line board uses only pairs 1 through 4.
Installing The DID Line Board IMI89–191
Installing The DID Line Board – 11 
						

							4.0 Understanding The Federal Communications
Requirements Concerning DID Lines
The Federal Communications Commission (FCC) requires that you inform the central office (CO) that the DXP
Plusis configured as an MF (multipurpose) registered device if you connect it to ground start DID lines. Also,
FCC rules, part 68, require customer premise equipment (CPE) to return answer supervision signalling to the CO
for DID calls. Allowing the DXPPlusto be operated in a manner that does not provide answer supervision is a
violation of these rules. In compliance to this ruling, the DXPPlussystem returns DID answer supervision no
later than 500 milliseconds after the incoming call is serviced. The regulations require that the system return this
answer supervision whenever the following DID call conditions exist:
·call answered by the called station,
·call answered by the attendant,
·call routed to a recorded announcement that can be administered by a system user,
Exceptions to the requirement are when:
·a call is not answered,
·a busy tone is received,
·a reorder tone is received.
4.1 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.
IMI89–191 Installing The DID Line Board
12 – Installing The DID 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 DID Line Board IMI89–191
Installing The DID Line Board – 13 
						

							Installing The Multipurpose Line Board
In The DXP Plus Digital Communications System
1.0 Understanding The Multipurpose Line Board
The Multipurpose line board for the DXP Plus digital communications system provides system interface for
ground start lines, loop start lines, and E&M (tie) lines.  These are typically the three different line types that the
central office (CO) makes available for connection to the public switched network. The multipurpose line board is
fully programmable for each type of line.
1.1 Detailing The Line Types
Loop Start Lines:  With this line type, the DXP Plus bridges a resistance across the tip and ring leads to signal the
CO to establish a communications link for an outgoing call. The CO detects the resulting current flow and
supplies dial tone to the DXP Plus. The CO signals an incoming call to the DXP Plus by placing an alternating
voltage (ring signal) on the tip lead for the DXP Plus to sense. The DXP Plus then generates ringing to the DXP
Plus station being called. When a station answers the ringing, the circuit is completed as it was for outgoing calls.
Loop start lines can not provide any sure means of determining when a distant party hangs up his or her telephone.
For a system that experiences moderate incoming and outgoing call volume and does not cost calls, loop start
lines provide an economical choice for connecting the DXP Plus to the central office (CO) equipment. When you
use line 1 for the power-fail mode, you must program that line to be a loop-start line unless the industry-standard
telephone that you use as a power-fail station is a ground-start device.
Ground Start Lines: With this line type, the DXP Plus momentarily grounds the ring lead to signal the CO to
establish a communications link for an outgoing call. When the CO detects this, it acknowledges by momentarily
grounding the tip lead. The DXP Plus responds by removing its ground connection and bridging itself across the
tip and ring leads. The CO then removes its ground connection and returns dial tone to the DXP Plus.
For an incoming call, the CO grounds the tip lead and places an alternating voltage on the ring lead for the DXP
Plus to sense. The DXP Plus detects ring-lead ground and then causes its ring generator to generate ringing to the
station being called. When a station answers the ringing, the circuit is completed as it is for outgoing calls.
Because ground start lines are controlled at both ends, they are capable of release supervision that provides a sure
means of determining when a distant party hangs up his or her telephone. This is very important in applications
where calls are costed. Also, since the signalling protocol indicates which end requested the line, it helps prevent
call collisions and glare and thus is useful in applications where there is a high volume of incoming and outgoing
calls occurring on the same lines. Ground start lines are standard protocol for remote networking and are useful
for connecting the DXP Plus to private branch exchange (PBX) equipment. For ground start lines to be
dependable, you must ensure that you have connected the DXP Plus to a low resistance telephone company
ground.
NOTE: The Federal Communications Commission (FCC) requires that you inform the central office that the DXP
Plus is configured as an MF (multipurpose) registered device if you connect it to ground start lines.
E&M Tie Lines: The tie line connections (also known as tie trunk access) are special circuits that allow, on a
dial-up or continuous connection (hot line) basis, the DXP Plus to communicate with remotely located equipment
such as: another DXP Plus, a PBX, or to other common carrier (OCC) equipment for long distance calls. Tie lines
can be a part of a private or leased network and can be metallic, carrier current, T1, or microwave.
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.IMI89-192.01
7/95