Comdial Dxp Plus Instructions Manual

							5.0 Testing The Analog Station Installation
5.1 Making A Resistance Check
Make the following resistance measurements at the station connector blocks under the following conditions.
·AC power cord disconnected from electrical outlet.
·External battery back-up assembly disconnected.
·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.
1. 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 limits shown in the
chart below.
2. Measure the resistance of the common equipment and cables from the common equipment side of the station
connector blocks. Resistance values should be within the limits shown in the chart below.
Making Resistance Measurements
Measured PairResistance In Ohms
Multiline Telephone Single Line Telephone DSS/BLF Console Common Equipment
Voice Pair 40–150 40–150 0.3–100 40–50
Data Pair 0.3–100 0.3–100 0.3–100 1–2
5.2 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 one voice line and one data line and then across the other voice line and the other data
line for each even and odd station. The measured voltage must be within the limits shown in the chart below.
Making Voltage Measurements
Station Under Test 66M-xx Block Connection Meter Lead Polarity Measured Voltage
Odd StationVoice 1 +
+ 34 +/- 3 VDC
Data 3 -
Voice 2 +
+ 34 +/- 3 VDC
Data 4 -
Even StationVoice 5 +
+ 34 +/- 3 VDC
Data 7 -
Voice 6 +
+ 34 +/- 3 VDC
Data 8 -
Varriant readings can indicate a possible wiring, station, or common equipment problem.
IMI89–173 Installing The Analog Station Board
14 – Installing The Analog Station Board 
						

							5.3 Causing An Analog Station To Self Test
You can cause analog multiline stations to self test for proper operation per the following instructions:
1. Disconnect line cord at station base.
NOTE: The adjacent odd or even station will be disabled during the time that the station line cord is being
disconnected or reconnected.
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.) Indicators will then turn off at the same time
(c.) Ringer will sound—be sure to set station ringer volume to medium or high setting
4. Replace any station that does not pass the self test.
5.4 Causing A DSS/BLF Console To Self Test
You can cause the DSS/BLF Consoles to self test for proper operation as follows:
1. Disconnect console line cord plug from line.
2. Press and hold console button C10 while reconnecting line cord plug to line.
NOTE: The companion station will be disabled during the time that the console is being disconnected and
reconnected.
3. Release console button C10, and note that BLF indicators will each turn on in sequence beginning with
station 10 indicator. Indicators will then turn off and console will become operational.
5.5 Understanding The Failure Indications
If erratic light indications or ring signals occur at a paired station, an open data pair at either station may be the
fault. A station with an open data line may work properly on a short loop but fail on a long loop.
Stations are paired for overload current protection. If a fault occurs that causes more than 300 milliamps of
current to be drawn, the overload paired stations are disabled by circuit action. Disconnect the disabled stations
and reconnect them one at a time to isolate the faulty one.
Installing The Analog Station Board IMI89–173
Installing The Analog Station Board – 15 
						

							Installing The Digital Station Board
In The DXP Plus Digital Communications System
1.0 Introducing The Digital Station Boards
The digital station board supports the operation of both the DigiTech and Impact digital multiline telephones.
1.1 Inventorying The Digital Station Boards
There are two models of station boards available for use.
·Eight-station model supports eight DigiTech or Impact multiline and single line proprietary digital telephones
·16-station model supports 16 DigiTech or Impact multiline and single line proprietary digital telephones
1.2 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.
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.IMI89-174.01
7/95 
						

							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.
IMI89–174 Installing The Digital Station Board
2 – Installing The Digital 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 Digital Station Board IMI89–174
Installing The Digital Station Board – 3 
						

							2.2 Installing Station Boards In The Equipment Cabinet
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 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. 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.
4. Locate the proper board slot.
·On DXPPlussystems the station boards connect to any universal slot.
NOTE: On DXPPlussystems, do not install a station 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 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.
6. 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.
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 station board includes a ferrite collar. Snap the ferrite collar around the cable station to provide
protection against radio frequency interference.
IMI89–174 Installing The Digital Station Board
4 – Installing The Digital Station Board 
						

							Viewing A Typical Station Board Installation
Static Discharge Wrist StrapPower Supply
Pre-charge Port
Analog or Digital
Station Board Station Board
Pre-charge
Port Pre-charge
Cable For
Station Board
Installation
During
Power Up
PLUS029
Installing The Digital Station Board IMI89–174
Installing The Digital Station Board – 5 
						

							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 American Wire Gauge (AWG) size of the station wiring determines the maximum distance allowed from the
common equipment to the stations. The following chart details this relationship.
Station Type Wire Gauge
20 AWG 22 AWG 24 AWG
Digital Telephone 2500 Feet 2000 Feet 1500 Feet
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.
3.1 Installing DSS/BLF Consoles
Install a DSS/BLF Console at any station port in the system as a companion to a system telephone.
·The DXPPlussystems support a maximum of four consoles for each telephone and there is no limit to the
maximum number of consoles that you can install on a system.  Typically, the console capacity is equal to
one-half of the total station capacity of the system.
·The installed distance limit between the station board and the console is the same as that allowed for an analog
or digital telephone.
When you install a DSS/BLF console, you must program define the station port as a console port.
IMI89–174 Installing The Digital Station Board
6 – Installing The Digital Station Board 
						

							Viewing A Typical Station Connection
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
Typical Station
Connector Block
Ferrite
Collar Female 50-pin
Cable Connector
J1 (Male 50-pin
Connector) Typical Digital
Station Board
PLUS068
Installing The Digital Station Board IMI89–174
Installing The Digital Station Board – 7 
						

							3.2 Detailing The Station Connections
3.2.1 Detailing Digital Station Board Connections
25-Pair Connections Station Pair Connections Station Identification
Wire Color PairPin
No.Clip
Term.Pair Identification Wire Color StationLocation(note the site
position in this column)
White-Blue
126 1
Signal PathGreen
1
Blue-White 1 2 Red
White-Orange
227 3
Signal PathYellow
2
Orange-White 2 4 Black
White-Green
328 5
Signal PathGreen
3
Green-White 3 6 Red
White-Brown
429 7
Signal PathYellow
4
Brown-White 4 8 Black
White-Slate
530 9
Signal PathGreen
5
Slate-White 5 10 Red
Red-Blue
631 11
Signal PathYellow
6
Blue-Red 6 12 Black
Red-Orange
732 13
Signal PathGreen
7
Orange-Red 7 14 Red
Red-Green
833 15
Signal PathYellow
8
Green-Red 8 16 Black
Red-Brown
934 17
Signal PathGreen
9
Brown-Red 9 18 Red
Red-Slate
1035 19
Signal PathYellow
10
Slate-Red 10 20 Black
Black-Blue
1136 21
Signal PathGreen
11
Blue-Black 11 22 Red
Black-Orange
1237 23
Signal PathYellow
12
Orange-Black 12 24 Black
Black-Green
1338 25
Signal PathGreen
13
Green-Black 13 26 Red
Black-Brown
1439 27
Signal PathYellow
14
Brown-Black 14 28 Black
Black-Slate
1540 29
Signal PathRed
15
Slate-Black 15 30 Green
Yellow-Blue
1641 31
Signal PathYellow
16
Blue-Yellow 16 32 Black
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
Brown-Violet 24 48
Violet-Slate
2550 49
Slate-Violet 25 50
The digital station board does not provide station connections on connector
pairs 17–25. Remember, you should connect all unused conductors in your
house cable to earth ground.
IMI89–174 Installing The Digital Station Board
8 – Installing The Digital Station Board